Companies Using Calendly in London: 786 Active Firms (2026)
Companies running appointment-scheduling technology use web-based booking flows to arrange sales calls, consultations and service meetings in London.
Appointment-scheduling tools sit close to revenue operations, customer success and service delivery rather than core production systems. Public booking links, embedded calendars and routing rules let prospects choose a time, pass basic context and enter a managed follow-up process. Adoption tends to signal a company with enough inbound demand to benefit from self-serve meeting capture, but not necessarily a large sales operation. The fit is clearest in B2B software, professional services, education, recruitment, financial services and healthcare-adjacent services, where consultations, demos and account meetings are repeatable commercial events.
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London has 786 actively trading companies running this appointment-scheduling technology. Reported employment covers 119 firms and totals 2,548 staff, which points to a cohort weighted towards smaller operators rather than large employers. The median headcount is 7 and median turnover is about £496,000, while 35 firms report turnover above £5M. Sector tags cluster around SaaS at 22.8%, education and training at 10.8%, IT services and managed services at 10.2%, and AI and machine learning at 9.8%, with tags overlapping across sales-led and knowledge-service models.
Booking flows usually collect names, email addresses, meeting details and other identifiers, so UK GDPR and the Data Protection Act 2018 sit close to day-to-day use. The ICO treats personal data as information relating to an identified or identifiable natural person, including names, location data and online identifiers. If embedded scheduling forms, analytics or related widgets place cookies, PECR requires clear notice, an explanation of purpose and consent unless the cookie is strictly necessary for a user-requested service. Follow-up emails also need to be handled with PECR in mind.
Adoption appears to be moving from simple calendar embeds towards managed routing, consent capture and attribution inside sales and service workflows. Smaller firms tend to value low-administration booking because it reduces manual coordination, while more mature teams are likely to scrutinise privacy controls, audit trails and how meeting data moves into customer systems. The category has been pulled into wider sales, website and customer-management bundles, so standalone use may persist where teams want a narrow tool, but procurement pressure favours better-governed stacks.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
Adoption by company size
Adoption of Calendly rises with company size across the trading companies in this cohort. 0.1% of the 532,485 companies with under 10 employees run Calendly (509 detected). 1.5% of the 15,364 companies with 10–50 employees run Calendly (236 detected). 1.3% of the 1,763 companies with over 50 employees run Calendly (23 detected). That is a 1.2% gap between the over 50 employees and under 10 employees bands.
786
Active firms
2026
35
Above £5M turnover
Trading firms
7
Median headcount
Filed accounts
1,580
Verified directors
Across this cohort
Top companies using Calendly in London
Ranked by sales-readiness score: an AI model assesses what each company does, its sector and size, and scores its overall fit. Best-fit prospects appear first.
Financial sub-scores
Computed from 5 filingsProvides private general practice services including virtual GP video consultations, in‑clinic and home visit appointments, medical referrals, sick notes, prescriptions, and blood tests, alongside…
Serves private healthcare patients in the UK, including adults seeking online GP appointments, in-clinic consultations, home or hotel visits, diagnostics, referrals, sick notes, and men’s or women’s…
Financial Health
StrongStrong · Growing, Hiring · 78% CAGR over 4y
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Computed from 5 filingsProvides accounting and finance services for businesses, including cloud-based bookkeeping and accounting, outsourced finance function and CFO support, R&D tax credit and SEIS/EIS investment advice,…
Serves owner-managed and growing UK businesses, particularly SaaS/subscription companies, eCommerce firms, startups and professional services organisations.
Financial Health
StrongStrong · Growing, Hiring · 14% CAGR over 4y
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Computed from 5 filingsProvides accounting software combined with accountant support for small businesses. Platform automates bookkeeping, categorises transactions, generates financial insights, manages invoices and…
Sells to UK small business owners needing accounting, bookkeeping and tax support. Targets business customers that want an all-in-one finance solution, including firms switching from another…
Financial Health
StrongStrong · Growing, Hiring · 81% CAGR over 4y
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Computed from 5 filingsOperates an outpatient gynaecology and fertility clinic providing fertility assessments and treatments including IVF, ICSI, IUI, egg freezing, ovulation induction, genetic testing, and donor…
Serves private patients in London seeking fertility and gynaecology support, including couples, single women, LGBTQ+ families, people preserving fertility, and patients with male or female…
Financial Health
HealthyHealthy · Hiring · 21% CAGR over 4y
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Computed from 3 filingsDevelops sales enablement and customer onboarding software. Provides digital sales room workspaces where sales teams share content, proposals, quotes and action plans with buyers, track engagement…
Serves B2B revenue teams, including BDR/SDR teams, account executives, customer success, account management, CROs and partnerships managers involved in sales, onboarding, account management and…
Financial Health
StrongStrong · Growing, Hiring · 78% CAGR over 2y
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Computed from 3 filingsDevelops software that enables retailers and ecommerce brands to sell products on pre-order before inventory arrives. The platform integrates with existing commerce systems to manage pre-order sales,…
Serves B2B ecommerce and retail brands selling physical goods, targeting executives, warehouse and operations teams, merchandising, customer experience, and ecommerce/technology teams.
Financial Health
StrongStrong · Growing, Hiring · 23% CAGR over 2y
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Computed from 5 filingsProvides accounting, tax compliance and business advisory services for technology and fintech startups. Advises on R&D tax credits, EIS/SEIS and EMI schemes, financial reporting, cap table…
Serves B2B tech, fintech and digital start-ups, including London-based growth companies and global start-ups expanding into the UK, typically founders seeking finance and tax support from launch…
Financial Health
StrongStrong · Growing, Hiring · 14% CAGR over 4y
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Computed from 3 filingsDevelops cloud and PC-based estimating and take-off software for contractors. Tools support quantity surveying, cost estimation, and proposal preparation using digital drawings and material…
Sells to small businesses and commercial contractors, especially mechanical, electrical, M&E/MEP, ductwork and insulation contractors, plus estimators and quantity surveyors.
Financial Health
StrongStrong · Growing, Hiring · 5% CAGR over 2y
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Computed from 3 filingsProvides account-based marketing services for enterprise clients including 1:1 and 1:few campaigns, demand and lead generation, account selection, marketing technology integration, sales enablement,…
Serves B2B mid-market and enterprise sales and marketing teams, especially in industrial manufacturing, technology, SaaS, cybersecurity, medical/pharmaceutical and financial services sectors.
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StrongStrong · Growing · 0% CAGR over 2y
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Computed from 5 filingsDevelops and provides cloud-based workforce management software for hourly workforces, including employee scheduling, shift planning, time and attendance tracking, payroll processing, HR records,…
Serves B2B organisations with hourly workforces, especially restaurants, hospitality, hotels, retail and social care, targeting HR, operations, finance, payroll teams, and business owners or…
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StrongStrong · Growing, Hiring · 14% CAGR over 4y
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Computed from 5 filingsProvides email and SMS marketing services for e‑commerce brands, focusing on customer retention and revenue growth. Develops campaign strategies, automated flows, and lead generation systems, and…
Serves B2B clients: fast-growth direct-to-consumer ecommerce brands, including online retailers with customer retention and lifecycle marketing teams, particularly Klaviyo users.
Financial Health
StrongStrong · Hiring · 41% CAGR over 5y
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Computed from 5 filingsProvides flexible funding products for small and medium-sized businesses, including revolving credit facilities and debt consolidation lines. Offers tools and resources such as performance…
Serves UK SMEs and founders of growing businesses, with partner channels and introducers also addressed for referrals and business support.
Financial Health
StrongStrong · Growing, Hiring · 43% CAGR over 4y
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Computed from 5 filingsProvides digital marketing services including campaign strategy, paid advertising management, customer acquisition and lead generation. Uses data analysis, testing and optimisation to design and…
Serves businesses, especially scale-ups seeking digital marketing support. Targets founders, marketing directors and teams that want customer acquisition, lead generation and sales growth, likely…
Financial Health
StrongStrong · Hiring · 26% CAGR over 4y
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Computed from 5 filingsProvides accountancy and tax advisory services for businesses, including bookkeeping, financial reporting, tax planning, and business performance analysis. Offers structured service plans and…
Serves B2B customers: business owners, startups and growing SMEs choosing starter, active or established plans, across varied industries, with messaging aimed at people responsible for their…
Financial Health
StrongStrong · Hiring · 19% CAGR over 4y
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Computed from 5 filingsOperates an online platform for discovering and booking local activities such as sports clubs, forest schools, craft classes and adult education, and provides booking and management software for…
Serves families and adults seeking local activities, alongside clubs, class providers, forest schools, educators, schools, colleges and councils managing HAF, SEND short breaks and wraparound…
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HealthyHealthy · Hiring · 19% CAGR over 4y
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Computed from 2 filingsDevelops AI software tools for financial advisers, paraplanners and compliance teams. Platform automates meeting notes, suitability and review reports, document summarisation, compliance checks, and…
Sells B2B to financial advisory firms, targeting financial advisers, paraplanners and compliance teams that handle client fact-finds, suitability reports, annual reviews and compliance checks.
Financial Health
StrongStrong · Growing, Hiring · 27% CAGR over 1y
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Computed from 5 filingsProvides a business finance platform that enables companies to pay supplier invoices in instalments, access short‑term cashflow loans and credit lines, and offer flexible payment terms to customers.…
Targets B2B customers: growing businesses managing supplier bills, VAT, inventory, asset purchases, marketing spend or software costs, plus finance brokers introducing client deals and tracking…
Financial Health
StrongStrong · Growing, Hiring · 80% CAGR over 4y
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Computed from 2 filingsProvides software platform and analytics tools that measure website and application performance, identify user experience issues, and quantify revenue loss from slow pages or errors, helping product…
Sells to product, ecommerce, digital experience and site reliability teams at enterprise brands that rely on websites or apps for conversions and revenue.
Financial Health
StrongStrong · Growing, Hiring · 20% CAGR over 1y
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Computed from 3 filingsProvides accounting and tax services for small businesses, including bookkeeping, payroll, company accounts, tax returns, VAT, and financial planning. Also advises on business setup, company…
Serves small businesses, founders and business owners in London, Manchester, East London, Essex, Bolton and surrounding areas, including those starting, running or growing companies.
Financial Health
HealthyHealthy · -13% CAGR over 2y
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Computed from 5 filingsDevelops cloud-based customer relationship management (CRM) software for sales and go-to-market teams. Platform provides customizable data models, workflow automation, AI-assisted search and…
Sells to B2B companies’ go-to-market, revenue, sales and business operations teams, especially teams managing customer data, outreach, pipelines and reporting.
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StrongStrong · Growing, Hiring · 23% CAGR over 4y
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Computed from 4 filingsProvides managed IT services including cybersecurity monitoring, cloud infrastructure management, unified communications, backup and disaster recovery, and IT support. Also supplies hardware and…
Serves established businesses and schools across London and its boroughs, including organisations with remote staff and compliance, data privacy and security-focused technology requirements.
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StrongStrong
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Computed from 5 filingsDevelops digital asset management and proposal management software for architecture, engineering and construction firms. The platform organizes project images and marketing assets, and provides AI…
Serves B2B marketing, proposal and submissions teams at architecture, engineering and construction firms, from small engineering practices to larger contractors and design consultancies.
Financial Health
StrongStrong · Hiring · 9% CAGR over 5y
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Computed from 5 filingsProvides recruitment and talent acquisition services for the executive search industry, placing consultants, researchers and partners into executive search firms. Offers executive search, contingent…
Serves executive search firms, mid-sized boutiques and challenger recruitment brands, plus search professionals seeking roles across sectors such as technology, CFO, healthcare and private equity.
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StrongStrong · Growing · 0% CAGR over 4y
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Computed from 5 filingsProvides foreign exchange brokerage services for businesses, including international payments, multi‑currency accounts, and currency risk management tools such as hedging, market orders and stop…
Targets organisations with £1m-£250m annual FX exposure, particularly importers and exporters, plus corporate, private, partnership and institutional clients making regular international currency…
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HealthyHealthy · Hiring · 4% CAGR over 4y
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Computed from 4 filingsProvides UK business immigration advisory services, including sponsor licence applications, skilled worker visa processing, compliance support, and right‑to‑work guidance. Also develops HR management…
Serves UK employers, HR teams and business owners needing skilled worker sponsorship, sponsor licence and compliance support, plus overseas and UK individuals pursuing work visas or self-sponsorship.
Financial Health
StrongStrong · Growing, Hiring · 60% CAGR over 3y
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Computed from 5 filingsDevelops workforce management software for shift‑based organisations, providing tools for employee scheduling, time and attendance tracking, mobile clock‑in, payroll data export, incident reporting,…
Serves shift-based organisations with hourly workforces, including live events venues, security firms, temporary staffing agencies and fire departments, targeting shift, operations, finance and HR…
Financial Health
StrongStrong · Hiring · 7% CAGR over 4y
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Computed from 5 filingsDevelops a cloud‑native SaaS digital banking platform for fintech companies, payment institutions and e‑money providers. Provides modular APIs for digital wallets, cross‑border payments, KYC/KYB, AML…
Sells B2B to fintechs, payment service providers, e-money institutions, digital wallet providers, crypto fintech firms and digital banks, with site sections for the UK, Europe and UAE.
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
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Computed from 5 filingsOperates an online marketplace platform connecting brands with independent digital, creative and marketing agencies. Provides tools for posting briefs, matching with agencies, and managing contracts,…
Serves marketing, brand and procurement teams at large organisations and major brands seeking vetted independent digital, creative, media, PR, research and technology agencies.
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StrongStrong
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Computed from 5 filingsDevelops workforce management software for contact centres, providing demand forecasting, staff scheduling, schedule optimisation, real-time operations management, and tools for employee engagement…
Sells to enterprise contact centres and customer service operations, including high-volume organisations in travel, banking and financial services, targeting workforce management, operations and…
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HealthyHealthy · Hiring · 17% CAGR over 5y
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Computed from 5 filingsProvides product development advisory and delivery services for startups and organisations. Builds digital platforms and cloud infrastructure using modular components, and supports teams with product…
Serves B2B product and technology teams, including start-ups looking to scale and established organisations seeking to innovate, launch digital products, or build cloud-based platform capabilities.
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StrongStrong · Growing, Hiring · 46% CAGR over 4y
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Computed from 5 filingsProvides fully managed flexible office workspaces on private, self‑contained floors. Designs, fits out, leases and operates customised office environments for businesses and property owners,…
Serves businesses seeking private, fully managed office floors in London, as well as building owners, landlords and commercial property agents looking to offer flexible workspace to occupiers.
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Computed from 4 filingsProvides recruitment and executive search services focused on the cybersecurity sector, placing go‑to‑market, sales, engineering, product, and security leadership professionals for cybersecurity…
Sells to cybersecurity vendors, especially venture-backed and early-stage firms, hiring Go-To-Market, engineering, enterprise security and executive talent. Serves leadership teams and VC-backed…
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StrongStrong · Growing, Hiring · 55% CAGR over 3y
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Computed from 5 filingsProvides Salesforce consulting, development and implementation services, specialising in Experience Cloud portals and online communities. Develops Salesforce-native applications for knowledge…
Serves Salesforce-using organisations worldwide, from enterprise brands to small nonprofits, including member associations, higher education, healthcare, manufacturing, IT/high-tech and government…
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StrongStrong · Growing, Hiring · 7% CAGR over 6y
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Computed from 5 filingsProvides organisational consulting focused on growth mindset, cognitive diversity and psychological safety. Offers psychometric assessments, leadership workshops, training programmes, keynote…
Sells to organisations’ HR, L&D and leadership teams, including managers, team leaders and internal trainers; also reaches individual professionals attending public or accreditation workshops.
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StrongStrong · Growing, Hiring · 57% CAGR over 4y
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Computed from 5 filingsProvides recruitment and talent sourcing services for Web3, cryptocurrency and blockchain companies. Sources candidates for roles across DeFi, infrastructure, trading, NFTs and gaming, and publishes…
Serves both B2B and B2C in the Web3, crypto and blockchain sectors, selling to founders and hiring teams building teams, and to candidates seeking roles across DeFi, infrastructure, trading, NFTs and…
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StrongStrong · Growing, Hiring · 30% CAGR over 4y
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Computed from 3 filingsProvides an electric car salary sacrifice scheme enabling employers to offer employees leased electric or hybrid vehicles paid through pre‑tax payroll deductions. Platform includes vehicle sourcing,…
Targets employers offering employee benefits and their staff seeking electric or hybrid cars through salary sacrifice, serving businesses managing workplace benefits, payroll and employee…
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StrongStrong · Hiring · 283% CAGR over 2y
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Computed from 5 filingsProvides digital marketing services including search engine optimisation, paid search advertising, digital PR and social media marketing. Uses data and AI tools to improve brand visibility across…
Serves B2B marketing teams at consumer, ecommerce and lifestyle brands seeking external search, social and PR agency support, including organisations operating across multiple markets.
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StrongStrong · Growing, Hiring · 17% CAGR over 4y
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Computed from 5 filingsProvides cloud-based event site planning software that lets organisers design layouts on mapped locations, import floor plans, and place infrastructure such as stages, barriers, staff positions and…
Sells to B2B and public-sector event planners, including event companies, venues, festivals, local governments, sports federations, and teams managing road, sports, cultural, and community events.
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HealthyHealthy · Hiring · 55% CAGR over 4y
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Computed from 5 filingsProvides mortgage brokerage and financial advice services, arranging residential, buy-to-let, remortgage and commercial mortgage products from multiple lenders. Also advises on protection and…
Serves UK individuals and businesses seeking mortgage and protection advice, including first-time buyers, remortgagers, landlords, self-employed professionals, contractors, shared-ownership buyers…
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StrongStrong · Hiring · 19% CAGR over 4y
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Computed from 3 filingsProvides ERP consulting and implementation services for Sage X3 and Sage Intacct software. Offers system upgrades, health checks, support and recovery, helping manufacturing, distribution and service…
Serves B2B organisations using Sage ERP, especially manufacturing, process manufacturing, food and beverage, chemicals, wholesale distribution, finance and professional services firms with 20+…
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StrongStrong · Growing, Hiring · 13% CAGR over 2y
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Computed from 5 filingsOperates a platform that sources, vets and places software developers and technical specialists for companies on full‑time or freelance engagements. Also provides managed engineering teams supporting…
Targets B2B technology and product organisations, from startups to growing companies, whose engineering, product and AI teams need full-time or freelance technical talent and managed delivery…
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StrongStrong · Growing · 0% CAGR over 4y
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Computed from 4 filingsProvides intellectual property legal services, including patent drafting and filing, trademark and design protection, and IP strategy advice. Represents clients in patent oppositions and related…
Serves technology-led start-ups, growing companies and multinationals, plus entrepreneurs, technical experts, in-house counsel and US attorneys seeking UK and European IP support.
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Computed from 3 filingsProvides AI-powered website search software that indexes site content and delivers intent‑based results, AI-generated summaries, and chat responses. Also offers search analytics and tools for website…
Serves web and marketing managers at organisations with content-heavy websites, including higher education institutions, local government/public sector bodies and commercial enterprises.
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Computed from 5 filingsDevelops data analytics and software tools for public sector and social organisations, including benefits calculators, income tracking, and safeguarding data platforms. Also provides social policy…
Serves local authorities, housing providers, utilities, financial services firms, charities and public-sector policymakers, plus individuals seeking benefits support, focused on people facing…
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StrongStrong · Growing, Hiring · 17% CAGR over 4y
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Computed from 5 filingsProvides accounting and tax advisory services for technology startups, including bookkeeping, financial reporting, cash flow management, compliance, and guidance on tax reliefs and fundraising…
Serves UK high-growth tech start-ups, innovative tech ventures and founders seeking specialist accounting support during fundraising, tax planning, cash flow management and scaling.
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HealthyHealthy · Growing · 0% CAGR over 4y
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Computed from 2 filingsDevelops cloud-based no‑code software for construction and industrial companies to digitise site paperwork and operational processes, including safety management, quality tracking, field reporting,…
Serves B2B industrial and built-environment companies, including construction, engineering, infrastructure and asset-intensive firms with field, safety, quality, fleet, project delivery and…
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StrongStrong · Growing, Hiring · 91% CAGR over 1y
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Computed from 5 filingsProvides an online professional development platform for schools and multi-academy trusts, offering instructional coaching tools, video observation, feedback workflows, and analytics to support…
Serves schools and multi-academy trusts, selling to education leaders responsible for teacher professional development, coaching and training.
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StrongStrong · Growing, Hiring · 66% CAGR over 4y
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Computed from 5 filingsProvides coworking spaces, private offices and studios, and hires meeting rooms and event venues. Delivers training programmes for entrepreneurs and organisations, and offers placemaking, workspace…
Serves London-based entrepreneurs, startups, small teams and larger organisations, including creative, fashion and social-impact businesses, plus corporate teams seeking workspace, venues, training…
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HealthyHealthy · -5% CAGR over 4y
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Computed from 5 filingsProvides a digital platform for hospitality businesses to manage customer loyalty programmes, CRM and marketing communications, and to offer online ordering for delivery and click‑and‑collect through…
Serves UK hospitality businesses, especially coffee shops, bakeries, restaurants and multi-site food venues seeking loyalty, CRM, delivery, pickup and customer data tools.
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
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Computed from 5 filingsProvides technology staff augmentation and recruitment services, sourcing and employing software engineers and technical specialists globally and embedding them within client teams. Also supports…
Serves CTOs, founders and engineering teams at businesses needing to scale software development, including startups and product-led companies seeking embedded engineering talent across web, mobile,…
Financial Health
StrongStrong · Growing, Hiring · 21% CAGR over 4y
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Key facts
About 4% of the trading cohort reports turnover above £5M (35 of 786 firms) — the rest sits below that revenue band.
7% of the cohort was incorporated since 2022 (60 firms), so a sizeable share is in its first few filing cycles.
Booking flows typically process names, email addresses, meeting details and online identifiers, so UK GDPR and the Data Protection Act 2018 are relevant for London users.
Where scheduling pages, embedded widgets or related analytics use cookies or similar technologies, PECR rules require notice, explanation and consent except for cookies strictly necessary to provide a requested online service.
ONS reported that 69% of UK firms used cloud-based computing systems and applications in 2023, while 61% used specialised software.
The wider scheduling stack tends to sit alongside other web operations tools: 54.5% show tag-management technology, 53.3% content-management software, 48.7% network or security infrastructure and 48.6% analytics.
Sector tags overlap, but SaaS is the largest group at 22.8%, followed by Startup at 11.6%, Education & Training at 10.8%, IT Services & Managed Services at 10.2% and AI & Machine Learning at 9.8%.
What else do Calendly users run?
Share of the 786 Calendly-running UK companies where each technology was also detected. As of June 2026.
Who runs Calendly in the UK?
By sector
Sectors overlap, so shares need not sum to 100%.
By financial health
From filed accounts; firms with fewer than two filings show as insufficient history.
7
Median headcount
£495.6K
Median UK turnover
4.5%
Above £5M turnover
60
Incorporated since 2022
Verified directors — included in the file
Director names and roles for these 1,227 companies, alongside financials and websites, in one Excel + CSV file.
How Calendly usage is detected
Company data
Detected companies are joined to UK Companies House records and XBRL accounts data. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Detection
Firmbase crawls the public website of actively-trading UK companies and fingerprints the technologies present: tracking scripts, embedded forms, chat widgets, CMS markers and similar signatures. A company is included in this list when one or more of the technology's signatures are found on its site; closely-related variants of the same product are grouped under one name. Detection covers what is visible on the public web — a company using the technology purely internally, with no website footprint, will not appear. Counts are therefore a conservative floor, not a ceiling.
Freshness
Websites are re-crawled on a rolling basis and the underlying company data is refreshed from Companies House continuously; filings appear within days of submission. The list and its statistics are regenerated when the detected cohort moves meaningfully. You can see the last-updated timestamp near the top of the page.
Calendly is a trademark of its respective owner. Firmbase is not affiliated with, sponsored by, or endorsed by the trademark owner.
Calendly elsewhere
Frequently asked questions
How many companies in London use Calendly?
How is Calendly usage detected?
What kinds of companies use Calendly in London?
What do Calendly users in London also run?
How fresh is this data?
Can I get contact details for these companies?
Buy all 1,227 companies as a spreadsheet.
One Excel/CSV file with company details, websites and key data — yours to download and use.