Firmbase vs ZoomInfo, Apollo, Clay and Cognism

By Anna Fontanes | March 2026 | 11 min read

If you're evaluating prospecting tools for your UK B2B sales team, you've probably seen ZoomInfo, Apollo, Clay, and Cognism in your research. They're everywhere. But here's the thing: they're solving for different problems, and understanding which problem you actually have is more important than picking the "best" tool.

This isn't a cost comparison. We're not going to tell you Firmbase is cheaper (it is, but that's not why you'd switch). Instead, we're going to show you how different tools are built for different buyers - and help you figure out which one fits your team's actual workflow.

The core difference: team structure determines your tool

The biggest predictor of which prospecting tool works for you isn't your industry or company size. It's whether you have a revenue operations person.

ZoomInfo and Apollo are built for teams with RevOps. They assume someone in your organisation owns the data layer, maintains list hygiene, configures workflows, and keeps integrations running. If you have that person, these tools work well. If you don't, they become expensive, complex bottlenecks.

Clay is built for power users and engineering-minded sellers. It's incredibly flexible - you can build custom workflows, pull data from dozens of sources, and automate research at scale. But that flexibility demands technical sophistication. You need someone comfortable building schemas, debugging API calls, and maintaining automations.

Cognism has world-class contact data. If your primary problem is "I need verified email and phone numbers," Cognism solves that. But it's priced like an enterprise tool, and small teams often end up paying for more data than they actually use.

Firmbase is built for the opposite scenario: teams without RevOps, without engineering resources, without the budget for enterprise tools. You define your ideal customer profile once, and the system continuously finds accounts and surfaces the right people - without needing someone dedicated to maintaining it.

How ZoomInfo and Apollo work (and why they might not fit smaller teams)

Both ZoomInfo and Apollo follow the same model: comprehensive database, powerful filters, configuration-heavy setup.

You decide what you're looking for - company size, industry, revenue band, technology installed, hiring patterns. You configure filters. You export a list. You upload to your CRM or email tool. You reach out.

The strength here is breadth. You get access to massive datasets, and if you know exactly what you're looking for, you can slice the data very precisely.

The weakness: this is a list-building model, not a running system. You build a list, it starts aging the moment you create it. Three weeks later, half your targets have changed their tech stack, hired new people, or gone into a hiring freeze. You need to rebuild the list.

And the configuration burden is real. If you're a head of sales with no RevOps team, spending an hour setting up filters and configuring segments feels fine. Doing it every two weeks starts feeling like a job.

ZoomInfo is particularly expensive for small teams (£1,200 - £2,000+ per month depending on setup), which makes the aging problem worse. You're paying premium prices for outdated data.

Apollo is cheaper (around £700 - £1,000 per month), but you're inheriting the same structural problem: list-building, not continuous discovery.

Clay: powerful, but requires technical depth

Clay deserves respect. It's one of the most flexible tools out there. You can pull data from job boards, pull Companies House filings, cross-reference websites, trigger workflows, and automate research at massive scale.

The catch: it assumes you have someone who can build and maintain that. A non-technical founder or sales leader can use Clay, but you'll hit complexity walls quickly. If you want to automate something custom, you're either learning their builder interface deeply or hiring someone who understands it.

Clay works brilliantly for teams that have already decided "we're going to invest in building a custom prospecting engine." If that's you, great. But it's a different decision - you're not just buying a tool, you're building an ops function in-house.

Pricing is reasonable (around £500 - £1,200 per month depending on usage), but add 40 hours of setup time and you're looking at a real investment.

Cognism: exceptional data, wrong model for small budgets

Cognism has the best B2B contact data in Europe. Their team has put genuine effort into coverage, accuracy, and freshness. If you need verified email and phone numbers for UK companies, they're genuinely strong.

The problem is they're priced like an enterprise tool (£2,000 - £5,000+ per month), built on the assumption that you're a large sales organisation with a dedicated buyer. For a 5 - 10 person sales team, that's a disproportionate spend on pure data.

Cognism also doesn't solve the discovery problem. You still need to figure out which accounts to target. They give you people for accounts you already know about.

How Firmbase works differently

Firmbase is built on a completely different assumption: you define your ICP once, we continuously surface the right accounts.

Instead of filters, you describe your ideal customer in natural language. "Mid-market SaaS companies in the UK with revenue between £2M and £10M that have appointed a new finance director in the last 12 months" - that's one instruction, not a 15-minute filter configuration.

The system runs continuously. We monitor Companies House filings, job postings, funding announcements, and growth signals. When an account matches your criteria and shows a buying signal, we surface it. You don't rebuild the list - the list rebuilds itself.

Because we're built on Companies House data, we have a structural advantage in the UK. We know revenue, cash position, director appointments, and structural changes earlier than database companies who rely on scraped data and surveys. Companies House is the source of truth - it's quarterly filing data, and it's comprehensive for UK-registered businesses.

We also don't use filter configuration. We use natural language search. Instead of "select industry = 6202, select employee band = 50 - 250, select technology = HubSpot," you ask: "Show me media agencies in London that use HubSpot."

And unlike Clay, we don't require engineering. Setup takes 15 minutes. The system does the work.

Comparison table

When you might choose each tool

Choose ZoomInfo if: You have a RevOps person, you need enterprise support, and you're working with a large sales team. The cost is worth it if someone's managing the system.

Choose Apollo if: You want the ZoomInfo model at half the price and your team has discipline around list maintenance.

Choose Clay if: You want maximum flexibility and have someone (internal or external) who can build custom automations. You're treating this as a platform to build on.

Choose Cognism if: Contact accuracy is your primary constraint and you have budget for an enterprise tool.

Choose Firmbase if: You're a UK SMB sales team, you don't have RevOps, you want continuous discovery (not list building), and you want something that works out of the box without configuration or rebuild cycles.

The real difference isn't features, it's category

These tools aren't really competing. They're in different categories.

ZoomInfo and Apollo are industrial data warehouses. They're built on the assumption that you know what you're looking for and you can configure precisely to find it.

Clay is a builder's platform. It's built on the assumption that you want to craft something custom.

Cognism is a data vendor. It's built on the assumption that accurate contact information is your bottleneck.

Firmbase is a running system. It's built on the assumption that continuous discovery of accounts matching your ICP, combined with real buying signals, is what actually drives pipeline.

Which category fits your team?

Ready to see how Firmbase discovers and prioritises your best accounts without RevOps overhead?

Firmbase works differently because it's built for teams like yours - focused on UK B2B sales, without the operations infrastructure of larger enterprises.

Start your free trial and see your account universe in 15 minutes.

FAQ

Q: How does Firmbase handle contact data accuracy if you're relying on Companies House?

A: Companies House gives us company and director data with high confidence. For contact details (email, phone), we partner with data providers and validate through network lookups. It's slightly lower coverage than a pure contact database like Cognism, but it's fresher because we're building on Companies House as the foundation rather than trying to verify outdated company data.

Q: Can I use Firmbase alongside ZoomInfo or Apollo?

A: Yes. Many teams use Firmbase for continuous discovery and account prioritisation, then use a contact database for bulk email pulls or when they need a specific phone number. The two solve different problems.

Q: What if my company isn't registered at Companies House (e.g., I'm selling to US or Australian companies)?

A: Firmbase is built for UK SMB sellers targeting UK-registered companies. If your market is international, Firmbase isn't the right fit. That's when Apollo or ZoomInfo (with international data) make more sense.

Q: Does Firmbase replace my CRM?

A: No. Firmbase sits upstream of your CRM. It identifies and prioritises accounts, tells you which people to target, and why. You still use your CRM to manage opportunities, track activity, and forecast. They work together.

Q: Why is Firmbase cheaper than these other tools?

A: We're not cheaper by accident. We're built on a different model - continuous discovery instead of list-building, natural language instead of configuration, and Companies House data instead of trying to maintain our own global database. That model is more efficient, and we pass that efficiency to you.

Q: Can I export lists from Firmbase if I want to use them elsewhere?

A: Yes. You can export account lists and contact information. But the real value isn't the export - it's the continuous stream of prioritised accounts and buying signals you get from staying in the system. Once you leave, you lose that signal.

Author Bio

Anna Fontanes is a revenue operations consultant who has built account scoring and ICP frameworks for UK B2B sales teams across SaaS and professional services. She specialises in making structured prospecting work for teams without dedicated ops resource.