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. 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.
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.
How ZoomInfo and Apollo work (and why they might not fit smaller teams)
Both follow the same model: comprehensive database, powerful filters, configuration-heavy setup. You decide what you're looking for, configure filters, export a list, upload to your CRM, reach out.
The strength here is breadth. You get access to massive datasets.
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.
ZoomInfo is particularly expensive for small teams (£1,200 - £2,000+ per month), which makes the aging problem worse. Apollo is cheaper (around £700 - £1,000 per month), but you're inheriting the same structural problem.
Clay: powerful, but requires technical depth
Clay deserves respect. It's one of the most flexible tools out there. 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.
Clay works brilliantly for teams that have already decided "we're going to invest in building a custom prospecting engine." 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. 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).
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. 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.
Because we're built on Companies House data, we have a structural advantage in the UK. Companies House is the source of truth - it's quarterly filing data, and it's comprehensive for UK-registered businesses.
Comparison table
When you might choose each tool
Choose ZoomInfo if you have a RevOps person, need enterprise support, and are working with a large sales team.
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 who can build custom automations.
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, and you want something that works out of the box.
Start your free trial at app.firmbase.co/signup
FAQ
How does Firmbase handle contact data accuracy if you're relying on Companies House?
Companies House gives us company and director data with high confidence. For contact details, we partner with data providers and validate through network lookups.
Can I use Firmbase alongside ZoomInfo or Apollo?
Yes. Many teams use Firmbase for continuous discovery and account prioritisation, then use a contact database for bulk email pulls.
What if my company isn't registered at Companies House?
Firmbase is built for UK SMB sellers targeting UK-registered companies. If your market is international, Apollo or ZoomInfo make more sense.
Why is Firmbase cheaper than these other tools?
We're built on a different model - continuous discovery instead of list-building, natural language instead of configuration, and Companies House data instead of maintaining a global database.
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.