We use Apollo and Clay every day. Not as reviewers looking for things to write about. As practitioners building outbound campaigns for B2B clients.

Both tools are good. Neither is perfect. And the right choice depends entirely on what you are trying to do.

Here is an honest comparison from people who actually use both in production.

In production: we use the Apollo + Clay stack to power campaigns like Leaptree, where it generated $320K in pipeline within 90 days.

What Each Tool Does

Apollo is an all-in-one sales platform. It combines a massive contact database, email sequencing, a dialler, and basic enrichment into a single tool. Think of it as your prospecting Swiss Army knife.

Clay is a data enrichment and workflow platform. It connects to 75+ data providers, lets you build enrichment "waterfalls" that pull from multiple sources, and automates research workflows. Think of it as a prospecting power tool.

The fundamental difference: Apollo gives you a database to search. Clay gives you a system to enrich and research any list you bring.

Data Quality

This is where it matters most.

Apollo's data:

• 275M+ contact records

• Email accuracy: 85-92% (varies by segment)

• Good for common job titles at well-known companies

• Weaker for niche industries, small companies, and non-English speaking markets

• Data is self-contained. What you see is what you get.

Clay's data:

• No proprietary database. Instead, it aggregates from 75+ data providers (Apollo is one of them, along with Clearbit, Hunter, Dropcontact, Lusha, and others)

• Email accuracy: 90-97% when using waterfall enrichment across multiple providers

• Stronger for niche segments because it cross-references multiple sources

• Data quality depends on how well you configure your enrichment workflows

Our take: Clay produces higher quality data when configured properly. The waterfall approach (try source A, if no result try source B, then C) catches contacts that any single provider misses. But it requires more setup and expertise.

For quick prospecting on common ICPs, Apollo's built-in database is faster and simpler.

Features Comparison

Pricing

Apollo pricing (2026):

• Free: Limited credits, good for testing

• Basic: $49/month per user (annual) or $59/month (monthly billing)

• Professional: $79/month per user (annual) or $99/month (monthly)

• Organisation: $119/month per user (annual), minimum 3 users

Credits are consumed when you access contact details. Volume users burn through credits quickly, and overage credits cost $0.20 each. Phone number credits cost 8x more than email credits, so heavy phone prospecting gets expensive fast.

Clay pricing (2026, post-March restructure):

Clay overhauled their pricing in March 2026. The old Starter/Explorer/Pro tiers are gone. The new structure:

• Free: 100 Data Credits + 500 Actions per month

• Launch: $185/month ($167/month on annual billing). 2,500 Data Credits + 15,000 Actions

• Growth: $495/month ($446/month annual). Higher credit and action limits

• Enterprise: Custom pricing

The biggest change: Clay now uses a dual credit system. Data Credits are for enrichment lookups (finding emails, company data, technographics). Actions are for platform operations (running workflows, routing requests). The split actually reduced per-lookup costs by 50-90% compared to the old system, since Clay negotiated volume discounts with data partners.

Our take: Apollo is cheaper for simple prospecting. Clay is more expensive but delivers better data quality, which means lower bounce rates and higher reply rates. The ROI on better data usually justifies the cost. Clay's March 2026 restructure actually made it more cost-effective for heavy users.

When to Use Apollo

• You are getting started with outbound and need a simple, all-in-one tool

• Your ICP is straightforward (e.g., "VP of Sales at SaaS companies with 50-500 employees in the US")

• You want built-in sequencing and do not want to manage multiple tools

• Budget is tight and you need the most features for the lowest cost

• You need a dialler for cold calling alongside email

Apollo is the right starting point for most companies running their first outbound campaigns.

When to Use Clay

• Data quality is critical and you cannot afford high bounce rates

• Your ICP is niche and a single data source does not have enough coverage

• You need deep personalisation and want AI-powered research on each prospect

• You are running campaigns at scale and need enrichment workflows that handle thousands of contacts

• You already have a sending tool (Smartlead, Instantly, or similar) and need a best-in-class data layer

Clay is the right choice for agencies (like us) and companies that have outgrown Apollo's data limitations.

How We Use Both

At Built For B2B, our workflow looks like this:

1. Apollo for initial prospecting. We use Apollo's database to build initial target lists based on firmographic and job title filters.

2. Clay for enrichment. We run those lists through Clay's waterfall enrichment to find verified emails, enrich with technographic data, and pull research for personalisation.

3. Smartlead for sending. Enriched lists go into Smartlead for cold email campaigns with proper domain rotation.

4. HeyReach for LinkedIn. Parallel LinkedIn outreach sequences coordinate with email touchpoints.

Apollo for breadth. Clay for depth. Each tool does what it does best.

The Verdict

There is no single winner. The right tool depends on your stage and needs:

• Just starting outbound? Apollo. It is simpler, cheaper, and gives you everything in one place.

• Scaling outbound or running an agency? Clay. The data quality advantage compounds as you send more volume.

• Serious about results? Both. Apollo for list building, Clay for enrichment.

The tool matters less than the system around it. The best data in the world, sent through broken infrastructure with generic copy, produces nothing. The tool is one piece of a larger outbound engine.

Want us to build that engine for you? Book a strategy call. We will show you exactly how we combine these tools to generate pipeline for companies like yours.