Quick answerApollo.io is a powerhouse all-in-one prospecting and outreach engine with a massive contact database; Clay is the secret weapon for ops-savvy teams who want to enrich, waterfall, and automate with surgical precision. Most SDR teams should start with Apollo — power users who live in spreadsheets will love Clay.
Free Plan
Free tier with 100 credits/month
Free tier with 10,000 email credits/month
Starting Paid Price
~$149/month (Starter)
~$49/seat/month (Basic)
Contact Database
No native DB; pulls from 75+ external providers
275M+ contacts, 65M+ companies
Data Enrichment
Waterfall enrichment across 75+ sources in one table
Single-source enrichment via Apollo database
Email Sequencing
Not native; connects via Instantly, Smartlead, etc.
Built-in multi-step sequences with A/B testing
AI Research / Agents
Built-in AI agent rows (Claygent) for custom research
AI scoring & basic AI-assist on copy
CRM Built-in
No native CRM
Lightweight CRM included
Workflow / Automation
Spreadsheet-like tables with trigger-based automation
Plays and workflow automations (less flexible)
Chrome Extension
Yes, LinkedIn scraping & enrichment
Yes, richer LinkedIn + website prospecting
API Access
Yes, on paid plans
Yes, on paid plans
Learning Curve
Steep — spreadsheet logic required
Gentle — intuitive UI for any rep
Best For
RevOps, growth engineers, data-driven GTM teams
SDRs, AEs, and full-cycle sales reps
Worth knowing
- Clay integrates with 75+ enrichment providers simultaneously, letting you waterfall across sources to maximize hit rate without paying for duplicates.
- Apollo's database covers 275M+ contacts and is constantly re-verified — but data accuracy still averages around 70-80%, typical for the industry.
- Clay's 'Claygent' uses GPT-powered agents to autonomously research prospects and fill custom fields — like having a junior researcher on speed dial.
- Apollo includes a built-in dialer, email sequencer, and deal pipeline, making it a genuine all-in-one for teams that don't want a tool stack.
- Clay charges in 'credits' that can be consumed quickly on enrichment-heavy tables, so costs can balloon fast on large lists without careful planning.
Clay's power users have built tables that automatically research a prospect, write a hyper-personalized email referencing their latest tweet, and push it to an outreach tool — all while the SDR was on a coffee break. Apollo users are still clicking 'Add to Sequence.'
If you wantYou want an out-of-the-box prospecting + outreach solution your whole sales team can use on day one
Apollo bundles database, sequencing, dialer, and CRM with a UI that any rep can navigate without a tutorial.
→ Pick Apollo.io If you wantYou want maximum enrichment coverage and AI-powered personalization at scale
Clay's waterfall enrichment across 75+ sources and Claygent AI research dramatically outperforms any single-source tool.
→ Pick Clay If you wantYou're a RevOps or growth engineer building automated GTM workflows
Clay's trigger-based table logic and deep integrations make it the most flexible automation layer in the modern stack.
→ Pick Clay If you wantYou're an early-stage startup watching budget closely
Apollo's free plan is genuinely generous, and paid tiers are far cheaper for getting a sales motion off the ground.
→ Pick Apollo.io Some links on this page are affiliate links. If you sign up through them, we may earn a commission at no extra cost to you.