Two leading platforms for B2B prospecting with fundamentally different approaches to data and workflow.
Platform Overview
Apollo.io
Apollo.io is a comprehensive sales intelligence and engagement platform combining prospecting data with outbound execution tools.
Apollo says its database holds 240M+ people and 30M+ companies.
Core Capabilities:
- Searchable database of B2B contacts
- Email finder and verification with deliverability scoring
- Phone number database with direct dials
- Email sequencing and automation
- Cloud-based phone dialer
- Meeting scheduling and task management
- Chrome extension for LinkedIn prospecting
- Native CRM integrations
Pricing: Free plan available.
Paid plans run from $49 to $119 per user per month on annual billing, per Apollo.
Clay
Clay is a data enrichment and automation layer that, by its own count, connects to 150+ data providers.
Core Capabilities:
- Access to many data enrichment providers
- Waterfall enrichment across multiple sources
- Custom workflow builder
- AI-powered data transformation
- Spreadsheet-like interface
- API access for custom integrations
Pricing: Free plan with limited credits.
Paid plans run from $167/month (Launch) to $446/month (Growth) on monthly billing, with Enterprise priced on request, per Clay's pricing page.
Key Differences
| Aspect | Apollo | Clay |
|---|---|---|
| Data Source | Proprietary database | Aggregates many providers |
| Use Case | End-to-end prospecting | Data enrichment & workflows |
| Complexity | Low, easy to use | High, requires setup |
| Sales Engagement | Built-in sequences, dialer | None: export to other tools |
| Best For | Sales teams wanting simplicity | RevOps teams with complex needs |
Data Philosophy
Apollo maintains a proprietary database built through web scraping and user contributions.
Unified approach provides consistency but may have coverage gaps.
Clay aggregates multiple third-party sources, allowing waterfall checking across several sources for a single data point.
Higher coverage but requires more setup.
Technical Complexity
Apollo offers straightforward UX.
Reps can prospect within hours of onboarding.
Clay requires technical sophistication and understanding of data sources and automation concepts.
When to Choose Apollo
- Your team needs all-in-one simplicity
- Budget is constrained
- You prioritize speed to value
- Standard B2B outbound workflows are sufficient
- Limited RevOps resources
When to Choose Clay
- You need maximum data coverage and accuracy
- Complex data requirements with custom scoring
- You already use dedicated sales engagement tools
- You have RevOps resources
- You need reverse email lookup at scale
Using Both Together
Many sophisticated teams use both:
- Clay for enrichment, Apollo for engagement: Enrich in Clay, execute sequences in Apollo
- Apollo for quick wins, Clay for strategic: Apollo for mid-market, Clay for enterprise
- Clay as data layer above Apollo: Access Apollo's API through Clay alongside other sources
Conclusion
Apollo excels as an accessible, all-in-one platform for teams wanting prospecting and engagement without technical complexity.
Clay provides superior data operations for teams with RevOps resources and sophisticated requirements.
Tools are only part of the answer, and our guide to choosing a go-to-market strategy agency covers who should own the workflow.
For smaller sales teams, Apollo usually offers better value.
For teams with complex data needs or existing engagement tools, Clay provides capabilities that justify the additional complexity.
If you are weighing up outside help, start with what a go-to-market agency actually does.
If you are in the UK, also see how a London GTM agency like GTM Quest scopes the work before anyone quotes.