Apollo.io vs TheirStack: Data Enrichment Tool Comparison
Compare Apollo.io and TheirStack side by side. See pricing, features, and integrations to choose the right data enrichment tool for your needs.
Compare Apollo.io and TheirStack side by side. See pricing, features, and integrations to choose the right data enrichment tool for your needs.
Reviewed and updated September 2, 2026
Apollo.io vs TheirStack: Data Enrichment Tool Comparison
Sales teams evaluating B2B lead data and contact enrichment tools often narrow their shortlist to Apollo.io and TheirStack. Both target the same job, but they cater to different workflows and budgets. This comparison covers pricing, features, and integrations so you can pick the right fit.
The Quick Answer
By each vendor's own wording, Apollo.io lists 210m+ contacts database and 30m+ companies, while TheirStack lists job search and company search. A capability both offer can appear under different names, so read both feature lists below.
Both start at the same price point ($0/mo), so the decision comes down to features and workflow fit.
If your priority is finding accurate contact data for target accounts, both tools target it. The right choice depends on your budget, team size, and the specific capabilities you need most.
Understanding the Core Difference
Apollo.io is All-in-one sales intelligence platform with 210M+ contacts, AI-powered campaigns, and built-in email sequencing.
TheirStack is Job posting and technographics database for sales teams. Finds companies by the technologies they use and the roles they are hiring for, and enriches a company list with technographics and buying intent.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Apollo.io Pricing (as of September 2026)
| Plan | Price | Contacts |
|---|---|---|
| Free | Free | 900 credits per seat per year, granted monthly |
| Basic | $49/mo | 30,000 credits per seat per year, granted upfront |
| Professional | $79/mo | 48,000 credits per seat per year, granted upfront |
| Organization | $119/mo | 72,000 credits per seat per year, granted upfront |
Source: Apollo.io Pricing
TheirStack Pricing (as of September 2026)
| Plan | Price | Contacts |
|---|---|---|
| Free | Free | 50 company credits and 200 API credits per month |
| App | Usage-based | Company credit packs from 1,000 to 200,000 credits |
| API, Webhooks & MCP | $49/mo | 1,500 API credits per month |
| Datasets | Contact Sales | Jobs, Technographics and Buying intents datasets |
Source: TheirStack Pricing
Pricing Analysis
Both platforms start at the same $0/mo price point. The decision comes down to which feature set and tier structure works better for your expected usage.
Both platforms offer free tiers, so you can test each one before spending anything.
Features Breakdown
- 210M+ contacts database
- 30M+ companies
- AI-powered multichannel campaigns
- Email deliverability guardrails
- Anonymous visitor identification
- Real-time form enrichment
- and 4 more listed below
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- and 2 more listed below
Apollo.io Key Features
- 210M+ contacts database
- 30M+ companies
- AI-powered multichannel campaigns
- Email deliverability guardrails
- Anonymous visitor identification
- Real-time form enrichment
- Contact and company enrichment
- Advanced filtering
- CRM data cleansing
- Pipeline boards
TheirStack Key Features
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
The two lists below are a diff of each vendor's own feature list by exact wording, so a capability both tools offer can appear on either side under a different name.
Listed only by Apollo.io
- 210M+ contacts database
- 30M+ companies
- AI-powered multichannel campaigns
- Email deliverability guardrails
- Anonymous visitor identification
- Real-time form enrichment
- Contact and company enrichment
- Advanced filtering
- CRM data cleansing
- Pipeline boards
Listed only by TheirStack
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
Integration Ecosystem
Apollo.io Integrations
Apollo.io connects with: Salesforce, HubSpot, Outreach, SalesLoft, Marketo, SendGrid, LinkedIn.
TheirStack Integrations
TheirStack connects with: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Integrations listed only by Apollo.io: Salesforce, HubSpot, Outreach, SalesLoft, Marketo, SendGrid, LinkedIn.
Integrations listed only by TheirStack: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Use Case Recommendations
Best Fit for Apollo.io
- Budget-conscious teams looking for an affordable data enrichment tool
- Teams that need a wide feature set (10 capabilities listed)
- Organizations with complex tech stacks needing broad integration support (7 integrations)
- Teams that want to start free and scale up as needs grow
Best Fit for TheirStack
- Budget-conscious teams looking for an affordable data enrichment tool
- Teams that want to start free and scale up as needs grow
- Enterprise buyers who prefer custom pricing and dedicated support
Feature Comparison Summary
| Feature | Apollo.io | TheirStack |
|---|---|---|
| Starting Price | Free | Free |
| Top Tier Price | $119/mo | Contact Sales |
| Total Features Listed | 10 | 8 |
| Integrations | 7 | 5 |
| Founded | N/A | 2021 |
Getting Started Checklist
- Define your B2B lead data and contact enrichment requirements and monthly budget
- Estimate your expected data credits or contact lookups to find the right tier
- List the integrations your team currently relies on
- Sign up for free trials or demos of both platforms
- Run a small test with each tool before making a commitment
- Evaluate the onboarding experience and support quality
Final Thoughts
Apollo.io and TheirStack both serve the B2B lead data and contact enrichment market. Apollo.io offers a more accessible entry point, while TheirStack starts at $0/mo. Your decision should weigh pricing against the specific features that matter most for your workflow.
Start with a trial of each to see which platform fits your team's daily process. The best tool is the one your team actually uses consistently.
Pricing and features verified as of September 2026. Visit Apollo.io and TheirStack for current information.
About the author.
Tim Carden is CMO / CTO at RevenueFlow, which builds and operates outbound revenue engines for B2B companies. Studied at McGill University.
Tim Carden · CMO / CTO
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