FullEnrich vs TheirStack: Data Enrichment Tool Comparison
Compare FullEnrich and TheirStack side by side. See pricing, features, and integrations to choose the right data enrichment tool for your needs.
FullEnrich and TheirStack both start free at $0 per month for B2B contact and company enrichment. FullEnrich focuses on waterfall enrichment across 25+ sources and mobile phone enrichment, with 8 integrations including HubSpot and Claude. TheirStack focuses on job search, company search, and technographics data, offering 5 integrations across 4 pricing tiers.
Key takeaways
- FullEnrich's Pro plan costs $55 per month for 1,000 credits, while TheirStack's API, Webhooks and MCP plan costs $49 per month for 1,500 API credits.
- Both FullEnrich and TheirStack offer free tiers starting at $0 per month.
- TheirStack offers 4 pricing tiers compared to FullEnrich's 3 pricing tiers.
- FullEnrich integrates with 8 tools including HubSpot, Claude, OpenAI and Manus, while TheirStack integrates with 5 tools including LinkedIn Audiences.
- TheirStack was founded in 2021, while FullEnrich's founding year is not listed in the comparison.
Reviewed and updated September 5, 2026
FullEnrich vs TheirStack: Data Enrichment Tool Comparison
Sales teams evaluating B2B lead data and contact enrichment tools often narrow their shortlist to FullEnrich 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, FullEnrich lists waterfall enrichment across 25+ sources and mobile phone enrichment, 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
FullEnrich is B2B contact enrichment platform returning verified work emails, personal emails and mobile phone numbers through waterfall enrichment across 25+ data sources. Available in the app, a REST API and an MCP server.
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.
Both platforms offer mcp server. Where they diverge is in their approach to pricing tiers and advanced capabilities.
Pricing Comparison
FullEnrich Pricing (as of September 2026)
| Plan | Price | Contacts |
|---|---|---|
| Free trial | Free | 50 credits to start |
| Pro | $55/mo | 1,000 credits / month |
| Enterprise | Contact Sales | Custom |
Source: FullEnrich 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.
TheirStack offers 4 pricing tiers compared to FullEnrich's 3, giving you more granularity as you scale.
Both platforms offer free tiers, so you can test each one before spending anything.
Features Breakdown
- Waterfall enrichment across 25+ sources
- Mobile Phone Enrichment
- Work Email Enrichment
- Personal Email Enrichment
- Reverse Email Lookup
- Bulk CSV Enrichment
- and 1 more listed below
- MCP Server
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- and 1 more listed below
FullEnrich Key Features
- Waterfall enrichment across 25+ sources
- Mobile Phone Enrichment
- Work Email Enrichment
- Personal Email Enrichment
- Reverse Email Lookup
- Bulk CSV Enrichment
- MCP Server
- Unlimited users included
TheirStack Key Features
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
Shared Capabilities
Both FullEnrich and TheirStack include:
- 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 FullEnrich
- Waterfall enrichment across 25+ sources
- Mobile Phone Enrichment
- Work Email Enrichment
- Personal Email Enrichment
- Reverse Email Lookup
- Bulk CSV Enrichment
- Unlimited users included
Listed only by TheirStack
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
Integration Ecosystem
FullEnrich Integrations
FullEnrich connects with: HubSpot, Clay, Zapier, Make, n8n, Claude, OpenAI, Manus.
TheirStack Integrations
TheirStack connects with: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Shared Integrations
Both tools integrate with: Clay, Zapier, Make, n8n.
Integrations listed only by FullEnrich: HubSpot, Claude, OpenAI, Manus.
Integrations listed only by TheirStack: LinkedIn Audiences.
Use Case Recommendations
Best Fit for FullEnrich
- Budget-conscious teams looking for an affordable data enrichment tool
- Organizations with complex tech stacks needing broad integration support (8 integrations)
- Teams that want to start free and scale up as needs grow
- Enterprise buyers who prefer custom pricing and dedicated support
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 | FullEnrich | TheirStack |
|---|---|---|
| Starting Price | Free | Free |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 8 | 8 |
| Integrations | 8 | 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
FullEnrich and TheirStack both serve the B2B lead data and contact enrichment market. FullEnrich 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 FullEnrich and TheirStack for current information.
Frequently asked questions.
Frequently asked questions- What's the main difference between FullEnrich and TheirStack?
- FullEnrich is a B2B contact enrichment platform that returns verified work emails, personal emails and mobile phone numbers through waterfall enrichment across 25+ data sources. TheirStack is a job posting and technographics database that finds companies by the technologies they use and the roles they are hiring for, then enriches company lists with technographics and buying intent.
- How much does FullEnrich cost compared to TheirStack?
- FullEnrich's Pro plan is $55 per month for 1,000 credits, and its Enterprise plan requires contacting sales. TheirStack's API, Webhooks and MCP plan is $49 per month for 1,500 API credits, with a usage-based App plan and a Datasets plan that also requires contacting sales. Both tools offer a free tier starting at $0 per month.
- Which integrations do FullEnrich and TheirStack support?
- FullEnrich connects with HubSpot, Clay, Zapier, Make, n8n, Claude, OpenAI and Manus, totaling 8 integrations. TheirStack connects with Clay, LinkedIn Audiences, Make, N8N and Zapier, totaling 5 integrations. The two tools share Clay, Zapier, Make and n8n as common integrations.
- Is FullEnrich or TheirStack better for budget-conscious teams?
- Both tools suit budget-conscious teams since each offers a free tier at $0 per month before any paid commitment. The article lists budget-conscious teams as a best-fit use case for both FullEnrich and TheirStack, along with teams that want to start free and scale up as needs grow.
- How do the feature sets of FullEnrich and TheirStack compare?
- Both platforms list 8 features total. FullEnrich's list includes waterfall enrichment, mobile phone enrichment, work and personal email enrichment, reverse email lookup, bulk CSV enrichment, MCP server, and unlimited users. TheirStack's list includes job search, company search, company lookup, enrichment, exports, email alerts, webhooks, and MCP server. Both share an MCP server.
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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