FullEnrich vs TheirStack: Data Enrichment Tool Comparison

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)

Source: FullEnrich Pricing

TheirStack Pricing (as of September 2026)

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

FullEnrich lists

• 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

Both tools

• MCP Server

TheirStack lists

• 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

Getting Started Checklist

1. Define your B2B lead data and contact enrichment requirements and monthly budget
2. Estimate your expected data credits or contact lookups to find the right tier
3. List the integrations your team currently relies on
4. Sign up for free trials or demos of both platforms
5. Run a small test with each tool before making a commitment
6. 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.