Proofy vs TheirStack: Data Enrichment Tool Comparison
Compare Proofy and TheirStack side by side. See pricing, features, and integrations to choose the right data enrichment tool for your needs.
Compare Proofy and TheirStack side by side. See pricing, features, and integrations to choose the right data enrichment tool for your needs.
Reviewed and updated September 4, 2026
Proofy vs TheirStack: Data Enrichment Tool Comparison
Finding the right data enrichment tool can directly impact your revenue pipeline. Proofy and TheirStack both aim to solve the same core problem (finding accurate contact data for target accounts), yet they approach it differently. Let's break down the specifics.
The Quick Answer
By each vendor's own wording, Proofy lists bulk email verification and single verification in real time, while TheirStack lists job search and company search. A capability both offer can appear under different names, so read both feature lists below.
TheirStack offers a lower entry point at $0/mo compared to Proofy at $5/mo.
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
Proofy is Proofy is an email verification service for bulk list cleaning and real-time single verification through an API, with SMTP, syntax, domain, disposable and accept-all detection. Credits are sold pay-as-you-go or by subscription, never expire, and unknown results are not charged.
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
Trial pack
Free
Proofy Pricing (as of September 2026)
| Plan | Price | Emails |
|---|---|---|
| Trial pack | Usage-based | 5,000 verifier checks |
| Pay-As-You-Go 1,000 | Usage-based | 1,000 credits |
| Pay-As-You-Go volume | Usage-based | - |
| Monthly subscription | Contact Sales | - |
Source: Proofy 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
TheirStack offers the lower entry point ($0/mo vs $5/mo). Teams watching their budget will appreciate the savings, especially when starting out.
TheirStack includes a free tier, which is helpful for evaluating the platform without upfront cost.
Features Breakdown
- Bulk email verification
- Single verification in real time
- Email verifier API
- Duplicate email remover
- ISP detection
- Disposable and temporary detection
- and 4 more listed below
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- and 2 more listed below
Proofy Key Features
- Bulk email verification
- Single verification in real time
- Email verifier API
- Duplicate email remover
- ISP detection
- Disposable and temporary detection
- Accept-all detection
- Syntax validation
- SMTP verification
- Mailbox full detection
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 Proofy
- Bulk email verification
- Single verification in real time
- Email verifier API
- Duplicate email remover
- ISP detection
- Disposable and temporary detection
- Accept-all detection
- Syntax validation
- SMTP verification
- Mailbox full detection
Listed only by TheirStack
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
Integration Ecosystem
Proofy Integrations
Proofy connects with: .
TheirStack Integrations
TheirStack connects with: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Integrations listed only by TheirStack: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Use Case Recommendations
Best Fit for Proofy
- Budget-conscious teams looking for an affordable data enrichment tool
- Teams that need a wide feature set (10 capabilities listed)
- Enterprise buyers who prefer custom pricing and dedicated support
Best Fit for TheirStack
- Budget-conscious teams looking for an affordable data enrichment tool
- Organizations with complex tech stacks needing broad integration support (5 integrations)
- 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 | Proofy | TheirStack |
|---|---|---|
| Starting Price | Usage-based | Free |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 10 | 8 |
| Integrations | 0 | 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
Proofy and TheirStack both serve the B2B lead data and contact enrichment market. TheirStack offers a more accessible entry point, while Proofy starts at $5/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 Proofy 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
Connect on LinkedIn →Explore more.
Ready to scale your outreach?
We build GTM engines that book real meetings. See the receipts.
Related articles.
Datanyze vs Proofy: Data Enrichment Tool Comparison
Compare Datanyze and Proofy side by side. See pricing, features, and integrations to choose the right data enrichment tool for your needs.
Datanyze vs Daylite: Data Enrichment Tool vs CRM Platform Comparison
Compare Datanyze (data enrichment tool) and Daylite (CRM platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Datanyze vs FunnelFLARE: Data Enrichment Tool vs Sales Engagement Platform Comparison
Compare Datanyze (data enrichment tool) and FunnelFLARE (sales engagement platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Datanyze vs Leadspicker: Data Enrichment Tool vs Sales Engagement Platform Comparison
Compare Datanyze (data enrichment tool) and Leadspicker (sales engagement platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Datanyze vs LeadSquared: Data Enrichment Tool vs CRM Platform Comparison
Compare Datanyze (data enrichment tool) and LeadSquared (CRM platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Datanyze vs Luru: Data Enrichment Tool vs Sales Engagement Platform Comparison
Compare Datanyze (data enrichment tool) and Luru (sales engagement platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.