Overloop AI vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
Compare Overloop AI (sales engagement platform) and TheirStack (data enrichment tool) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Overloop AI is a sales engagement platform for multi-channel outreach starting at $69/mo, while TheirStack is a data enrichment tool for B2B lead and company data with a free tier and a $49/mo API plan. Teams needing outreach coordination should pick Overloop AI, those needing contact data enrichment should pick TheirStack, and many teams use both.
Key takeaways
- Overloop AI's Starter plan costs $69/mo and includes 250 credits per user per month with 1 email account and 3 campaigns.
- TheirStack's free plan includes 50 company credits and 200 API credits per month.
- Overloop AI lists 10 features on its own page including a 450M+ prospect database and AI-powered campaigns.
- TheirStack lists 8 features including job search, company search, and an MCP server.
- Overloop AI integrates with 8 tools including HubSpot, Salesforce, and Pipedrive, while TheirStack integrates with 5 tools including Clay and LinkedIn Audiences, with Zapier as the only shared integration.
Reviewed and updated September 4, 2026
Overloop AI vs TheirStack: Sales Engagement Platform vs Data Enrichment Tool Comparison
Sales teams building an outbound stack often weigh Overloop AI, a sales engagement platform for multi-channel sales outreach and engagement tracking, against TheirStack, a data enrichment tool for B2B lead data and contact enrichment. They cover different parts of the workflow, so this comparison covers what each one does, what each one costs, and where they overlap.
The Quick Answer
Overloop AI is a sales engagement platform for multi-channel sales outreach and engagement tracking; TheirStack is a data enrichment tool for B2B lead data and contact enrichment. By each vendor's own wording, Overloop AI lists ai-powered campaigns and 450m+ prospects database, and TheirStack lists job search and company search.
TheirStack offers a lower entry point at $0/mo compared to Overloop AI at $69/mo.
If your priority is coordinating outreach across email, phone, and social channels, Overloop AI is the one built for it; for finding accurate contact data for target accounts, that is TheirStack. Many teams run one of each.
Understanding the Core Difference
Overloop AI is Sales prospecting platform that finds verified B2B contacts and runs personalized email and social outreach campaigns. Includes a 450M+ B2B contact database, an email finder and verifier, and AI-written campaigns and follow-ups.
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
Starter
Free
Overloop AI Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Starter | $69/mo | 250 credits per month per user | 1 email account per user; 3 campaigns |
| Growth | $99/mo | 500 credits per month per user | 3 email accounts per user; 10 campaigns |
| Enterprise | Contact Sales | 1,000 credits per month per user | Unlimited email accounts; Unlimited campaigns |
Source: Overloop AI 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 $69/mo). Teams watching their budget will appreciate the savings, especially when starting out.
TheirStack offers 4 pricing tiers compared to Overloop AI's 3, giving you more granularity as you scale.
TheirStack includes a free tier, which is helpful for evaluating the platform without upfront cost.
Features Breakdown
- AI-powered campaigns
- 450M+ prospects database
- Verified Email Addresses
- Smart multichannel campaigns (Email + social)
- AI-powered Outreach Followups
- Email Finder & Verifier
- and 4 more listed below
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- and 2 more listed below
Overloop AI Key Features
- AI-powered campaigns
- 450M+ prospects database
- Verified Email Addresses
- Smart multichannel campaigns (Email + social)
- AI-powered Outreach Followups
- Email Finder & Verifier
- Chrome Extension for LinkedIn
- Conversations Inbox
- Email Warmup
- REST API
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 Overloop AI
- AI-powered campaigns
- 450M+ prospects database
- Verified Email Addresses
- Smart multichannel campaigns (Email + social)
- AI-powered Outreach Followups
- Email Finder & Verifier
- Chrome Extension for LinkedIn
- Conversations Inbox
- Email Warmup
- REST API
Listed only by TheirStack
- Job search
- Company search
- Company lookup
- Enrichment
- Exports
- Email alerts
- Webhooks
- MCP server
Integration Ecosystem
Overloop AI Integrations
Overloop AI connects with: HubSpot, Salesforce, Pipedrive, Zapier, Slack, Calendly, Gmail, Outlook.
TheirStack Integrations
TheirStack connects with: Clay, LinkedIn Audiences, Make, N8N, Zapier.
Shared Integrations
Both tools integrate with: Zapier.
Integrations listed only by Overloop AI: HubSpot, Salesforce, Pipedrive, Slack, Calendly, Gmail, Outlook.
Integrations listed only by TheirStack: Clay, LinkedIn Audiences, Make, N8N.
Use Case Recommendations
Best Fit for Overloop AI
- Teams that need a wide feature set (10 capabilities listed)
- Organizations with complex tech stacks needing broad integration support (8 integrations)
- 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 | Overloop AI | TheirStack |
|---|---|---|
| Starting Price | $69/mo | Free |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 10 | 8 |
| Integrations | 8 | 5 |
| Founded | 2015 | 2021 |
Getting Started Checklist
- Define your multi-channel sales outreach and engagement tracking and B2B lead data and contact enrichment requirements and monthly budget
- Estimate your expected sequences and engagement actions and 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
Overloop AI serves the multi-channel sales outreach and engagement tracking side of an outbound stack and TheirStack the B2B lead data and contact enrichment side. TheirStack offers a more accessible entry point, while Overloop AI starts at $69/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 Overloop AI and TheirStack for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Overloop AI and TheirStack?
- Overloop AI is a sales engagement platform for multi-channel outreach and engagement tracking, while TheirStack is a data enrichment tool for B2B lead and company data. TheirStack finds companies by the technologies they use and the roles they are hiring for, while Overloop AI runs personalized email and social campaigns from its own contact database.
- How much does each platform cost?
- Overloop AI starts at $69/mo for its Starter plan with 250 credits per user, rising to $99/mo for Growth, with Enterprise available on request. TheirStack has a free tier with 50 company credits and 200 API credits per month, plus a $49/mo API, Webhooks and MCP plan and a usage-based App plan.
- Which integrations does each tool support?
- Overloop AI integrates with HubSpot, Salesforce, Pipedrive, Zapier, Slack, Calendly, Gmail, and Outlook. TheirStack integrates with Clay, LinkedIn Audiences, Make, N8N, and Zapier. Zapier is the only integration listed by both platforms.
- Which tool is better for budget-conscious teams?
- TheirStack fits budget-conscious teams better since it offers a free entry tier with 50 company credits and 200 API credits per month, compared to Overloop AI's lowest tier at $69/mo for the Starter plan.
- Can teams use both Overloop AI and TheirStack together?
- Yes, many teams run both since they cover different parts of the outbound workflow. Overloop AI handles multichannel outreach and engagement tracking, while TheirStack handles data enrichment and lead sourcing by technology and hiring activity.
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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