Overloop AI vs Seamless.AI: Sales Engagement Platform vs Data Enrichment Tool Comparison
Compare Overloop AI (sales engagement platform) and Seamless.AI (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 built for multi-channel outreach and campaign tracking, starting at $69/mo, while Seamless.AI is a data enrichment tool for B2B contact search and lookups, starting free. They solve different problems in the outbound stack, so many teams use both rather than choosing one over the other.
Key takeaways
- Overloop AI's Starter plan costs $69/mo and includes 250 credits per user per month, one email account per user, and 3 campaigns.
- Seamless.AI offers a Free plan with 50 credits, making it the lower entry point compared to Overloop AI's $69/mo starting price.
- Overloop AI's database is described as 450M+ prospects, while Seamless.AI is described as a real-time B2B contact search engine.
- Both platforms share integrations with HubSpot, Salesforce, Pipedrive, and Zapier, but Overloop AI adds Slack, Calendly, Gmail, and Outlook while Seamless.AI adds Outreach, SalesLoft, and Microsoft Dynamics 365.
- Overloop AI's Growth plan costs $99/mo with 500 credits per user per month, 3 email accounts per user, and 10 campaigns.
Reviewed and updated September 2, 2026
Overloop AI vs Seamless.AI: Sales Engagement Platform vs Data Enrichment Tool Comparison
Overloop AI is a sales engagement platform; Seamless.AI is a data enrichment tool. Whether you need one, the other, or both depends on which part of the workflow you are buying for: multi-channel sales outreach and engagement tracking on one side, B2B lead data and contact enrichment on the other. This guide lays out what each vendor publishes.
The Quick Answer
Overloop AI is a sales engagement platform for multi-channel sales outreach and engagement tracking; Seamless.AI 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 Seamless.AI lists real-time b2b contact search engine and email and cell phone lookups.
Seamless.AI 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 Seamless.AI. 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.
Seamless.AI is AI-powered sales lead platform with real-time contact search engine, pitch intelligence, and data enrichment for B2B prospecting.
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
Seamless.AI Pricing (as of September 2026)
| Plan | Price | Contacts |
|---|---|---|
| Free | Free | 50 Credits |
| Pro | Contact Sales | Annual Credit Packages |
| Enterprise | Contact Sales | Custom Packages |
Source: Seamless.AI Pricing
Pricing Analysis
Seamless.AI offers the lower entry point ($0/mo vs $69/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Seamless.AI 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
- Real-time B2B contact search engine
- Email and cell phone lookups
- Pitch intelligence
- Data enrichment
- Buyer intent data (add-on)
- Job changes tracking (add-on)
- and 4 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
Seamless.AI Key Features
- Real-time B2B contact search engine
- Email and cell phone lookups
- Pitch intelligence
- Data enrichment
- Buyer intent data (add-on)
- Job changes tracking (add-on)
- Autopilot list building (add-on)
- AI writing assistant
- Chrome extension
- Enterprise security and compliance
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 Seamless.AI
- Real-time B2B contact search engine
- Email and cell phone lookups
- Pitch intelligence
- Data enrichment
- Buyer intent data (add-on)
- Job changes tracking (add-on)
- Autopilot list building (add-on)
- AI writing assistant
- Chrome extension
- Enterprise security and compliance
Integration Ecosystem
Overloop AI Integrations
Overloop AI connects with: HubSpot, Salesforce, Pipedrive, Zapier, Slack, Calendly, Gmail, Outlook.
Seamless.AI Integrations
Seamless.AI connects with: Salesforce, HubSpot, Outreach, SalesLoft, Pipedrive, Microsoft Dynamics 365, Zapier.
Shared Integrations
Both tools integrate with: HubSpot, Salesforce, Pipedrive, Zapier.
Integrations listed only by Overloop AI: Slack, Calendly, Gmail, Outlook.
Integrations listed only by Seamless.AI: Outreach, SalesLoft, Microsoft Dynamics 365.
Use Case Recommendations
Best Fit for Overloop AI
- Organizations with complex tech stacks needing broad integration support (8 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
- SDR teams running multi-channel outreach sequences
- Sales managers tracking team engagement metrics
Best Fit for Seamless.AI
- 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 | Seamless.AI |
|---|---|---|
| Starting Price | $69/mo | Free |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 10 | 10 |
| Integrations | 8 | 7 |
| Founded | 2015 | 2015 |
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 Seamless.AI the B2B lead data and contact enrichment side. Seamless.AI 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 Seamless.AI for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Overloop AI and Seamless.AI?
- Overloop AI is a sales engagement platform for coordinating multi-channel outreach across email and social, while Seamless.AI is a data enrichment tool focused on finding and verifying B2B contact data. They address different parts of the outbound process, so teams often use both together rather than treating them as interchangeable options.
- Which tool is cheaper, Overloop AI or Seamless.AI?
- Seamless.AI has the lower entry point with a Free plan that includes 50 credits, while Overloop AI's cheapest plan, Starter, costs $69/mo for 250 credits per user per month. Seamless.AI's paid tiers, Pro and Enterprise, require contacting sales for custom pricing.
- Do Overloop AI and Seamless.AI integrate with the same tools?
- They share four integrations: HubSpot, Salesforce, Pipedrive, and Zapier. Beyond that, Overloop AI uniquely connects with Slack, Calendly, Gmail, and Outlook, while Seamless.AI uniquely connects with Outreach, SalesLoft, and Microsoft Dynamics 365.
- Is Overloop AI good for enterprise sales teams?
- Yes, Overloop AI is suited to organizations with complex tech stacks that need broad integration support across its 8 listed integrations. It also fits enterprise buyers who prefer custom pricing and dedicated support, as well as SDR teams running multi-channel outreach sequences and sales managers tracking engagement metrics.
- What features does Seamless.AI offer that Overloop AI does not list?
- Seamless.AI lists pitch intelligence, data enrichment, buyer intent data as an add-on, job changes tracking as an add-on, autopilot list building as an add-on, an AI writing assistant, and enterprise security and compliance. These appear only on Seamless.AI's own feature list, not on Overloop AI's.
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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