GMass vs Overloop AI: Cold Email Platform vs Sales Engagement Platform Comparison
Compare GMass (cold email platform) and Overloop AI (sales engagement platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
GMass is a Gmail-based cold email platform starting at $29.95 per month with unlimited emails, contacts, and campaigns. Overloop AI is a sales engagement platform starting at $69 per month with a 450M+ prospect database and multichannel outreach across email and social. GMass fits pure cold email needs, Overloop AI fits broader multi-channel sales engagement, and many teams run both.
Key takeaways
- GMass entry pricing starts at $29.95 per month for the Standard plan, while Overloop AI's Starter plan starts at $69 per month.
- GMass offers four pricing tiers (Standard, Premium, Professional, Teams) compared to Overloop AI's three (Starter, Growth, Enterprise).
- Overloop AI lists a 450M+ prospects database, AI-powered campaigns, and a Chrome Extension for LinkedIn among its key features.
- GMass lists features such as working inside Gmail, unlimited emails and contacts, mail merge personalization, and a Spam Solver deliverability tool.
- Both platforms integrate with Gmail and Zapier, but Overloop AI additionally connects with HubSpot, Salesforce, Pipedrive, Slack, Calendly, and Outlook, while GMass additionally connects with Google Sheets and Google Workspace.
Reviewed and updated September 2, 2026
GMass vs Overloop AI: Cold Email Platform vs Sales Engagement Platform Comparison
GMass is a cold email platform; Overloop AI is a sales engagement platform. Whether you need one, the other, or both depends on which part of the workflow you are buying for: cold email outreach on one side, multi-channel sales outreach and engagement tracking on the other. This guide lays out what each vendor publishes.
The Quick Answer
GMass is a cold email platform for cold email outreach; Overloop AI is a sales engagement platform for multi-channel sales outreach and engagement tracking. By each vendor's own wording, GMass lists works inside gmail and unlimited emails, contacts, and campaigns, and Overloop AI lists ai-powered campaigns and 450m+ prospects database.
GMass offers a lower entry point at $29.95/mo compared to Overloop AI at $69/mo.
If your priority is sending campaigns that land in the inbox and generate replies, GMass is the one built for it; for coordinating outreach across email, phone, and social channels, that is Overloop AI. Many teams run one of each.
Understanding the Core Difference
GMass is Gmail-based mass email and mail merge platform with unlimited emails, campaigns, and contacts directly inside Gmail.
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.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Standard
Starter
GMass Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Standard | $29.95/mo | Unlimited | Unlimited (Gmail limits apply) |
| Premium | $39.95/mo | Unlimited | Unlimited (Gmail limits apply) |
| Professional | $59.95/mo | Unlimited | Unlimited (Gmail limits apply) |
| Teams (5 users) | $175/mo | Unlimited | Unlimited (Gmail limits apply) |
Source: GMass Pricing
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
Pricing Analysis
GMass is more affordable at the entry level ($29.95/mo vs $69/mo). For teams with tight budgets or those just getting started with cold email outreach and multi-channel sales outreach and engagement tracking, this price difference matters.
GMass offers 4 pricing tiers compared to Overloop AI's 3, giving you more granularity as you scale.
Features Breakdown
- Works inside Gmail
- Unlimited emails, contacts, and campaigns
- Mail merge personalization
- Free email verification
- Automated follow-up sequences
- A/B testing
- and 4 more listed below
- 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
GMass Key Features
- Works inside Gmail
- Unlimited emails, contacts, and campaigns
- Mail merge personalization
- Free email verification
- Automated follow-up sequences
- A/B testing
- Spam Solver deliverability tool
- Custom tracking links
- Inbox rotation
- API and Zapier access
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
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 GMass
- Works inside Gmail
- Unlimited emails, contacts, and campaigns
- Mail merge personalization
- Free email verification
- Automated follow-up sequences
- A/B testing
- Spam Solver deliverability tool
- Custom tracking links
- Inbox rotation
- API and Zapier access
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
Integration Ecosystem
GMass Integrations
GMass connects with: Gmail, Google Sheets, Zapier, Google Workspace.
Overloop AI Integrations
Overloop AI connects with: HubSpot, Salesforce, Pipedrive, Zapier, Slack, Calendly, Gmail, Outlook.
Shared Integrations
Both tools integrate with: Gmail, Zapier.
Integrations listed only by GMass: Google Sheets, Google Workspace.
Integrations listed only by Overloop AI: HubSpot, Salesforce, Pipedrive, Slack, Calendly, Outlook.
Use Case Recommendations
Best Fit for GMass
- Budget-conscious teams looking for an affordable cold email platform
- Sales teams running high-volume outbound email campaigns
- Agencies managing multiple client outreach programs
- SDR teams focused on pipeline generation
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
Feature Comparison Summary
| Feature | GMass | Overloop AI |
|---|---|---|
| Starting Price | $29.95/mo | $69/mo |
| Top Tier Price | $175/mo | Contact Sales |
| Total Features Listed | 10 | 10 |
| Integrations | 4 | 8 |
| Founded | 2015 | 2015 |
Getting Started Checklist
- Define your cold email outreach and multi-channel sales outreach and engagement tracking requirements and monthly budget
- Estimate your expected email sending volume and sequences and engagement actions 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
GMass serves the cold email outreach side of an outbound stack and Overloop AI the multi-channel sales outreach and engagement tracking side. GMass offers a more accessible entry point at $29.95/mo, 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 GMass and Overloop AI for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between GMass and Overloop AI?
- GMass is a Gmail-based cold email platform built for sending mass email campaigns with mail merge and deliverability tools. Overloop AI is a sales engagement platform built for multi-channel outreach, combining a large prospect database with email and social campaign tools and engagement tracking.
- Which is cheaper, GMass or Overloop AI?
- GMass is cheaper at the entry level, starting at $29.95 per month for its Standard plan, compared to Overloop AI's Starter plan at $69 per month. GMass also offers more pricing tiers, four versus Overloop AI's three, giving more granularity as needs scale.
- Do GMass and Overloop AI integrate with the same tools?
- They share Gmail and Zapier as common integrations. Beyond that, GMass also connects with Google Sheets and Google Workspace, while Overloop AI additionally connects with HubSpot, Salesforce, Pipedrive, Slack, Calendly, and Outlook.
- Can I use both GMass and Overloop AI together?
- Yes, the article notes that many teams run one of each. GMass can handle cold email outreach that lands in the inbox, while Overloop AI coordinates outreach across email, phone, and social channels, so they can complement each other in a stack.
- Which tool is better for high-volume cold email campaigns?
- GMass is positioned for this use case, offering unlimited emails, contacts, and campaigns directly inside Gmail along with features like automated follow-up sequences, A/B testing, and a Spam Solver deliverability tool. It is recommended for budget-conscious teams and sales teams running high-volume outbound email.
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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