GMass vs Mailivery: Cold Email Platform vs Email Warmup Tool Comparison
Compare GMass (cold email platform) and Mailivery (email warmup tool) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
GMass is a cold email platform for outreach inside Gmail with unlimited emails, contacts, and campaigns, while Mailivery is an email warmup tool focused on inbox placement and sender reputation through a peer to peer mailbox network. GMass starts at $29.95/mo, Mailivery at $29/mo. They serve different parts of the workflow, and many teams use both.
Key takeaways
- GMass entry pricing is $29.95/mo for the Standard plan, offering unlimited contacts and unlimited emails subject to Gmail limits.
- Mailivery entry pricing is $29 per month for the Starter plan, which includes unlimited mailboxes and 200 shared warm-up emails per day.
- GMass offers four pricing tiers (Standard, Premium, Professional, Teams) while Mailivery offers three (Starter, Professional, Business).
- Mailivery's Business plan costs $199/mo and includes 2,500 shared warm-up emails per day.
- Both tools integrate with Gmail, but GMass also connects to Google Sheets, Zapier, and Google Workspace, while Mailivery connects to GSuite, Microsoft 365, SMTP, and SendGrid.
Reviewed and updated September 2, 2026
GMass vs Mailivery: Cold Email Platform vs Email Warmup Tool Comparison
GMass is a cold email platform; Mailivery is an email warmup tool. 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, email domain warming and deliverability on the other. This guide lays out what each vendor publishes.
The Quick Answer
GMass is a cold email platform for cold email outreach; Mailivery is an email warmup tool for email domain warming and deliverability. By each vendor's own wording, GMass lists works inside gmail and unlimited emails, contacts, and campaigns, and Mailivery lists email warm up and inbox placement test.
Mailivery offers a lower entry point at $29/mo compared to GMass at $29.95/mo.
If your priority is sending campaigns that land in the inbox and generate replies, GMass is the one built for it; for building sender reputation and improving inbox placement, that is Mailivery. 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.
Mailivery is Email warm-up and deliverability tool that improves sender reputation by holding real conversations in your inbox through a peer to peer network of active mailboxes. Plans are priced on total daily warm-up volume and allow unlimited connected mailboxes, with inbox placement tests, blacklist monitoring and email verification included.
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
Mailivery Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Starter | $29/mo | UNLIMITED mailboxes | 200 warm-up emails / day (shared) |
| Professional | $79/mo | UNLIMITED mailboxes | 800 warm-up emails / day (shared) |
| Business | $199/mo | UNLIMITED mailboxes | 2,500 warm-up emails / day (shared) |
Source: Mailivery Pricing
Pricing Analysis
Mailivery offers the lower entry point ($29/mo vs $29.95/mo). Teams watching their budget will appreciate the savings, especially when starting out.
GMass offers 4 pricing tiers compared to Mailivery'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
- Email Warm Up
- Inbox Placement Test
- Blacklist Monitoring
- Email Verification
- Custom Warm Up Templates
- Real email text & AI generated email content
- and 3 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
Mailivery Key Features
- Email Warm Up
- Inbox Placement Test
- Blacklist Monitoring
- Email Verification
- Custom Warm Up Templates
- Real email text & AI generated email content
- Email scheduling & balancing to mimic natural behavior
- Peer2Peer interactions
- Automatic email reading and moving so that we don't jam your inbox
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 Mailivery
- Email Warm Up
- Inbox Placement Test
- Blacklist Monitoring
- Email Verification
- Custom Warm Up Templates
- Real email text & AI generated email content
- Email scheduling & balancing to mimic natural behavior
- Peer2Peer interactions
- Automatic email reading and moving so that we don't jam your inbox
Integration Ecosystem
GMass Integrations
GMass connects with: Gmail, Google Sheets, Zapier, Google Workspace.
Mailivery Integrations
Mailivery connects with: Gmail, GSuite, Microsoft 365, SMTP, SendGrid.
Shared Integrations
Both tools integrate with: Gmail.
Integrations listed only by GMass: Google Sheets, Zapier, Google Workspace.
Integrations listed only by Mailivery: GSuite, Microsoft 365, SMTP, SendGrid.
Use Case Recommendations
Best Fit for GMass
- Budget-conscious teams looking for an affordable cold email platform
- Teams that need a wide feature set (10 capabilities listed)
- Sales teams running high-volume outbound email campaigns
- Agencies managing multiple client outreach programs
Best Fit for Mailivery
- Budget-conscious teams looking for an affordable email warmup tool
- Organizations with complex tech stacks needing broad integration support (5 integrations)
- Teams launching new email domains for outreach
- Organizations recovering from deliverability issues
Feature Comparison Summary
| Feature | GMass | Mailivery |
|---|---|---|
| Starting Price | $29.95/mo | $29/mo |
| Top Tier Price | $175/mo | $199/mo |
| Total Features Listed | 10 | 9 |
| Integrations | 4 | 5 |
| Founded | 2015 | N/A |
Getting Started Checklist
- Define your cold email outreach and email domain warming and deliverability requirements and monthly budget
- Estimate your expected email sending volume and warmup email volume 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 Mailivery the email domain warming and deliverability side. Mailivery offers a more accessible entry point at $29/mo, while GMass starts at $29.95/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 Mailivery for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between GMass and Mailivery?
- GMass is a Gmail-based mass email and mail merge platform built for cold email outreach, while Mailivery is an email warmup and deliverability tool that improves sender reputation through a peer to peer network of active mailboxes. They address different parts of the outbound email workflow rather than competing directly.
- Which tool is cheaper, GMass or Mailivery?
- Mailivery has the lower entry price at $29/mo compared to GMass's $29.95/mo Standard plan. The difference at the entry tier is small, but GMass offers more pricing tiers overall, four compared to Mailivery's three, giving teams more granularity as they scale.
- Can I use GMass and Mailivery together?
- Yes, the article notes that many teams run one of each since they solve different problems: GMass for sending cold email campaigns that land in the inbox and generate replies, and Mailivery for building sender reputation and improving inbox placement before or during outreach.
- What integrations does GMass support compared to Mailivery?
- GMass integrates with Gmail, Google Sheets, Zapier, and Google Workspace. Mailivery integrates with Gmail, GSuite, Microsoft 365, SMTP, and SendGrid. The only integration both tools share, based on each vendor's own listed integrations, is Gmail.
- What features does Mailivery offer that GMass does not list?
- Mailivery lists features such as Email Warm Up, Inbox Placement Test, Blacklist Monitoring, Custom Warm Up Templates, AI generated email content, email scheduling and balancing to mimic natural behavior, Peer2Peer interactions, and automatic email reading and moving to avoid jamming the inbox.
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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