GMass vs MailToaster: Cold Email Platform vs Email Warmup Tool Comparison
Compare GMass (cold email platform) and MailToaster (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 built for sending campaigns inside Gmail, while MailToaster is an email warmup tool built for building and repairing sender reputation. GMass starts at $29.95/mo across 4 tiers, MailToaster starts at $29/mo with a single plan. Many teams run both together rather than choosing one.
Key takeaways
- GMass Standard plan starts at $29.95/mo with unlimited emails, contacts, and campaigns, subject to Gmail limits.
- MailToaster's Email Warm-up plan starts at $29/mo, priced per email account per month.
- GMass offers 4 pricing tiers, ranging up to $175/mo for its Teams plan with 5 users, while MailToaster offers only 1 tier.
- GMass lists 10 features on its own site, including mail merge personalization, A/B testing, and a Spam Solver deliverability tool.
- GMass integrates with Gmail, Google Sheets, Zapier, and Google Workspace, while MailToaster integrates with Gmail, GSuite, and Outlook.
Reviewed and updated September 2, 2026
GMass vs MailToaster: Cold Email Platform vs Email Warmup Tool Comparison
Sales teams building an outbound stack often weigh GMass, a cold email platform for cold email outreach, against MailToaster, an email warmup tool for email domain warming and deliverability. 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
GMass is a cold email platform for cold email outreach; MailToaster 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 MailToaster lists 100% automated email warm-up process and trusted network of real inboxes for extra security.
MailToaster 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 MailToaster. 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.
MailToaster is Automated email warm-up service that builds, maintains and repairs sender reputation using peer-to-peer sending across a network of real inboxes. Warm-up profiles let you choose whether to build, maintain or repair reputation, and the system opens, replies to and removes messages from spam on your behalf.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Standard
Email Warm-up
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
MailToaster Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Email Warm-up | $29/mo | Email account / month | Not published; volume is managed by the warm-up profile |
Source: MailToaster Pricing
Pricing Analysis
MailToaster 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 MailToaster's 1, 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
- 100% automated email warm-up process
- Trusted network of real inboxes for extra security
- Positive engagement with your emails
- Available for GSuite and Outlook
- Multiple warm-up profiles to meet your current needs
- Filtering for warm-up emails in your Inbox
- and 2 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
MailToaster Key Features
- 100% automated email warm-up process
- Trusted network of real inboxes for extra security
- Positive engagement with your emails
- Available for GSuite and Outlook
- Multiple warm-up profiles to meet your current needs
- Filtering for warm-up emails in your Inbox
- Auto-generated texts and templates for warm-up emails
- Detailed reports for progress tracking
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 MailToaster
- 100% automated email warm-up process
- Trusted network of real inboxes for extra security
- Positive engagement with your emails
- Available for GSuite and Outlook
- Multiple warm-up profiles to meet your current needs
- Filtering for warm-up emails in your Inbox
- Auto-generated texts and templates for warm-up emails
- Detailed reports for progress tracking
Integration Ecosystem
GMass Integrations
GMass connects with: Gmail, Google Sheets, Zapier, Google Workspace.
MailToaster Integrations
MailToaster connects with: Gmail, GSuite, Outlook.
Shared Integrations
Both tools integrate with: Gmail.
Integrations listed only by GMass: Google Sheets, Zapier, Google Workspace.
Integrations listed only by MailToaster: GSuite, Outlook.
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)
- Organizations with complex tech stacks needing broad integration support (4 integrations)
Best Fit for MailToaster
- Budget-conscious teams looking for an affordable email warmup tool
- Teams launching new email domains for outreach
- Organizations recovering from deliverability issues
- Agencies managing warmup across multiple client domains
Feature Comparison Summary
| Feature | GMass | MailToaster |
|---|---|---|
| Starting Price | $29.95/mo | $29/mo |
| Top Tier Price | $175/mo | $29/mo |
| Total Features Listed | 10 | 8 |
| Integrations | 4 | 3 |
| 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 MailToaster the email domain warming and deliverability side. MailToaster 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 MailToaster for current information.
Frequently asked questions.
Frequently asked questions- What is the difference between GMass and MailToaster?
- GMass is a cold email platform for sending outbound campaigns and mail merge from inside Gmail, while MailToaster is an email warmup tool focused on building and maintaining sender reputation. GMass handles the sending and campaign side of outreach, while MailToaster works in the background to improve inbox placement before and during outreach.
- Which is cheaper, GMass or MailToaster?
- MailToaster has the lower entry price at $29/mo compared to GMass's Standard plan at $29.95/mo. GMass offers 4 pricing tiers up to $175/mo for a 5-user Teams plan, while MailToaster publishes only 1 plan, so the pricing structures aren't directly comparable beyond the entry tier.
- Can I use GMass and MailToaster together?
- Yes, the article notes that many teams run one of each tool since they cover different parts of the outbound workflow. GMass handles sending cold email campaigns, while MailToaster runs in parallel to warm up and protect the sending domain's reputation.
- What integrations does MailToaster support?
- MailToaster connects with Gmail, GSuite, and Outlook. This is a narrower integration list than GMass, which also connects with Google Sheets, Zapier, and Google Workspace, with Gmail being the integration shared by both tools.
- Does GMass work with Gmail specifically?
- Yes, GMass is built to work inside Gmail and is described as a Gmail-based mass email and mail merge platform. It offers unlimited emails, campaigns, and contacts directly within Gmail, subject to Gmail's own sending limits.
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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