GMass vs MailRush.io: Cold Email Platform Comparison
Compare GMass and MailRush.io side by side. See pricing, features, and integrations to choose the right cold email platform for your needs.
GMass and MailRush.io are both cold email platforms, but they differ in approach: GMass is a Gmail-based mass email and mail merge tool with unlimited emails, contacts, and campaigns starting at $29.95/mo, while MailRush.io automates outreach from SMTP/IMAP mailboxes with unlimited senders and warmup included, starting at $19/mo.
Key takeaways
- GMass starts at $29.95/mo for its Standard plan while MailRush.io starts at $19/mo for its Starter plan.
- GMass offers 4 pricing tiers up to $175/mo for Teams, while MailRush.io offers 3 tiers up to $99/mo for Scale.
- MailRush.io's Starter plan caps contacts at 1,000 and emails at 5,000 per month, while GMass lists unlimited contacts and emails subject to Gmail limits.
- GMass lists 10 features on its own page compared to MailRush.io's 11 listed features.
- GMass integrates with Gmail, Google Sheets, Zapier, and Google Workspace, while MailRush.io integrates with SMTP, IMAP, Zapier, and Webhooks, with Zapier as the only shared integration.
Reviewed and updated September 2, 2026
GMass vs MailRush.io: Cold Email Platform Comparison
GMass and MailRush.io are both cold email platforms. Choosing between them depends on your team size, budget, and specific cold email outreach requirements. Here is what each vendor publishes about pricing, features, and integrations.
The Quick Answer
By each vendor's own wording, GMass lists works inside gmail and unlimited emails, contacts, and campaigns, while MailRush.io lists unlimited senders and unlimited email warming. A capability both offer can appear under different names, so read both feature lists below.
MailRush.io offers a lower entry point at $19/mo compared to GMass at $29.95/mo.
If your priority is sending campaigns that land in the inbox and generate replies, both tools target it. The right choice depends on your budget, team size, and the specific capabilities you need most.
Understanding the Core Difference
GMass is Gmail-based mass email and mail merge platform with unlimited emails, campaigns, and contacts directly inside Gmail.
MailRush.io is Cold email software that automates outreach and multi-step follow-ups from your own SMTP/IMAP mailboxes or MailRush-provided sending accounts. Email warmup and email validation are included in every plan.
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
MailRush.io Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Starter | $19/mo | Up to 1,000 contacts | Up to 5,000 emails per month; up to 1,000 emails per day |
| Pro | $39/mo | Up to 30,000 contacts | Up to 10,000 emails per month; up to 1,500 emails per day |
| Scale | $99/mo | Up to 50,000 contacts | Up to 25,000 emails per month; up to 3,000 emails per day |
Source: MailRush.io Pricing
Pricing Analysis
MailRush.io offers the lower entry point ($19/mo vs $29.95/mo). Teams watching their budget will appreciate the savings, especially when starting out.
GMass offers 4 pricing tiers compared to MailRush.io'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
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- and 5 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
MailRush.io Key Features
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- Email follow-ups
- Suppression list
- Email copy spam assessment
- Email personalization
- Unsubscription automation
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 MailRush.io
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- Email follow-ups
- Suppression list
- Email copy spam assessment
- Email personalization
- Unsubscription automation
Integration Ecosystem
GMass Integrations
GMass connects with: Gmail, Google Sheets, Zapier, Google Workspace.
MailRush.io Integrations
MailRush.io connects with: SMTP, IMAP, Zapier, Webhooks.
Shared Integrations
Both tools integrate with: Zapier.
Integrations listed only by GMass: Gmail, Google Sheets, Google Workspace.
Integrations listed only by MailRush.io: SMTP, IMAP, Webhooks.
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 MailRush.io
- Budget-conscious teams looking for an affordable cold email platform
- Teams that need a wide feature set (11 capabilities listed)
- Sales teams running high-volume outbound email campaigns
- Agencies managing multiple client outreach programs
Feature Comparison Summary
| Feature | GMass | MailRush.io |
|---|---|---|
| Starting Price | $29.95/mo | $19/mo |
| Top Tier Price | $175/mo | $99/mo |
| Total Features Listed | 10 | 11 |
| Integrations | 4 | 4 |
| Founded | 2015 | N/A |
Getting Started Checklist
- Define your cold email outreach requirements and monthly budget
- Estimate your expected email sending 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 and MailRush.io both serve the cold email outreach market. MailRush.io offers a more accessible entry point at $19/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 MailRush.io for current information.
Frequently asked questions.
Frequently asked questions- Which is cheaper, GMass or MailRush.io?
- MailRush.io has the lower entry price at $19/mo compared to GMass at $29.95/mo. At the top tier, GMass's Teams plan costs $175/mo while MailRush.io's Scale plan costs $99/mo.
- What is the main difference between GMass and MailRush.io?
- GMass is a Gmail-based mass email and mail merge platform that works directly inside Gmail with unlimited emails, contacts, and campaigns. MailRush.io automates outreach and multi-step follow-ups from your own SMTP or IMAP mailboxes, or MailRush-provided accounts, with email warmup and validation included in every plan.
- Does GMass work outside of Gmail?
- The article describes GMass specifically as a platform that works inside Gmail, listing this as one of its core features. It is built around Gmail-based mass email and mail merge functionality.
- Which tool has more features, GMass or MailRush.io?
- MailRush.io lists 11 total features compared to GMass's 10, according to the feature comparison summary in the article. However, feature lists differ by exact vendor wording, so some capabilities offered by both may appear under different names on each list.
- What integrations do GMass and MailRush.io support?
- GMass integrates with Gmail, Google Sheets, Zapier, and Google Workspace. MailRush.io integrates with SMTP, IMAP, Zapier, and Webhooks. Zapier is the only integration both platforms share.
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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