GMass Review: Mail Merge That Lives Inside Gmail
GMass suits Gmail senders who value ease of use over price levelIn this GMass review, price level draws 58 negative mentions and the learning curve draws 56.
Every score on this page validated by the site owner · latest validation Oct 16, 2026 · How we score
GMass in three sentences
GMass sends campaigns from inside the Gmail Compose window, per its home page. Scores rest on 104 tagged reviews, and ease of use has 269 favourable mentions. Price level draws 58 negative mentions, and the learning curve 56.
See it before you read on
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What it costs
Four plans. Every figure read on the vendor's pricing page on Oct 4, 2026.
Spotted a change? Tell us
Prices read on the vendor's page: Standard $29.95, Premium $39.95, Professional $59.95 a month.
Scores calculated on 104 tagged reviews; global score 7.5.
What you get, what you don't
Six things GMass does. None of the six is missing on the vendor's pages; the weak spots are in what reviewers say, below.
- Google SheetsNative
- ZapierNative
- Data hostedNot published
- GDPR data processing agreementNot published
- SOC 2 reportNot published
- Single sign-onNot published
- ChannelsSupport form
- HoursNot published
- PhoneNot published
- Read as negative12 of 24 tagged reviews
The data behind the score
Our five scores against the average of the tools we score.
Should you buy it?
Name your dealbreaker. No profile is scored on its own yet: too few tagged reviews per profile, so the page shows the overall score.
Buy it if You send campaigns from Gmail and want ease of use, reporting and follow-ups. Skip it if You put price level or a short learning curve first.
Price level draws 58 negative mentions Price level draws 58 negative mentions, and 13 of the 68 tagged reviews that discuss value read as negative; Standard is $29.95 a month, read on Oct 4, 2026. We hold no published fact that shows another tool here does better.
The learning curve draws 56 negative mentions Learning curve draws 56 negative mentions among its 63 mentions, and 4 favourable; ease of use has 269 favourable mentions and no negative one. We hold no published fact that shows another tool here does better.
Feature range draws 25 negative mentions Feature range draws 25 negative mentions among its 46 mentions, and 17 favourable; 17 of the 91 tagged reviews that discuss feature depth read as negative. We hold no published fact that shows another tool here does better.
19 of the 27 deliverability mentions are negative Deliverability draws 19 negative mentions among its 27 mentions, and 8 favourable; 6 of the 17 tagged reviews that discuss it read as negative. We hold no published fact that shows another tool here does better.
Questions to ask the vendor
- What help does GMass give new users with its learning curve?The learning curve draws 56 negative mentions of GMass.
- How does GMass decide when delivery moves from native Gmail to SMTP?The home page says delivery shifts as the audience grows; deliverability draws 19 negative mentions.
- What does unlimited emails cover when Gmail caps what one account sends?Plan cards list unlimited emails with an asterisk; Gmail's limits are 500 and 2,000 a day.
- What does a Team plan cost for more than 5 users?Premium (Team) is $175 a month for 5 users; this page lists no price for other sizes.
If GMass isn't it
Three tools we score in this category. Each card names where the tool is weaker. Price level, Learning curve, Feature range and Deliverability have no card: we hold no published fact that shows another tool here does better. Click a card, or a name below, to put it next to GMass.
- A/B testing on Starter, $29 per user a month; email rotation on Email Outreach, $49
- No free trial, against GMass's 7-day trial
- 14-day free trial, against GMass's 7-day trial
- Learning curve draws 28 negative mentions
- Inbox rotation on Professional, $26.99 per user a month, billed annually
- Professional covers 60,000 emails a month, where GMass lists unlimited emails with an asterisk
GMass vs Mailshakethe three alternatives
 GMass |
Mailshake |
Reply.io |
Mailmeteor |
|
|---|---|---|---|---|
| Our score | 7.5 | 8.8 | 8.6 | 7.7 |
| Price and plan | ||||
| Entry price | $29.95 /mo | $29 /seat /mo | From $89 /seat /mo billed annually | $4.49 /seat /mo billed annually |
| Free plan | No free plan stated | No free plan stated | No free plan stated | Free plan |
| Free trial | 7-day free trial | No free trial | 14-day free trial | No free trial stated |
| Four dimensions, same grid | ||||
| Ease of setup | 8.5 | 9.0 | 8.7 | 10.0 |
| Feature depth | 7.7 | 7.7 | 8.3 | 5.9 |
| Value for money | 8.3 | 8.8 | 9.7 | 8.1 |
| Support quality | 5.9 | 9.2 | 9.6 | 8.0 |
| Fit | ||||
| Native integrations | Google Sheets, Zapier | Salesforce, Pipedrive, HubSpot | HubSpot, Salesforce, Pipedrive, Copper | Zapier |
| Support channels | Support form | Chat, email | Ticket form | |
| Main strength | Campaigns sent from inside Gmail | Email sequences with built-in warm-up | Built-in email warm-up | Gmail and Outlook mail merge |
Mailshake scores 8.8 on 85 tagged reviews. Its Sales Engagement plan lists 5 phone numbers and unlimited free dialer minutes to North America, read on Oct 4, 2026.
Reply.io scores 8.6 on 30 tagged reviews. It lists conditional branches in sequences, read on Oct 17, 2026.
Mailmeteor scores 7.7 on 61 tagged reviews. It lists mail merge from Gmail, Outlook, Excel, Sheets and Docs, read on Sep 27, 2026.
Read on Oct 4, 2026: GMass Standard $29.95 a month and Mailshake Starter $29 per user a month, both billed monthly; Mailmeteor Starter $4.49 per user a month, billed annually.
Same five-dimension grid for every tool; the fifth dimension changes with the category and stays out of this table. Prices and integrations read on each vendor's public pages between Sep 27 and Oct 13, 2026. Some of these prices have not been read again for 6 months. Check the vendors' pages before you buy.
What the reviews say, in depth
Ease of use draws 269 favourable mentions
Ease of use has 269 favourable mentions and no negative one. Ease of setup scores 8.5, and 48 of the 76 tagged reviews that discuss setup read as favourable. The vendor's home page says GMass sends campaigns from inside the Gmail Compose window, read on Sep 27, 2026.
The learning curve draws 56 negative mentions and the interface 13.
Plan cards list unlimited emails, with an asterisk
Every GMass plan card lists unlimited emails with an asterisk, read on Oct 4, 2026. The vendor's FAQ gives Gmail's own limits: 500 emails a day for regular accounts and 2,000 for G Suite, read on Oct 4, 2026.
Inbox Rotation (MultiSend) is listed on the Professional plan, read on Oct 4, 2026, and on the Premium (Team) plan, read on Sep 27, 2026.
Deliverability draws 19 negative mentions
Deliverability has 27 mentions: 19 negative and 8 favourable. The Deliverability dimension scores 7.1; 11 of the 17 tagged reviews that discuss it read as favourable and 6 as negative. The home page says delivery shifts from native Gmail to inbox rotation and SMTP as the audience grows, read on Oct 4, 2026.
This GMass review keeps two counts apart: mentions of the deliverability theme, and tagged reviews that discuss the Deliverability dimension.
Support scores 5.9 on 24 tagged reviews
10 of the 24 tagged reviews that discuss support read as favourable, and customer support draws 5 negative mentions against 8 favourable mentions. The vendor lists a support form, plus email support on Standard and high-priority support on Professional, read on Sep 27, 2026.
Individual plans: $29.95 to $59.95 a month, billed monthly
Standard is $29.95 a month, Premium $39.95 and Professional $59.95, read on the vendor's pricing page on Oct 4, 2026; billed annually they read $20, $29 and $49 a month. Price level draws 58 negative mentions, and 13 of the 68 tagged reviews that discuss value read as negative. Billing and renewals draw 8 negative mentions.
The Premium (Team) plan is $175 a month for 5 users, or $145 a month billed annually, read on Oct 4, 2026.
Before you commit
The pricing page lists no free plan, read on Sep 27, 2026. Standard is $29.95 a month, Premium $39.95 and Professional $59.95. The vendor's FAQ states a 7-day free trial that allows 50 emails a day.
The vendor's FAQ gives Gmail's own limits: 500 emails a day for regular Gmail accounts and 2,000 for G Suite, read on Oct 4, 2026. Every plan card lists unlimited emails with an asterisk.
The site makes no comparison with a dedicated sender. Deliverability scores 7.1 from 17 tagged reviews: 11 favourable and 6 negative, and the theme draws 19 negative mentions among 27.
The tagged reviews hold 4 mentions of account safety, all 4 negative. Gmail's own daily limits, which the vendor's FAQ gives, are in the sending-limits section above.
The site holds no per-volume SMTP price for GMass. Every plan card lists unlimited emails with an asterisk, and the plans differ by feature: Standard is $29.95 a month and Professional $59.95, read on Oct 4, 2026.
The site holds no response time for GMass. Support quality scores 5.9, and 10 of the 24 tagged reviews that discuss support read as favourable; customer support draws 5 negative mentions. The vendor lists a support form, read on Sep 27, 2026.
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