GMass: Powerful mail merge for Gmail
A powerful mass email and mail merge system for Gmail.
#1 in CommunicationWhat users praise
- Mail merge and cold outreach right inside Gmail — "a lifesaver", everything managed from your inbox
- MultiSend with inbox rotation protects domain reputation at scale
- Easy for non-technical users; used for years, full of thoughtful touches
What users complain about
- Subscription payments fail for some users (cards declined)
- Occasional re-login needed under corporate policies (Mimecast)
- Advanced features require a paid plan
Compiled from real Chrome Web Store reviews. We only report what users actually wrote — no summaries were invented.
Score breakdown
Reliability1.00
Satisfaction0.87
Usefulness0.70
Safety1.00
Trust0.80
Substance0.85
Strongest: reliability.
Based on 9K reviews · computed Jul 18, 2026. Bars show only what we could actually measure.
What we checked
50recent reviews read
MV3manifest version
0permissions requested
Jun 30, 2026last updated
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