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Mailmeteor vs GMass: catalog facts
Mailmeteor	GMass
Freemium Free plan available, with paid plans for more features.	Freemium Paid plans are offered; check the developer's site for current pricing and free limits.
Web, Browser extension	Web, Browser extension
Mail merge directly from Gmail, Outlook and Google Sheets Open tracking and deliverability safeguards	Works inside Gmail with no separate mail platform Unlimited automatic follow-up stages
Sending volume is bounded by quotas and provider limits Requires connecting your email account to the service	Tied to Gmail and Google Workspace accounts Chrome extension only, according to the research
Hosted service, Browser extension	Browser extension
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.