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Mailbutler vs Mailmeteor: catalog facts
Mailbutler	Mailmeteor
Paid Subscription service with a 14-day free trial.	Freemium Free plan available, with paid plans for more features.
macOS, Browser extension	Web, Browser extension
Works inside Apple Mail and Gmail Mail merge with scheduled sending	Mail merge directly from Gmail, Outlook and Google Sheets Open tracking and deliverability safeguards
Email tracking reveals recipient activity, which some recipients object to Requires a subscription after the trial	Sending volume is bounded by quotas and provider limits Requires connecting your email account to the service
Downloadable app, Browser extension	Hosted service, Browser extension
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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