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Mailbutler vs Mailtrack: catalog facts
Mailbutler	Mailtrack
Paid Subscription service with a 14-day free trial.	Freemium A free tier adds a signature to tracked mail. Paid plans remove it and add features.
macOS, Browser extension	Browser extension
Works inside Apple Mail and Gmail Mail merge with scheduled sending	Simple, visible read receipts directly inside Gmail
Email tracking reveals recipient activity, which some recipients object to Requires a subscription after the trial	Tracking recipients without telling them is intrusive and often blocked Free use adds a signature line to your emails, and it requires Gmail access
Downloadable app, Browser extension	Browser extension
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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