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Mailbutler vs Yesware: catalog facts
Mailbutler	Yesware
Paid Subscription service with a 14-day free trial.	Paid Paid plans with a 14-day free trial and no credit card required.
macOS, Browser extension	Windows, macOS, Web, Browser extension
Works inside Apple Mail and Gmail Mail merge with scheduled sending	Works inside both Gmail and Outlook Real-time open, click and download alerts
Email tracking reveals recipient activity, which some recipients object to Requires a subscription after the trial	Paid after the trial Focused on sales teams rather than personal email
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.