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Yesware vs Mailbutler: catalog facts
Yesware	Mailbutler
Paid Paid plans with a 14-day free trial and no credit card required.	Paid Subscription service with a 14-day free trial.
Windows, macOS, Web, Browser extension	macOS, Browser extension
Works inside both Gmail and Outlook Real-time open, click and download alerts	Works inside Apple Mail and Gmail Mail merge with scheduled sending
Paid after the trial Focused on sales teams rather than personal email	Email tracking reveals recipient activity, which some recipients object to Requires a subscription after the trial
Hosted service, Browser extension	Downloadable app, Browser extension
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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