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Mailplane vs Meru: catalog facts
Mailplane	Meru
Paid Paid license; the current version 4 download is for existing license holders.	Freemium Free to use, with a paid Pro upgrade and a 14-day Pro trial.
macOS	Windows, macOS, Linux
Handles many Gmail accounts in one window Menu bar notifier with quick archive and reply	Multiple Gmail accounts visible at once Native desktop notifications
Mac only and limited to Google accounts New version 5 not yet released; version 4 is for existing license holders	Works only with Gmail Some features require the paid Pro tier
Downloadable app	Downloadable app
Closed source	Open 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 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.