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