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Mailbird vs Mailspring: catalog facts
Mailbird	Mailspring
Paid Paid desktop app, sold as a one-time or subscription license.	Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…
Windows, macOS	Windows, macOS, Linux
Unifies multiple email accounts and providers into one inbox App integrations reduce the need to switch to separate tools	Unified inbox, snooze, send later, rules and templates in the free tier C++ sync engine keeps memory and battery use down for an Electron app
Windows and macOS only Full feature set requires a paid license	Read receipts and link tracking are paid, and are tracking features Electron, so still heavier than a native client
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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