Compare software

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

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