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Mailspring vs Balsa: catalog facts
Mailspring	Balsa
Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…	Free Free and open source under the GPL.
Windows, macOS, Linux	Linux
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	Lightweight native GTK interface Fits in with the GNOME desktop
Read receipts and link tracking are paid, and are tracking features Electron, so still heavier than a native client	Linux only Smaller feature set than full PIM suites
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0-or-later
No account needed	No account 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 24, 2026

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