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Foxmail vs Mailspring: catalog facts
Foxmail	Mailspring
Free Free to download.	Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…
Windows, macOS	Windows, macOS, Linux
Handles very large mailboxes Built-in notes synced with QQMail	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
Changelog gives little detail beyond bug fixes Note sync is tied to Tencent's QQMail	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 October 1, 2026	Official website Full listing and sources Checked September 21, 2026

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