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Mailspring vs Foxmail: catalog facts
Mailspring	Foxmail
Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…	Free Free to download.
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	Handles very large mailboxes Built-in notes synced with QQMail
Read receipts and link tracking are paid, and are tracking features Electron, so still heavier than a native client	Changelog gives little detail beyond bug fixes Note sync is tied to Tencent's QQMail
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 October 1, 2026

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