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Mailspring vs Kiwi for Gmail: catalog facts
Mailspring	Kiwi for Gmail
Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…	Paid Paid after a free trial, and can be cancelled at any time.
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	Gmail and Google Workspace in dedicated desktop windows Quick access to Docs, Sheets, Slides and Drive
Read receipts and link tracking are paid, and are tracking features Electron, so still heavier than a native client	Only works with Gmail and Google Workspace Paid after the trial
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	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 23, 2026

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