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Kiwi for Gmail vs Mailspring: catalog facts
Kiwi for Gmail	Mailspring
Paid Paid after a free trial, and can be cancelled at any time.	Freemium The client is free and open source. Mailspring Pro is a monthly subscription that adds…
Windows, macOS	Windows, macOS, Linux
Gmail and Google Workspace in dedicated desktop windows Quick access to Docs, Sheets, Slides and Drive	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
Only works with Gmail and Google Workspace Paid after the trial	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
Account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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