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Extraterm vs kitty: catalog facts
Extraterm	kitty
Free Free and open source under the MIT license.	Free Free and open source under the GPL.
Windows, macOS, Linux	macOS, Linux
Frames each command's output with shell integration Built-in SSH client and images in the terminal	Inline image display through its own graphics protocol Kittens add diffing, hints, remote control and SSH integration
Output framing needs shell integration for bash, zsh or fish Still at a pre-1.0 version	No Windows build Configuration is a text file with no graphical settings
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0
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 24, 2026	Official website Full listing and sources Checked September 22, 2026

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