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iTerm2 vs Tabby: catalog facts
iTerm2	Tabby
Free Free and open source under the GPL.	Free Free and open source under the MIT licence.
macOS	Windows, macOS, Linux
Instant replay and shell integration make past output easy to recover Native tmux control mode turns tmux windows into real tabs	Local shells, SSH, Telnet and serial connections in one program Encrypted container for SSH secrets and configuration
macOS only So many settings that first-time configuration is daunting	Electron, so start-up and memory use are well above a native terminal The plugin ecosystem is small
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: MIT
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 September 22, 2026	Official website Full listing and sources Checked September 21, 2026

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