Compare software

fx vs Aider: catalog facts
fx	Aider
Free Free and open source under Apache-2.0.	Free Aider itself is free and open source under Apache 2.0. You pay whatever your chosen model…
Command line	Windows, macOS, Linux, Command line
Supports interactive sessions and one-off requests Works with local and cloud inference providers	Commits every change to git automatically, so the usual diff and revert tools work Maps the whole codebase, which is what makes it usable on projects of real size
Marked experimental, with frequent changes expected	Needs an API key and per-token spend unless you run a local model Terminal-driven; there is no graphical interface
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: Apache-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 21, 2026

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