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Aider vs fx: catalog facts
Aider	fx
Free Aider itself is free and open source under Apache 2.0. You pay whatever your chosen model…	Free Free and open source under Apache-2.0.
Windows, macOS, Linux, Command line	Command line
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	Supports interactive sessions and one-off requests Works with local and cloud inference providers
Needs an API key and per-token spend unless you run a local model Terminal-driven; there is no graphical interface	Marked experimental, with frequent changes expected
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: Apache-2.0
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 8, 2026

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