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Pi vs fx: catalog facts
Pi	fx
Free The MIT-licensed software is free; hosted model providers may require a subscription or…	Free Free and open source under Apache-2.0.
Windows, macOS, Linux, Command line	Command line
Reads and edits project files and runs shell commands from a terminal interface Supports multiple model providers, including local models	Supports interactive sessions and one-off requests Works with local and cloud inference providers
Does not include a built-in permission system for restricting filesystem, process, network, or credential access	Marked experimental, with frequent changes expected
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: Apache-2.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 6, 2026	Official website Full listing and sources Checked October 8, 2026

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