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Janet vs Factor: catalog facts
Janet	Factor
Free Free and open source under the MIT licence.	Free Free and open source under the BSD 2-Clause licence.
Windows, macOS, Linux, Command line	Windows, macOS, Linux
Entire language under 1MB in one binary Threads, networking and an event loop built in	Compiled implementation with interactive development Extensive documentation and a full standard library
Smaller package ecosystem than mainstream scripting languages Lisp-style syntax takes adjustment for newcomers	Stack-based style takes time to learn Small community compared with mainstream languages
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: BSD-2-Clause
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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