Is Flask free and open source?

Yes. Flask is free and open source, released under the BSD-3-Clause license. You can view and contribute to the source at https://github.com/pallets/flask.

What language is Flask written in?

Flask is primarily written in Python.

What are open-source alternatives to Flask?

Other open-source web & apis tools on OSSDrop include React, Flutter, Next.js, Supabase.

Flask

Curated

Python micro web framework for building web applications and APIs.

Visit flask.palletsprojects.com Source

Web & APIs·BSD-3-Clause·Python·72.1k stars·3.1.3·added 2026-08-12

Curated listing — added by OSSDrop, not the maker.

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Frequently asked

What is Flask?
Flask is an open-source web & apis tool — Python micro web framework for building web applications and APIs. It is written in Python.
Is Flask free and open source?
Yes. Flask is free and open source, released under the BSD-3-Clause license. You can view and contribute to the source at https://github.com/pallets/flask.
What language is Flask written in?
Flask is primarily written in Python.
What are open-source alternatives to Flask?
Other open-source web & apis tools on OSSDrop include React, Flutter, Next.js, Supabase.

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