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LFortran is a modern open-source (BSD licensed) interactive Fortran compiler built on top of LLVM. It can execute user's code interactively to allow exploratory work (much like Python, MATLAB or Julia) as well as compile to binaries with the goal to run user's code on modern architectures such as multi-core CPUs and GPUs.


Try online:


All documentation, installation instructions, motivation, design, ... is available at:

Which is generated using the files in the doc directory.


We welcome all contributions. The main development repository is at GitHub:

Please send Pull Requests (PRs) and open issues there.

See the CONTRIBUTING document for more information.

Main mailinglist:

You can also chat with us on Zulip (project chat).

Note: We moved to the above GitHub repository from GitLab on July 18, 2022.


You can support LFortran's development by donating to NumFOCUS or Open Collective as well as GitHub Sponsors:

All donations will be used strictly to fund LFortran development, by supporting tasks such as paying developers to implement features, sprints, improved documentation, fixing bugs, etc.

The donations to LFortran are managed by the NumFOCUS foundation. NumFOCUS is a 501(c)3 non-profit foundation, so if you are subject to US Tax law, your contributions will be tax-deductible.

If you want to discuss another way to fund or help with the development, feel free to contact Ondřej Čertík (

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