Fn Project is an open-source container-native serverless platform that can run on any cloud or on-premise.

Yes. Fn is open source under the Apache-2.0 licence. Its source code is on GitHub at fnproject/fn and is written mainly in Go.

Yes. Fn is open source, so the software itself is free to use.

Yes. Fn can be self-hosted on your own server or infrastructure.

What is Fn an alternative to?

Fn is an open-source alternative to Modal, AWS Lambda, Azure Functions and Google Cloud Functions. Other open-source alternatives to Modal include Fission, OpenFaaS and Nuclio.

Is Fn actively maintained?

Yes. The most recent commit to Fn was on 24 September 2026, and the latest release is 0.3.25, published on 26 July 2017. The project has 5.9k stars on GitHub.

Fn: open-source alternative to Modal, AWS Lambda

About Fn

Fn Project is an open-source container-native serverless platform. It can run on any cloud or on-premise infrastructure.

The platform is designed to be easy to use, supports every programming language, and is extensible and performant.

Key features

Container-native architecture
Runs on any cloud or on-premise
Supports every programming language
Extensible and performant

Built with: Go tools; Docker tools; Kubernetes tools
Tags: serverless; container-native; open-source; cloud-agnostic; on-premise

Fn: questions and answers

What is Fn?: Fn Project is an open-source container-native serverless platform that can run on any cloud or on-premise.
Is Fn open source?: Yes. Fn is open source under the Apache-2.0 licence. Its source code is on GitHub at fnproject/fn and is written mainly in Go.
Is Fn free?: Yes. Fn is open source, so the software itself is free to use.
Can I self-host Fn?: Yes. Fn can be self-hosted on your own server or infrastructure.
What is Fn an alternative to?: Fn is an open-source alternative to Modal, AWS Lambda, Azure Functions and Google Cloud Functions. Other open-source alternatives to Modal include Fission, OpenFaaS and Nuclio.
Is Fn actively maintained?: Yes. The most recent commit to Fn was on 24 September 2026, and the latest release is 0.3.25, published on 26 July 2017. The project has 5.9k stars on GitHub.