We believe in the power of open source

Transparency is the only way to earn the trust of our community 

All Proton apps are open source and have been independently audited and verified by third-party experts. Anyone can see and verify that our apps do what we claim.

Proton apps are open source so anyone can inspect the code for security.

Open source enhances the security of our products

Proton's software has been independently audited for security by thousands of experts around the world. You can view the audit reports, inspect the code yourself, or even contribute improvements.

Choose the app you wish to explore


Our contributions to the open-source community

We are the primary maintainers of widely used open-source cryptographic libraries for the JavaScript and Go programming languages.



Making our code freely accessible to developers encourages innovation in privacy tech and helps solve real-world privacy challenges.

There are many ways to support Proton open source efforts.

Help Proton build an internet where privacy is the default

You can directly contribute to Proton by committing code improvements to our repositories or participating in our bug bounty program.

Contribute on GitHub

Bug Bounty Program

Proton Community

Community contributions have always been important to Proton’s growth. You can join the conversation with Proton on social media, become a beta tester, join the Proton localization project, and give us feedback that helps us develop our services.