Is the software stack secure?

Outline is open source software developed by Jigsaw, an Alphabet Inc subsidiary company.

You can check out and contribute to the Outline code on GitHub. Outline uses Shadowsocks, a secure open-source protocol that is trusted by millions of users to access the free and open web.

ShadowSocks was audited by X41 D-SEC GMBH. You can read their public report here.

In November 2017, Outline was audited by Radically Open Security, a non-profit cybersecurity firm in the Netherlands. You can read their public report here.