Open Source Alternatives to Google Authenticator

An authentication application that generates one-time verification codes for sites and apps supporting 2-Step Verification. The tool allows users to sign in to their Google Account and other compatible services without requiring an internet connection or mobile service. It supports synchronization of verification codes across multiple devices via a Google Account, with encryption for codes both in transit and at rest. Users may also operate the app without a Google Account, storing codes locally on the device. The software includes features for manual code transfer via QR codes, a privacy screen requiring biometric or PIN verification, and the ability to manage multiple accounts from one mobile device. It is deployed as a mobile application for Android and iOS.

Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to Google Authenticator give you an option you fully own. You can self-host them, so your data stays on infrastructure you control. This page lists 1 open source alternative to Google Authenticator. The most popular is 2FAuth. It uses the AGPL-3.0 license and ships an official Docker image.