# twofas/2fas-android

Source code for 2FAS Auth Android app

Repository: https://github.com/twofas/2fas-android
Canonical: https://ross.abutalabs.com/products/2fas-android
Language: Kotlin
License: GPL-3.0
License Family: copyleft
Last push: 2026-08-26T19:19:49+00:00

## Health v2 (maintenance only)
Score: 86/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 62, longevity 97
- inputs: {"age_days": 1360, "days_push": 7, "days_rel": 175, "gap_med": 85, "n_releases_24m": 8}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1497, forks 128 (observed 2026-08-28T04:04:53.921754+00:00)

## What it is
The official open-source Android app for 2FAS, a two-factor authentication service that generates one-time passwords (TOTP and HOTP) for securing online accounts. It works with any service supporting the TOTP/HOTP standard, such as Google, Microsoft, and Dropbox.

## Use cases
- generate TOTP codes for two-factor authentication on Android
- open source authenticator app alternative to Google Authenticator
- store 2FA tokens for multiple online accounts
- secure accounts with one-time passwords
- migrate authenticator tokens to a privacy-friendly app

## When to choose
- you want a free, open-source TOTP/HOTP authenticator on Android
- you need compatibility with any standard 2FA-enabled service
- you prefer an actively maintained app with public source code

## When to avoid
- you need an iOS authenticator (this is Android-only)
- you require push-based or FIDO2/WebAuthn authentication rather than OTP codes
- you need a cross-platform desktop authenticator

## Facets
- artifact type: application
- maturity: active
- function: auth, security, cryptography
- domain: security, privacy, android-tools, mobile-development
- platform: jvm
- tags: totp, hotp, two-factor-authentication, authenticator-app, otp, open-source, android, mobile

## Member repositories
- twofas/2fas-android (main) score 86

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:53.921754+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:33:10.790179+00:00, confidence not recorded.
  - readme: https://github.com/twofas/2fas-android (fetched 2026-08-28T04:04:53.921754+00:00, sha a78d8203690b)
- Data as of 2026-08-30T08:39:29.467469+00:00.