# 2factorauth/twofactorauth

List of sites with two factor auth support which includes SMS, email, phone calls, hardware, and software.

Repository: https://github.com/2factorauth/twofactorauth
Canonical: https://ross.abutalabs.com/products/twofactorauth
Homepage: https://2fa.directory
Language: JavaScript
License: NOASSERTION
License Family: other
Topics: twofactorauth, two-factor, security, authentication, ruby
Last push: 2026-08-25T11:38:05+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 8, longevity 100
- inputs: {"age_days": 4556, "days_push": 8, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3455, forks 1770 (observed 2026-08-28T04:08:05.493297+00:00)

## What it is
A community-maintained dataset and API listing websites and services that support two-factor authentication, covering SMS, email, hardware, and software methods. It powers the 2fa.directory website and helps users compare services based on their 2FA support.

## Use cases
- find out which websites support two-factor authentication
- check if a service offers 2FA before signing up
- get a list of sites supporting hardware token authentication
- query an API for 2FA support data for my app
- compare security features of alternative services
- research which sites support SMS vs app-based 2FA

## When to choose
- you need comprehensive, community-verified data on 2FA support across websites
- you want a free API for 2FA support information with attribution
- you're building a tool that helps users choose more secure services

## When to avoid
- you need to implement 2FA in your own application rather than look up which sites support it
- you need real-time or guaranteed-accurate security data without manual verification
- you want to scrape the repository directly instead of using the provided API

## Facets
- artifact type: dataset
- maturity: active
- function: auth, security, search-engine, api-documentation
- domain: security, privacy, developer-tools, self-hosted
- platform: cli, cross-platform
- tags: two-factor-authentication, 2fa, directory, open-data, community-driven, api, web-server

## Member repositories
- 2factorauth/twofactorauth (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:05.493297+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 2026-08-29T18:37:30.631887+00:00, confidence not recorded.
  - readme: https://github.com/2factorauth/twofactorauth (fetched 2026-08-28T04:08:05.493297+00:00, sha a0088442f31a)
  - homepage: https://2fa.directory (fetched 2026-08-29T09:31:22.442453+00:00, sha 73422f132957)
- Data as of 2026-08-30T08:39:29.467469+00:00.