2Factorauth

2FA Directory is a crowdsourced resource maintained by the nonprofit organization 2factorauth. It helps people find websites that support two-factor authentication, a security measure requiring an additional verification step beyond a password. The directory organizes listings by categories and identifies the types of second factors each site supports, including SMS, email, phone calls, hardware devices, and software-based methods. This information can help users compare security options and choose services that offer verification methods suited to their needs.

The site also provides an API, making its directory data available for use beyond the website, and invites contributions from people who can add or update information. Its supporting sections include information about the project, privacy, legal matters, and bots. Because the directory relies on community-submitted data, its entries may be outdated; users should verify current authentication options directly with the relevant service. Hosted on GitHub, 2FA Directory serves as a practical reference for exploring two-factor authentication support across a range of websites.