About SingleSign
SingleSign is a free identity provider that implements OAuth 2.0 and OpenID Connect, operated by Kraferd.
In short
SingleSign is a free identity provider that implements OAuth 2.0 and OpenID Connect. Developers use it to add sign-in to web, mobile and single-page applications using the Authorization Code flow with PKCE; account holders use it to see exactly which applications can reach their data, approve each scope individually, and revoke any application instantly. SingleSign is operated by Kraferd and also runs SingleSign Mail, a consent-first email service.
The facts, stated plainly
- SingleSign is a
- identity provider
- SingleSign implements
- OAuth 2.0
- SingleSign implements
- OpenID Connect
- SingleSign supports
- Authorization Code flow with PKCE
- SingleSign supports
- multi-factor authentication
- SingleSign costs
- nothing to use
- SingleSign gives account holders
- per-app consent and instant revocation
- SingleSign does not
- sell or share account holder data for advertising
- SingleSign operates
- SingleSign Mail, an email service at email.singlesign.com
- SingleSign is operated by
- Kraferd
What SingleSign runs
SingleSign
OAuth 2.0 / OpenID Connect identity provider.
singlesign.comSingleSign Mail
Consent-first email with a Screener for first-time senders.
email.singlesign.com
Who operates SingleSign
SingleSign is operated by Kraferd. The service has been available since 2026. Questions about the company, the products or this page belong in the help centre; the terms that govern use of the service are in the terms of service.
Get SingleSign in your Google resultsAdd as a preferred source
Read next
- SingleSign pricingSingleSign pricing in one line: sign-in is free, with no monthly-active-user meter. See exactly what is included, and what SingleSign Mail costs for businesses.
- Firebase Auth comparisonSingleSign vs Firebase Authentication on lock-in, portability and consent, plus the cases where staying on Firebase is right.
- Google Sign-In alternativeSingleSign vs Google Sign-In: the same one-tap convenience, without an advertising business behind the identity.
- alternative to Auth0Auth0 alternatives compared, plus the part most listicles skip: what migrating off Auth0 actually involves, which code changes, and which does not.
- Identity provider alternativesIdentity provider alternatives, by the provider you are leaving: what actually has to change in your code, and what does not.
- Auth0 comparisonSingleSign vs Auth0 compared on the difference that matters: who owns the account. A side-by-side table, then the three cases where each one is the right call.
- SingleSign vs OktaSingleSign vs Okta: Okta is built for workforce identity inside a company, SingleSign for consumer sign-in across applications.
- alternative to OktaOkta alternatives for teams that need customer sign-in rather than workforce identity. The table first, then what changes when you move consumer auth off Okta.