# Single sign-on (SSO)

> Single sign-on (SSO) is a login method in which users sign in once to a central identity provider and can then use several applications without further passwords. Common standards are SAML and OpenID Connect.

- URL: https://saascolumn.com/en/glossary/single-sign-on-sso/
- Published: 13 November 2026
- Other languages: DE https://saascolumn.com/glossar/single-sign-on-sso/

With SSO, an identity provider such as Microsoft Entra ID, Google Workspace or an in-house LDAP directory checks the login. The individual applications trust this provider and do without their own passwords.

**The biggest benefit for small businesses is central control.** When someone leaves, you disable one account and access to all connected tools ends. Multi-factor authentication can also be enforced centrally.

Many SaaS vendors offer SAML SSO only on higher plans. According to its pricing page, Slack includes it from Business+, Mattermost from Professional. Factor this upgrade into your cost planning. Our [team chat comparison](https://saascolumn.com/en/compare/team-chat-tools-comparison/) gives an overview.

SSO does not replace strong credentials at the identity provider itself. Always protect this central account with a second factor, such as an authenticator app or a security key.

## Sources

1. [Slack pricing](https://slack.com/pricing), Slack
2. [Editions and Offerings](https://docs.mattermost.com/product-overview/editions-and-offerings.html), Mattermost