> For the complete documentation index, see [llms.txt](https://docs.keyless.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.keyless.io/userguide/using-the-mobile-app/authenticate.md).

# Authentication

After you have linked an account, you can authenticate using the Keyless App. To authenticate, the service you linked will send a push notification to Keyless Authenticator on your smartphone.

Authentication is simple and fast, with a consistent user experience no matter which service you are authenticating to.

![Authentication on the Keyless mobile app.](/files/-MSNg6nL4-JXPeC1o4-c)

## **Congratulations, you're in!** :sunglasses: