> For the complete documentation index, see [llms.txt](https://guides.noloco.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guides.noloco.io/settings/login-and-signup.md).

# Login & Signup

- [Sign in Options](https://guides.noloco.io/settings/login-and-signup/sign-in-options.md): Control how your users sign in (or sign up) to your app from the User Lists & Sign-up settings
- [Single Sign On](https://guides.noloco.io/settings/login-and-signup/single-sign-on.md): Integrate your enterprise login service with Noloco
- [2FA - Two Factor Authentication](https://guides.noloco.io/settings/login-and-signup/2fa-two-factor-authentication.md): You can add an additional layer of protection and security to your Noloco App by enabling 2FA (Two Factor Authentication) in the Sign in Options
- [Client Portal User Add-On](https://guides.noloco.io/settings/login-and-signup/client-portal-user-add-on.md): Easily manage and control costs associated with external users accessing their app, such as clients, customers, partners, contractors, and freelancers.


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