> For the complete documentation index, see [llms.txt](https://docs.cotter.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cotter.app/sdk-reference/api-for-other-mobile-apps.md).

# API for Other Mobile Apps or CLI

For cli apps and other mobile apps languages and frameworks that are not yet supported, you can use our API. Here are the guides on how to use them.

## Complete Guides

#### Sign in with Email/Phone Number

Authenticate users by sending a Magic Link or OTP via email, SMS, or WhatsApp.

{% content-ref url="/pages/-M0QVaCMLRWd0jUsIcYn" %}
[Verify Email/Phone Number](/sdk-reference/api-for-other-mobile-apps/api-for-mobile-apps.md)
{% endcontent-ref %}