> For the complete documentation index, see [llms.txt](https://dev.isdown.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.isdown.app/introduction.md).

# Introduction

IsDown is a status page aggregator & outage monitoring tool for all your business-critical dependencies. Get a health dashboard with all your external services. Instant notifications on outages. All in one place.

To get started with developing against the [IsDown](https://isdown.app) API, you first need an IsDown account. You can [Sign In](https://isdown.app/users/sign_in) or [Create your new account here](https://isdown.app/users/sign_up).