> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.readable.com/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# What is the Automated Readability Index (ARI)?

The ARI assesses the U.S. grade level required to read a piece of text. We use the ARI formula along with several others in our bespoke algorithms to give you a unique overall readability rating. 

You can read more about ARI and its origin [here](https://readable.io/blog/how-did-the-automated-readability-index-become-an-essential-tool-for-technical-writers/).