# Stunt Double Index (/index-ranking)

# Stunt Double Index [#stunt-double-index]

More of your visitors arrive through an AI agent: someone asks ChatGPT, Claude,
Gemini or Perplexity to compare products, find an answer or check out on their
behalf. The [Stunt Double Index](https://index.stuntdouble.io) measures how that
goes on your site, and ranks it against everyone else.

Each tracked domain gets a score out of 100, a band and a rank, overall and
within its sector. Index data is public, so you can read any tracked site's
report, including your competitors'.

## How a site is scored [#how-a-site-is-scored]

A score comes from two kinds of evidence:

- **Probes.** HTTP checks that look at what agents depend on, such as whether
  pages are server-rendered, structured data is present and agents are allowed
  in. Each failing check is listed with its weight.
- **Agent sessions.** Live sessions, one per AI provider and benchmark task,
  where an agent tries a real job on the site. Each session records what the
  agent tried, its rubric evidence, a summary and the frictions it hit.

A full run is the probes plus about 24 agent sessions. Stunt Double runs the
sessions on the same [browser toolset](/stuntkit/browser-toolset) its actors
use.

## What it measures [#what-it-measures]

| Category              | Can an agent...                                    |
| --------------------- | -------------------------------------------------- |
| Brand awareness       | Recognize the brand and what it offers             |
| Discovery             | Find the site and the right page for a task        |
| Information retrieval | Read the facts it needs from the site              |
| Market ranking        | Place the site among its competitors               |
| Accuracy              | Report what the site says without getting it wrong |
| Checkout              | Get through to buying, on a person's behalf        |
| Delegated access      | Act for a signed-in person                         |
| Support               | Find help content and get an answer                |

The report also breaks the score down by provider, so you can see when one
agent struggles where the others don't.

<Callout variant="note" title="No score?">
  A site can be tracked without a score when the checks were blocked or
  unanswered, or the site opted out. The report says which.
</Callout>

## Add or claim a site [#add-or-claim-a-site]

Anyone signed in can add a site that isn't tracked yet at
[index.stuntdouble.io](https://index.stuntdouble.io). A new site gets light
probes by default, with an option to add live agent sessions.

Claim your domain to re-score it after you ship changes.

## Next steps [#next-steps]

- **[Check and improve a site's score](/index-ranking/improve-your-score)**
- **[Browse the leaderboard](https://index.stuntdouble.io)**
- **[Make any site readable by AI agents](/stuntkit/wao)**