> ## Documentation Index
> Fetch the complete documentation index at: https://docs.perfai.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# What Perfai scans

> Perfai scans REST apps, websites, GraphQL apps and hybrids of them. Learn what one unit means for each, how the number on your app page is counted, and how the app type is decided.

## Application types

Perfai scans four kinds of application. Each one is counted in its own unit, and the number on your app page uses that unit.

<CardGroup cols={2}>
  <Card title="REST" icon="code">
    Counted in **endpoints**. One endpoint is one method and path, such as `GET /orders/{id}`.
  </Card>

  <Card title="Website" icon="globe">
    Counted in **pages**. One page is one page template, however many URLs use it.
  </Card>

  <Card title="GraphQL" icon="diagram-project">
    Counted in **operations**. One operation is one root query or mutation in your schema.
  </Card>

  <Card title="Hybrid" icon="layer-group">
    An app with both endpoints and pages. It's reported as both, for example `8 endpoints · 2 pages`.
  </Card>
</CardGroup>

***

## What one unit means

### Endpoints

An endpoint is one HTTP method on one path. `GET /orders` and `POST /orders` are two endpoints. Path parameters are part of the path, so `GET /orders/{id}` is one endpoint however many orders exist.

### Pages

A page is a page template, not a visited URL. If your site serves `/books/1024` and `/books/1025`, both are the same template, `/books/{id}`, and count as one page. This keeps the count stable as your content grows.

### Operations

A GraphQL app usually sits behind a single HTTP endpoint, such as `POST /graphql`. Counting that endpoint would report every GraphQL app as one. Perfai counts the root operations in your schema instead, so an app with 30 queries and 12 mutations counts as 42 operations.

<Note>
  Operation names are case-sensitive. `connectorActivate` and `ConnectorActivate` are two operations, because GraphQL treats them as two.
</Note>

***

## What isn't counted

Two things are tested or listed but left out of the headline number.

**Targets Perfai adds for its own checks.** Some checks apply to a whole site, such as security headers, cookies and CORS. When the crawl found no page to run them against, Perfai adds the site root (`/`) as a target. It's tested, but it isn't counted, because it isn't something the crawl found in your app. For the same reason, the site root is never counted as a page: every web app is served there.

**GraphQL subscriptions.** Subscriptions are part of your schema, so they're listed with your other operations. They aren't counted, because a subscription runs over a long-lived connection that Perfai has no way to test yet. Every coverage percentage divides by the headline number, so counting a surface that can't be tested would lower your coverage for a reason you can't fix.

***

## How the app type is decided

You don't declare the app type. Perfai decides it from what it finds:

* **REST** is the default.
* **GraphQL** is set when Perfai detects a GraphQL endpoint or schema. Supplying your schema when you add the app is the most reliable way.
* **Website** is set from what the first map finds. When your app serves more server-rendered pages than backend calls, it's typed as a website. The type is never decided from the landing page alone.

The number on your app page follows what Perfai actually found, not the type label. A REST app that also serves pages shows both endpoints and pages.

### Changing the type

If the type is wrong, open the app, go to **Edit App**, and choose **REST**, **GraphQL** or **SSR** under **API Type**. **SSR** is the website type. Perfai keeps your choice and doesn't overwrite it on later scans.