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

# App Marketplace

> Browse integrated applications built by developers

The App Marketplace showcases integrated applications built by third-party developers. These Apps connect to the platform through Profy's OAuth and Events API, seamlessly combining external services with AI capabilities to extend your workflow.

## What Is an App

An App is an external application created by independent developers that, through Profy's open API, gains access to:

* **User Identity**: Obtains your authorization through OAuth, no separate registration needed
* **AI Capabilities**: Calls AI models provided by Profy for conversation and reasoning
* **Billing Capabilities**: Uses Profy's credits system for service billing

<Tip>
  The difference between an App and an Expert: an Expert is an AI conversation entity within the platform, used inside Profy's chat interface; an App is an external standalone application with its own interface and features, connected to Profy via API.
</Tip>

## Browsing & Discovery

The App Marketplace provides category browsing and search:

* All published applications grouped by type
* Keyword search support
* Each App card displays its name, icon, description, and developer info

## App Detail Page

Click an App card to enter the detail page for complete information:

<CardGroup cols={2}>
  <Card title="Feature Overview" icon="circle-info">
    The App's core capabilities and use cases
  </Card>

  <Card title="Billing Model" icon="receipt">
    Clear fee descriptions and pricing methods
  </Card>

  <Card title="Developer Info" icon="code">
    Developer name, contact info, and other works
  </Card>

  <Card title="Permissions" icon="shield-check">
    Data and permission scope the App requires
  </Card>
</CardGroup>

## Billing Models

Apps support two billing methods:

| Model                     | Description                                                                   | Use Case                                         |
| ------------------------- | ----------------------------------------------------------------------------- | ------------------------------------------------ |
| **Per AI Call (Metered)** | When the App calls AI models, credits are deducted based on Token consumption | AI conversation Apps                             |
| **Per Use**               | Credits are deducted per custom event trigger                                 | Tool Apps (e.g., translation, format conversion) |

<Note>
  Specific rates are shown in real time on each App's detail page.
</Note>

## Installation & Authorization

<Steps>
  <Step title="Choose an App">
    Find the App you need in the marketplace and visit the detail page to learn about its features and pricing.
  </Step>

  <Step title="Authorize Installation">
    Click the "Install" or "Authorize" button. The system will display the permissions the App requires — confirm to complete OAuth authorization.
  </Step>

  <Step title="Start Using">
    Once authorized, the App can use your Profy account identity and credits to provide services.
  </Step>
</Steps>

<Warning>
  Authorizing an App means allowing it to perform specific actions on your behalf. Please read the permission descriptions carefully and only authorize applications you trust.
</Warning>

## Managing Installed Apps

You can manage your Apps at any time in your personal settings:

* View all authorized Apps
* Check usage history and credits consumption for each App
* Revoke authorization (the App will no longer be able to use your account after revocation)

## Developer Perspective

If you're a developer looking to build your own App and list it on the marketplace:

<CardGroup cols={2}>
  <Card title="Platform Console" icon="terminal" href="/en/documentation/developer/platform">
    Manage your Apps, API Keys, and call logs
  </Card>

  <Card title="API Documentation" icon="book" href="/en/documentation/developer/api">
    Learn about the Events API and OAuth integration
  </Card>
</CardGroup>

## Related Pages

<CardGroup cols={2}>
  <Card title="Expert Marketplace" icon="user-astronaut" href="/en/documentation/marketplace/expert-marketplace">
    Discover and use AI Experts
  </Card>

  <Card title="Skill Marketplace" icon="puzzle-piece" href="/en/documentation/marketplace/skill-marketplace">
    Install skill packs to extend capabilities
  </Card>
</CardGroup>