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

# Constraints and Limits

> Constraints and Limits — CometChat documentation.

This page outlines the system constraints and limitations for CometChat's Moderation Service. Understanding these limits helps you design your moderation strategy effectively.

<Note>
  **Need higher limits?** Contact [CometChat Support](https://www.cometchat.com/contact) to discuss enterprise options for increased limits.
</Note>

<Info>
  For detailed API parameter constraints (Rules, Lists, Advanced Settings), see the [Properties and Constraints](/rest-api/moderation-apis/properties-and-constraints).
</Info>

***

## Supported Formats

| Media Type | Supported Formats |
| ---------- | ----------------- |
| **Images** | JPEG, PNG         |
| **Videos** | MP4, MOV, AVI     |

<Warning>
  Other image and video formats are not currently supported for AI moderation.
</Warning>

***

## Known Limitations

<AccordionGroup>
  <Accordion title="SDK Version Requirement">
    Moderation features require SDK version **3.0 or higher**. Ensure your app is updated before enabling moderation.
  </Accordion>

  <Accordion title="Message Delivery Status Behavior">
    If a message is marked as delivered/read and previous messages include pending or disapproved ones, those will also be automatically marked as delivered/read—even though they weren't actually delivered to the receiver.
  </Accordion>
</AccordionGroup>

***

## Quick Reference

| Limit                            | Value |
| -------------------------------- | ----- |
| **Maximum custom rules per app** | 25    |
| **Maximum custom lists per app** | 25    |
| **Maximum filters per rule**     | 10    |
| **Maximum conditions per rule**  | 10    |

***

## Related Resources

<CardGroup cols={2}>
  <Card title="Rules Management" icon="shield-check" href="/moderation/rules-management">
    Configure moderation rules
  </Card>

  <Card title="Lists Management" icon="list" href="/moderation/lists-management">
    Manage keyword lists
  </Card>

  <Card title="Moderation Overview" icon="eye" href="/moderation/overview">
    Learn about the moderation system
  </Card>

  <Card title="Contact Support" icon="headset" href="https://www.cometchat.com/contact">
    Request higher limits
  </Card>
</CardGroup>