# PowerBI Visual Architecture and Data Security

Astra is a Power BI visual plugin that runs **100% locally** in your Power BI environment. It does **not transmit, upload, or sync data** to any external servers. This design allows Astra to be safely deployed in sensitive or air-gapped environments.

## How Astra Works

* **Runs inside Power BI**: Astra executes entirely within Power BI’s built-in sandbox for custom visuals. No separate application or service is involved.
* **Receives data from Power BI only**: It visualizes data passed to it from the Power BI semantic model—nothing else.
* **In-memory rendering**: All data transformations and graph rendering happen in memory and are never written to disk or sent over the network.

## Network Communication

Astra makes **no network calls**. This includes:

| Activity                    | Status                                 |
| --------------------------- | -------------------------------------- |
| API requests (`fetch`, XHR) | ❌ Not used                             |
| WebSocket connections       | ❌ Not used                             |
| Telemetry or analytics      | ❌ Not used                             |
| CDN-hosted scripts          | ❌ Not used (all libraries are bundled) |
| File or disk storage        | ❌ Not used                             |

## Architecture Diagram

The diagram below illustrates Astra’s local execution model within the Power BI environment.

<figure><img src="/files/ttMwtVdNayoAhTu74jEF" alt=""><figcaption></figcaption></figure>


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