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

# Using simulation mode

> Preview and test feature experiment configurations in a controlled environment before deploying them to production.

Simulation mode enables you to preview and test experiments in a controlled environment before you deploy them to production.

<Note>
  For Feature Experimentation, the simulation panel is primarily used for testing and debugging. It does not offer the full functionality available in Web Experimentation. For more details, see [What the simulation panel does](#what-the-simulation-panel-does).
</Note>

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  ![](https://storage.googleapis.com/kameleoon-storage-documentation/user-manual/images/experimentation/feature-experimentation/using-the-rollout-planner/using-simulation-mode/simulation-panel.png)
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## Prerequisites

If you implement Kameleoon Web Experimentation or use Feature Experimentation in [Hybrid mode](../../../../../developer-docs/feature-experimentation/get-started/hybrid-experimentation), simulation mode works automatically on all major web browsers. No additional setup is required.

If you *only* use Feature Experimentation, you must manually inject the Kameleoon tag to test your configuration. To inject the tag, use the Kameleoon Chrome extension.

<Note>
  Simulation mode only supports web SDKs. It does not support mobile SDKs.
</Note>

To manually inject the Kameleoon tag:

1. Install the [Kameleoon Chrome Extension](https://chromewebstore.google.com/detail/kameleoon/nimncjjomfcjmfnghgaopccmdggjfoam).
2. Open the extension in your browser console and follow the on-screen instructions to log in.
3. Open the **DevTools** panel and click **Tag Injection**.
4. Enter your **Sitecode**, select your **Environment**, and select the **Add Anti-Flicker** checkbox.
5. Apply the changes and refresh the page.
6. In **DevTools**, open the **Network** tab and verify the `kameleoon.js?injected=true` request appears. This request confirms successful tag injection.

## Access the simulation panel

After you confirm the tag injection, click the **three dots** menu for a rule, then click **Simulate**.

<Note>
  To ensure the SDK recognizes the flag configuration, verify the flag toggle is **ON** and the rule is **Active**.
</Note>

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  ![](https://storage.googleapis.com/kameleoon-storage-documentation/user-manual/images/experimentation/feature-experimentation/using-the-rollout-planner/using-simulation-mode/2.png)
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Alternatively, open the **three dots** menu in the top right of the editor, click **Simulate**, and select a rule from any environment to launch.

The simulation panel appears in the bottom half of the page.

## What the simulation panel does

* **Displays variants:** The simulation panel enables you to select and preview a variant in your browser for testing.
  * To test a variant in production without exposing it to users, set the allocated traffic for the variant to 0%.
* **Overrides targeting behavior:** The simulation panel ignores targeting rules. Targeting is managed at the SDK level, but the simulation panel overrides these rules to force the display of the selected variant.