> For the complete documentation index, see [llms.txt](https://server-side.docs.sirdata.net/sirdata-server-side/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://server-side.docs.sirdata.net/sirdata-server-side/english-1/f.a.q-server-side/facebook-capi/facebook-conversion-api-vs.-facebook-pixel.md).

# Facebook Conversion API vs. Facebook Pixel

### **Facebook Pixel**

* **Definition**: A script that tracks user activity on a website via the browser.
* **How It Works**: Client-side tracking via cookies.
* **Limitations**: Blocked by ad blockers and third-party cookie restrictions.

### **Facebook Conversion API (CAPI)**

* **Definition**: Server-side tracking for more accurate data.
* **Advantages**: Resistant to ad blockers and allows the use of first-party cookies.

### **Key Differences**

* **Client-side vs. server-side tracking.**
* **Data control**: CAPI offers more control.
* **Resilience to blockers**: CAPI is more robust.

### **Conclusion**

Using both solutions for comprehensive tracking is recommended.

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