# Understanding data absence

96% of US IOS users opt-out of tracking...

And millions use cookie blockers, ad blockers\
\
When they do, the Pixel is literally helpless

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**Pixel limitation:** Pixel is a bit vulnerable because it’s easily shut down entirely by anything in the browsers that **don’t allow third-party Javascript to load.**
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Then, Conversion API came in to save the day

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**CAPI to the rescue:** CAPI will be fully active no matter the weather, sending data from a server to Facebook’s server. So it’s strong, cool, calm, and collected.
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But there is always a **trade-off.** CAPI is very tech-demanding, while there are tons of one-click Pixel installations for you to choose from.

If you’re a bit technical then here goes the bonus flow:

<figure><img src="https://2018944329-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F6nRvcVoGY4QrsHN9eWVJ%2Fuploads%2Fpsq5CsjuXMXyQyPxwMYw%2Ffacebook-api-vs-pixel-diagram-862x569.png?alt=media&#x26;token=140a257b-917b-42c2-8bd6-d23cf0c71e5f" alt=""><figcaption></figcaption></figure>

**TL;DR?** CAPI ensures no data loss, *Facebook is happy because it gets the full picture of what’s happening.* Think of it as the big brother protecting its little brother - Pixel.

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📝How to know if a Conversion API tool is good or bad? Check out this blog [Facebook Conversion API simplest explanation & how to look for good server-side solution](https://www.omegatheme.com/blog/456-facebook-conversion-api-simplest-explanation-how-to-look-for-good-server-side-solution)&#x20;
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{% content-ref url="../../getting-started/level-up-your-data-with-capi" %}
[level-up-your-data-with-capi](https://docs.twoowls.io/getting-started/level-up-your-data-with-capi)
{% endcontent-ref %}