In-app browsers are bunk compared to full-featured browsing apps, but they’re also a major privacy and security risk. Many apps sneak data trackers onto websites you visit through their in-app browser using a method called Javascript injection, which adds extra code to a page as it loads. These trackers can scoop up browsing history, login data, and even keyboard presses and text entry.
While not always used for nefarious means, Javascript injection is a potential security threat that, until now, was difficult to check for inside in-app browsers. Luckily, security researcher Flix Krause’s new ap(p)tly named tool, InAppBrowser, checks if an app’s built-in browser uses potentially dangerous Javascript injections to track your data.
For it to detect anything though, you need to open this website from inside that app you want to test (by posting/mailing the link to yourself for that app).
See
This Tool Checks If In-App Browsers Are Tracking You#
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InAppBrowser 
You're risking your personal privacy whenever you open links in Instagram, TikTok, and other apps.
