App SDK’s Widget turns white after entering fullscreen in ChatGPT mobile app (works fine in browser)

ChatGPT Apps SDK
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Hi everyone,

I’m running into a fullscreen-related issue with a ChatGPT App widget and wanted to check if others have seen something similar.

What works:

  • When opening the widget in a desktop or mobile browser, fullscreen works as expected.

  • The widget renders correctly before entering fullscreen in all environments.

The problem:

  • When the same widget is opened inside the ChatGPT mobile app (iOS/Android),

  • Tapping fullscreen causes the entire widget area to turn white,

  • After that, the widget becomes unusable (no UI, no interactions).

Notes / context:

  • This only happens in the ChatGPT mobile app, not in browsers.

  • There are no obvious runtime errors visible from the widget side.

  • It feels like something related to viewport resizing, iframe lifecycle, or fullscreen handling in the app container.

Questions:

  1. Is this a known limitation or bug of the ChatGPT mobile app’s widget container?

  2. Are there any best practices or constraints around fullscreen support on mobile?

  3. Is there a recommended way to detect or handle fullscreen differently in the ChatGPT app vs browser?

Any insight, confirmation, or workaround would be greatly appreciated :folded_hands:
Thanks in advance!

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Hi!

I’m running into the same issue with rendering the fullscreen view inside the ChatGPT app on IOS only tho. The initial search carousel displays fine, but when clicking a product, the fullscreen view appears blank, and closing it causes the carousel to disappear.

Everything works as expected on Android and Web.

Are you still facing the same issue?

Thanks! :slight_smile:

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Do any of y’all happen to have a minimal example I can pass along? I haven’t been able to replicate this myself.