About · Updated
About FoldCheck
FoldCheck is an independent tracker of which apps are ready for iPhone Duo, built from public App Store data and owner reports. Not affiliated with Apple.
Why this exists
When iPhone Duo reviews went live on October 21, 2026, the most common complaint was apps that don't fill the inner display yet. Owners kept asking the same question: does the app I use work?
FoldCheck answers it app by app, in English and Chinese, for both the US and China App Stores.
Independence
FoldCheck is an independent project. It is not affiliated with, endorsed by or sponsored by Apple Inc. or any app developer. iPhone and App Store are trademarks of Apple Inc.
Verdicts are never paid for. Developers can't buy a better status; the only way to change it is to ship an update or to have owners report it.
Corrections
If a verdict is wrong, the fastest fix is a report from the app page. Three matching reports for the current version replace the automatic verdict.