As announced back in April, the standalone Acepedia mobile app is no longer supported. It has been removed from both the Google Play Store and the iOS App Store.
iOS: The Acepedia mobile app will stop working in iOS 13+.
Android: The Acepedia mobile app may continue to function, but newer Android versions and the new Fandom platform will eventually break the app.
The reasons for this are multifaceted. Apple does not allow Fandom to maintain so many mobile apps for each wiki, and the resources required to update all of the mobile apps are no longer viable with new data privacy laws and the new Fandom platform being built as we speak.
Instead, Fandom has an updated and improved "unified mobile app". You can browse Acepedia as well as most other popular Fandom wikis all from the same mobile app! Uninstall the Acepedia mobile app (as well as any other individual wiki mobile apps you may have from Fandom) and download the new Fandom mobile app at the following links: