Kazakhstan has an app (QazETA) for its electronic travel authorization, which is required for many passport holders who want to enter under the visa-free regime. (Perhaps it is not strictly required as one could apply for a visa instead.)

Somewhat confusingly, the iOS App Store description [0] of the app says that it is not a government app, while the rest of the internet and Kazakh government sites say that it is the official government app for the purpose of applying for the ETA.

[0]: https://apps.apple.com/app/id6748705452