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Yes, the app apk itself has to be side-loaded so you'd likely have to confirm downloads from unknown sources.

The logging of books is definitely made to be done by the parent with the kid at their side. Understandably, every family is going to have differing rules about screen time, and the animations upon logging are mostly my own preference for my own kids and for not gamifying it too much.

It would also be to counter-productive to have an app that's meant to lower time preference, that's also smashing dopamine reward centres in the brain too often, if that makes sense.

I tend to agree about the prominence of the fraud detection being unnecessary, and the discovery process being challenging. Those are excellent points, so thanks for sharing.

As for the 20$/year, some kids can reach the first milestone in 8-9 months, other will take 16-24, but the point is to lower time preference and learn to save. That would be the excess value the app is providing.

For me personally, for my kids to develop a low time preference is something I consider to be priceless, as it is the foundation for all advanced civilization and high culture.

ps: I just added another tool (free) parents can use with their kids to have fun and lower time preference. www.marshmallowreading.com/strength