Android and iOS should both have some kind of kiosk mode, so in principle either should work.
The Android one seems to be Settings/Security/Screen Pinning, and the iOS one something like Settings/Accessibility/Guided Access. I just did a quick search for "android kiosk mode".
To be fair, I just tried this on Android and it's not totally foolproof - it tells you how to exit the pinned app, and following the instructions dumps you at the lock screen. So, if they do that, someone needs to unlock the tablet again and then the app is un-pinned.
There is specific kiosk software as well, which might work and may even be free, but I don't have any experience of it.
Useful information.
So setting up the gadget in Kiosk Mode (looked it up) would keep things simple and prevent the user making things complicated for themselves.
Thanks
Android and iOS should both have some kind of kiosk mode, so in principle either should work.
The Android one seems to be Settings/Security/Screen Pinning, and the iOS one something like Settings/Accessibility/Guided Access. I just did a quick search for "android kiosk mode".
To be fair, I just tried this on Android and it's not totally foolproof - it tells you how to exit the pinned app, and following the instructions dumps you at the lock screen. So, if they do that, someone needs to unlock the tablet again and then the app is un-pinned.
There is specific kiosk software as well, which might work and may even be free, but I don't have any experience of it.