I have Allstays Camp and RV on both my Android phone and and tablet and it still works OK. It isn't available for purchase for Android anymore.
I found the following info on the Allstays website:
Android
Multiple things happened (map fee increase, a app ban/removal and censor of core data) that led to a departure from Android in late 2017. Full data is still on Apple and allstays.com as normal. The Android apps will keep running and anything that goes to the web (website links, images, reviews, etc) will still work and be updated. But major code updates, data adds and deletions will not happen. You can still reinstall on devices as below.
Versions may vary a little but general steps for reinstalling on Android any time for past customers:
On your Android phone or tablet, open the Google Play Store app Google Play.
Make sure you are logged with the account used before to buy
Tap Menu Menu and then My Apps & games and then Library.
Tap the app you want to install or turn on.
Tap Install or Enable.