The iOS App for Sentinels of Multiverse is down to 99ct right now. The normal price should be 6.99. The InApp purchases still cost the same as far as I can tell. The steam- and google play store version are not on sale.
The app is universal (I didn't know that... was tablet only in the past).
Definitely check the game out for this price. Sentinels is one of the best board game apps that are out there from my perspective. Even without the expansions the base game alone gives plenty of replayability
[Update] The app is on sale now for Android as well. On top of that, the InAppPurchase for season 1 is discounted by 20%. [/Update]