The Star Realms app is far more well-supported though, with all major expansions and all but the last 2 mini expansions available, while the Hero Realms app is just the base set with no apparent plans to support it further.
Ascension is my most played by far. It's one of the earliest deckbuilders and the first one (I think) with the river-style market which has been used in many other deckbuilders since. The developers have done a great job exploring various mechanisms in the expansions over the years and most of the content is available in the digital version too. My favorite sets are the ones that use Insight (the amber gems): Dreamscape, Delirium, Deliverance.
Besides the game mechanics the great art, music and the smooth app make it very chill and enjoyable for me.
The ODD app is great, makes it easy to experiment with the dice combos. Practicing with it made the physical game more enjoyable too. The app also helped me discover two-handed solo which is a great way to play the game.
There used to be a pretty minimalist app as well, I think by Fans, that was even better imo.
No idea if that still exists, but the CPU knew how to throw hands and the online worked well enough
I really like Deep Space D6 for Android (it might be on IOS too). It's a quick and easy game, that I like playing on the phone when there's nothing else to do. The game is very basic without cool graphics, but that's what I like about it.
Though choice! I choose Sagrada just because of how much I like the real game and how well made is the digital version, but Ascension, Mystic Vale, and Through the Ages are close.
I just went on a rollercoaster... Never knew there was an app for Coffee Roaster.
Went to download it on android. "This app isn't available for your device because it was made for an older version of Android" :(
I really enjoyed the Galaxy Trucker app! There was no reason for them to add so much extra content to that game, but they did and it's awesome. I should play a round or two again, it's been a while.
For me it would be Root all the way - especially with the expansions. It's a brilliant adaptation! There's a group of us who always have at least one game on the go it's turned into a bit of an addiction...
Honourable mentions for Yellow & Yangtze and Concordia as well. Also solid apps for great games