I LOVE any “Everyday Math” apps! Tric Trac, Top It, etc. They are enabled for partner play and challenge kids to really use the math skills that we are teaching while using the taking turns skills that kids lack nowadays! Just search “Everyday Math” and you’ll see a wide array of choices for various levels.
There are a few good ones out there. Here’s a little list of ones I’ve found and have good reviews:
Baby plants vegetables
Beginning sounds interactive games
Clever bird early science
Weird but true (National Geographic)
Kids song collection
ABC for kids
Discover musical instruments
Story starter ideas for writing
A life cycle app
Running records calculator
Hope these help! You can also search the App store for ‘Education apps’ or a specific learning area, and read reviews to check it’s educational value. Good luck!