Science Apps for iPads

I've scoured the internet, asked for recommendations from Teachers Pay Teachers educators as well as the science teachers on the National Science Teachers Association listserv & here is what I found:

Here are the apps that I tried out, along with my brief review (I teach science to students in grades PK- 4):

 Please let me know of any science apps you use with your kids - I will add them to the list! I would also love to have your reviews on any of the apps listed above. I plan on going through as many as I can but it may take a while & I really don't want to buy apps unless the reviews are great so I'll start with reviewing the free ones first. Bookmark this page or pin it, I will be updating it as I go through the apps.
Hope you can use this information!