Quick Math Jr. (iPhone / iPad) by Shiny Things is a basic math app for 3-7 year olds featuring counting, addition, subtraction, number sequence, count skip, writing numbers and more. Allows unlimited user profiles.
PT Pad (iPad) is an functional assessment app for therapists and nurses. Provides 3 free tests (Timed Up & Go), 6 Minute Walk, Berg Balance Scale). Other standard assessments require subscription. 7.99 for 30 days or 79.99 for 365 day purchase.
Monki Hide and Seek (iPhone /iPad ) for 2 + year olds is a hide and seek game with difference geographical areas as the scene where animals hide.
Check them out and see if they will support your OT mTool Kit.