Sandbox is a simple and easy to use paint by number pixel app. After you find a picture that you like, you will see the picture as a different set of numbered pixels. All you have to do, is select the colour from the numbered colour palette and colour in the areas of the same number, it’s fun and as simple as that.
It is free to use but you will have to deal with the occasional advert.
If you would rather print out and colour something on paper then you should visit the Aspie Heroes Colouring Pages Page here: https://www.aspieheroes.com/colouring-pages
Sandbox can be downloaded by clicking on the icons below: