I love Toca Boca apps! Toca Boca does such a great job of developing clever, creative, interesting, and engaging apps for young children. Right now, they are offering Toca Robot Lab for free download for a limited time! Normally, this app is $1.99.
You get to build your own robot and test out your creation. I love that this developer never has intrusive ads or in-app purchases. Just good fun for your little one and another great app from an award winning developer. I also linked the ongoing free Toca Boca apps above.
Highly recommended for ages 3 and up. Grab this while it is still free!