Most of your kids wont be interesting in coding but these games can improve problem-solving and thinking skills which is important to kids
Most of these apps are available in multiple platforms like iOS, Mac, Android, PC, few games are free and few cost. It depends which one you gonna choose.(Links will open in new tab)
Free or Demo
Lightbot and Lightbot Jr.
Age: 4-8 (Lightbot.Jr), 9+ (Lightbot)Android: Light Bot
iOS: Light Bot
Web Browser: Lightbot.com
Pricing: Free (Browser), $3(iOS/Android)
Kodable
Age: 5-8iOS: Kodable
Web Browser: Kodable.com
Pricing: Free( $7 for Pro version)
Robozzle
Age: 6+Android: Robozzle
iOS: Robozzle
Windows: Robozzle
Web Browser: Robozzle.com
Pricing: Free (1$ for Windows)
Cargo-Bot
Age: 5+iOS: Cargo-Bot
Pricing: Free
SpaceChem
Age: 10+Android: SpaceChem Mobile
Steam: SpaceChem
iOS: SpaceChem Mobile
Web Browser: zachtronics.com/spacechem/
Pricing: Free demo , ($10 for steam, $3 for iOS/Android)
Code Combat
Age: 13+Web Browser: codecombat.com
Pricing: Free
Machineers
Age: 8-14Web Browser: machineers.com
Pricing: Free demo
Bee-Bot
Age: 4-7iOS : Bee-Bot
Pricing : Free
Paid
Code Monkey Island
Age: 8+Web Browser: codemonkeyplanet.com
Kickstarter: Code Monkey Island
Robot Turtles
Age:3-8Web Browser: thinkfun.com/robotturtles/
Pricing: $25