LightsOn turns your real-world activity into a living city.
Every active calorie you burn — walking, running, working out, or just moving through your day — flows straight from Apple Health into your city's battery. Keep it charged and the lights stay on: new residents move in, the streets come alive, and your town grows. Let the battery run dry and the city goes dark — residents pack up and leave.
It's a cozy, idle city builder where YOU are the power plant.
HOW IT WORKS
• Your active energy from Apple Health charges the city automatically — no manual tracking, it just works in the background.
• Lights on → residents arrive and your town thrives.
• Battery empty → blackout, and people start to leave.
• Real workouts earn bonus credits to spend on upgrades.
• Build a factory that produces parts for bigger and better upgrades.
• Your city keeps running while you're away — come back to see how far it grew.
WHY YOU'LL LOVE IT
• A real reason to move: every step and workout has a visible payoff.
• Relaxed, no-pressure idle gameplay — perfect for short bursts.
• A charming isometric city that's entirely yours to grow.
• Clean, dark design that's easy on the eyes.
FREE & PRIVATE
• Completely free — no ads and no in-app purchases.
• No tracking and no data collection — your health data never leaves your device.
Move more, build more. How big can your city get?
It’s very nice and simple. Add a steps tracking feature.
Andyxgt
By adding a steps tracking feature you might keep users like myself more involved with the app. I workout 3 times a week but I also walk 2-3 times a week but not necessary with the workout app just lots of steps throughout the day.
Developer Response
Thanks for the review. Your steps will already charge the battery even if you don't record them as a workout. All your daily activities count like steps or climbing floors. It's basically all your activity calories. But only recorded workouts give extra credits.However displaying the steps per day could be interesting as a separate statistic.
Good concept, needs to go further
lrdjr
The idea of this game is fun and it’s nice that it keeps the user thinking about activity. The issue is that the game needs to go a bit more in depth. It doesn’t really feel like you’re building a city because there are not many unique things you can add to customize and make it feel like your own. If you could add attractions that also draw power but improve happiness that would be cool. Like a museum or a zoo or a park. Also it would be cool if the people who live in your city could have a little individuality such as a list of the residents names and maybe a generated fact or two about them. Those suggestions would be great ways to expand the idea to be less repetitive and more customizable without making it too complicated. Thanks for reading, I hope you consider implementing some of this feedback.
Developer Response
Thanks for the feedback. These ideas are great and many features will be added in the future (while still keeping the game simple enough). Another fun idea would be implementing themes where you could have a scifi or medieval city. Until then save up some credits.
Great concept. Has actually gotten me to exercise more.
Akfortyseven
I realize this is a pretty simple game right now, but it’s a fantastic concept, and has actually made a bit of a difference in my daily routine. Can’t wait to see how it evolves. Just expanded my town and I have to admit, I care about keeping it lit up!
Developer Response
Thanks for the review. There are more features planned to keep it interesting while keeping it simple.
Obsessed
Ectheon
I am obsessed with this app. So much fun to see my effort translated into this clever little sim world. Very fun…but I can also see how keeping the lights on could be challenging as the city gets bigger. Excited to see how the app evolves over time. Big fan!
• New: the Bank! Deposit your credits and they earn interest every day — the higher you upgrade the bank, the more it pays out. Withdraw any time, and give it your own look: Art Deco, Western or Futuristic, each in your favorite color.
• Look inside the Battery: the cell racks light up as far as your battery is charged, and you can watch the power flow through the cable ducts. At higher levels it grows a second and third hall. New for the battery: the Futuristic energy cell that glows at night.
• Factory boost with a battery limit: choose a charge level, and the boost switches itself off before your battery runs too low — even while the app is closed.
• New widgets for your streak: “Activity Streak” and “Battery & Streak” for the Home Screen, Lock Screen and Apple Watch.
• Streak protection from the Reserve Depot now costs a third less energy — plus bugfixes and various improvements.
Version 3.1.0
The developer, Jirko Cernik, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Jirko Cernik
Size
24 MB
Category
Health & Fitness
Compatibility
Requires iOS 18.0 or later.
iPhone Requires iOS 18.0 or later.
Mac Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.