Paleo Planet Sim

Build a planet. Run its climate. Watch its weather. Paleo Planet Sim runs real research models on worlds you design. Two divisions, read off your settings: Earth-like keeps the sun, the greenhouse, the tilt and the day length inside what Earth itself has been through; push any of them past that and the planet is Extreme, everything the model can survive. Each slider shows where Earth's range ends, the app tells you which division you're in before you launch, and you can lock either one. Set the sun, the greenhouse, the tilt, the length of the day and the depth of the ocean, then pick a geography: Earth, Pangea and other ancient Earths, an all-ocean world, a supercontinent, or paint your own continents with the terrain brush (Apple Pencil supported). Launch it and a real climate model runs 45 simulated years in the cloud while you do something else. You'll get a notification when it finishes, usually in 1.5 to 3.5 hours. Explore the result on a 3-D globe: temperature, biomes, terrain, snow and rain, month by month, with a magnifier to read any spot. See the records your planet set, its climate charts and maps, and compare any two planets side by side. Then make weather. Pick a moment from your planet's own history and run a real weather model for 5, 10 or 15 days. Watch clouds, rain and snow, wind, the jet stream and tropical cyclones move across your globe and map. Every valid planet is ranked on the leaderboards, with gold, silver and bronze for each record. Time-limited challenges set one goal, one deadline and in-app prizes. Looking is free: spin the reference planets, play their forecasts and browse every board. Runs use credits. You start with 5; a planet is 1 credit and a forecast is 1 per 5 days. Prices are always shown before you launch. Made by a PhD atmospheric scientist.