Sky Island Explorer
Your sleep powers the wind. The deeper you rest, the further your airship drifts — discovering floating islands, ancient ruins, and forgotten skies.
Download on the App Store
"Long ago, the sky islands drifted freely — carrying ruins, forests, and forgotten stories.
No explorer has set foot on them in a century. Until now."
Get a good night's rest. HealthKit reads your sleep data automatically.
Open the app. Your sleep becomes 5 stats: Stamina, Focus, Creativity, Speed, and Luck.
Choose a route and tap Depart. Your airship explores while you live your day.
Check back to find new islands, gather resources, meet NPCs, and read story cards.
Your sleep quality translates into 5 stats that shape each day's exploration. Better sleep means further journeys.
5 weather conditions — from Sunny to Golden Wind — each with unique bonuses and rare material drops.
Explore 4 tiers of floating islands, from nearby quarries to legendary temples at the edge of the world.
Discover constellations tied to your sleep patterns. Collect them all on the Sky Map — rendered with zero image assets.
Meet 8 unique characters. Build relationships over weeks through 5 levels — from Stranger to Legend.
Three upgrade trees — Engine, Cargo, and Crew — each with 4 levels. Craft your way to legendary voyages.
~2 minutes a day. That's all it takes.
Review your stats, check the weather, pick a route, tap Depart. ~60 seconds.
Your airship explores on its own. Close the app, go live your life. A notification arrives when it returns.
See what your airship discovered. Read story cards, collect resources, apply upgrades. ~2 minutes.
The better you rest, the stronger your stats tomorrow. Good sleep means Golden Wind.
Platform
iPhone (iOS 18.0+)
Orientation
Portrait only
HealthKit
Read-only (optional)
Apple Watch
Enhanced, not required
Network
Fully offline
Server
None — on-device
No ads. No subscriptions. Pay once, explore forever.
| Feature | Free | Full Adventure |
|---|---|---|
| Tier 1–2 islands | ✓ | ✓ |
| Engine / Cargo / Crew Lv 1–2 | ✓ | ✓ |
| Story cards & NPC dialogue | ✓ | ✓ |
| 7-day exploration log | ✓ | ✓ |
| Tier 3–4 islands | — | ✓ |
| Full upgrade tree (Lv 3–4) | — | ✓ |
| NPC quests | — | ✓ |
| Unlimited log & sleep analytics | — | ✓ |
| CSV data export | — | ✓ |