A block swings over your tower. Tap to drop it. Whatever hangs over the edge breaks off, so every floor gets narrower, unless you land it perfectly. Read the wind, keep the tower level, anchor to passing clouds and ride out the storms.
No ads, no purchasesFully offlineiPhone & iPad · iOS 18+
How it works
Three floors of rules. That's it.
Sky Stack fits in one sentence and still takes a while to master. Every build stacks the same three steps.
1
Drop
Tap anywhere on the sky to let the swinging block fall. Prefer a button? Switch to the big DROP button in Settings.
2
Stack and adapt
Overhang is trimmed away. Perfect drops keep full width. The sky warns you before every gust and storm.
3
Upgrade
Spend the stars you earned in the Workshop, hire new builders and climb higher next time.
Signature mechanics
Four systems that make every tower different.
They are not power-ups you collect. They are the weather and physics of the sky, and they play off each other.
Wind gusts
Read the wind
A windsock and a banner warn which way the next gust will blow. While it blows, the block drifts and slides a little after it lands, so you drop early against the wind. Storm gusts hit much harder.
Tower lean
Keep it level
Every off-centre drop tilts the whole tower. A spirit level at the bottom of the screen shows how close it is to giving way. Past the red mark it topples, however wide your blocks are. Perfects pull it back.
Cloud anchors
Catch a cloud
Now and then a glowing cloud drifts past the top of the tower. Land a block while the cloud covers it and the tower anchors: the floor grows back to near full width and the lean resets to zero.
Storm bands · Sky Lantern
Weather the storm
From floor 10 a five-floor storm rolls in, then returns every twelve floors. Gusts get stronger and every floor pays double. Three perfects inside one storm light the Sky Lantern, and the next three blocks centre themselves.
The workshop
Five blueprints for a taller tower.
Stars come only from building: every floor, every perfect drop, every cloud anchor and every storm floor. Spend them on permanent plans.
Foundation
A wider base block gives you more room for mistakes.
58% → 78% width
Steady Hands
Widens the perfect zone so more drops snap into place.
±6 → ±15 pt
Windbreak
Weakens how far gusts push and slide your blocks.
100% → 30% gusts
Ballast
Lets the tower lean further before it topples.
lean 1.0 → 2.1
Star Charm
Every star you earn is worth more.
×1 → ×2.5 stars
The crew
Six builders, one free, five to hire.
Every builder plays the same. Each paints the tower in their own palette and rides along on every block you drop.
Sparrow
Small, quick and never afraid of heights.Free
Kite
Rides every gust like it was invited.150
Heron
Patient hands, perfectly level blocks.350
Aurora
Builds by the light of the northern sky.600
Comet
Leaves a trail of sparks on every floor.900
Zenith
Has already stood where the sky ends.1,500
See it in action
Straight from the game.
Real captures from Sky Stack on iPhone.
Your skyline grows with your recordShift briefing before every buildDrop under the cloud to anchorEvery build gets an inspection reportBlueprints in the workshopSwipe through the crewLogbook, chart and stampsAn illustrated guide to every rule
Platforms
Built for iPhone and iPad.
No account, no login, no connection required. Your towers, stars and builders are stored on your device only.
📱 iPhone📲 iPad, every orientation⚙️ iOS 18 or later✈️ Fully offline🤲 Haptic feedback🚫 No ads, no tracking
We're here to help
Support
Stuck on a storm, found a bug, or have an idea for new weather? Write to us and we will get back to you as soon as we can.
No. Sky Stack is fully offline. Upgrades, builders and records live on your device.
Can I buy stars?
No. There are no in-app purchases. Every star is earned by building.
My tower topples even though the blocks are wide.
That is the lean. Off-centre drops add up even when little gets trimmed. Land perfects or anchor to a cloud to level it, and buy Ballast to raise the limit.
The wind makes me miss.
Watch the windsock: it turns before the gust starts. Drop a little early on the side the wind is coming from, or build the Windbreak plan.
I switched phones. Where is my progress?
Progress is stored locally. Restore the new device from an iCloud or computer backup to bring it along.
Sky Stack ("the App", "we", "us") is a stacking game for iPhone and iPad. This policy explains what information the App handles and how. The short version: the App works entirely on your device and does not collect, transmit or sell personal data.
Information we receive
The App does not require an account and does not ask for your name, email, location, contacts, photos or any other personal information. It contains no advertising or third-party analytics and makes no network requests of its own.
Data stored on your device
Game progress (stars, upgrade levels, hired builders, best scores and heights, build history and achievements) and your preferences (control scheme, haptics) are stored locally using Apple's on-device storage. This data never leaves your device unless you include it in a backup you control.
Apple services
If you download the App from the App Store, Apple may collect information such as crash reports or usage statistics according to your device settings and Apple's privacy policy. We receive only aggregated, anonymised reports that Apple makes available to developers.
Your choices
You can erase all game data at any time from Settings inside the App ("Reset") or by deleting the App. Haptic feedback can be switched off in the same Settings sheet.
Children's privacy
The App is suitable for all ages and does not knowingly collect any information from anyone, including children under 13.
Changes and contact
If this policy changes, the updated version will be published on this page with a new date. Questions: [email protected].
TERMS OF USELAST UPDATED 20 OCT 2026
Acceptance
By downloading or playing Sky Stack ("the App"), you agree to these Terms of Use. If you do not agree, please do not use the App.
License
We grant you a personal, non-transferable, non-exclusive, revocable licence to install and play the App on Apple devices that you own or control, as permitted by the App Store Terms of Service. You may not copy, modify, reverse engineer, distribute or create derivative works from the App except where the law expressly allows it.
Virtual items
Stars, builders and upgrades are virtual items earned solely by playing. They have no monetary value, cannot be purchased, sold, transferred or exchanged for real money, and may be reset by you at any time from Settings.
Acceptable use
Do not use the App in any way that violates applicable law, interferes with its operation, or attempts to extract its source code or artwork.
Disclaimer and limitation of liability
The App is provided "as is" without warranties of any kind. To the fullest extent permitted by law, we are not liable for any indirect, incidental or consequential damages arising from your use of, or inability to use, the App. Our total liability for any claim relating to the App will not exceed the amount you paid for it, which is zero.
Changes and contact
We may update the App and these Terms from time to time. Continued use after an update means you accept the revised Terms. Questions: [email protected].
Wind gusts
Tower lean
Cloud anchors
Storm bands · Sky Lantern
150
