Sky StackBuild above the clouds.
A block swings over your tower. Tap to drop it. Whatever hangs over the edge breaks off, so every floor is a little narrower than the last, unless you land it perfectly. Read the wind, keep the tower straight, anchor to passing clouds and ride out the storms.
One tap. One block. One very tall tower.
Sky Stack is a pick-up-and-play stacking game. The controls fit in one sentence, but the sky has opinions: gusts push your block, the tower leans with every sloppy drop, and storms roll in just when you are getting comfortable.
Precision stacking
Overhang is trimmed away. Land within the perfect zone and the block snaps into place at full width, and perfect streaks multiply your score.
Stars are your economy
Every floor pays stars. Perfects, cloud anchors and storm floors pay more. Spend them in the Workshop and on new builders.
Permanent progress
A wider foundation, steadier hands, windbreaks, ballast and a star charm: five upgrades that turn ten floors into fifty.
Three steps, every build.
Drop
Tap anywhere to let the swinging block fall. Prefer a dedicated control? Switch to the big drop button in Settings.
Stack & adapt
Watch the banners and the lean meter. The sky always warns you before a gust or a storm arrives.
Upgrade
Spend stars in the Workshop, unlock builders with their own block colours and climb higher next time.
Four systems that make every tower different.
These are not power-ups you pick up. They are the weather and physics of the sky, and they play off each other.
Wind Gusts
A banner warns which way the next gust will blow. While it blows, the swinging block drifts and slides a little after it lands, so you drop early against the wind. Storm gusts are much stronger.
Tower Lean
Every off-centre drop tilts the whole tower. The lean meter shows how close it is to giving way. Push past the limit and it topples, however wide your blocks are. Perfects pull it back toward centre.
Cloud Anchors
Now and then a cloud drifts across the top of the tower. Land a block while the cloud covers it and the tower anchors: the block grows back to near full width and the lean resets to zero.
Storm Bands & Sky Lantern
From floor 10, a five-floor storm returns every twelve floors. The sky darkens, gusts get stronger and every floor pays double. Three perfects inside one storm light the Sky Lantern, and the next three blocks centre themselves.
Six builders, one free, five to earn.
Every builder plays the same. Each one paints the tower in their own palette. Unlock them with stars you earned yourself.
Sparrow
Small, quick and never afraid of heights. · FreeKite
Rides every gust like it was invited. · 150 starsHeron
Patient hands, perfectly level blocks. · 350 starsAurora
Builds by the light of the northern sky. · 600 starsComet
Leaves a trail of sparks on every floor. · 900 starsZenith
Has already stood where the sky ends. · 1,500 starsStraight from the game.
Real captures from Sky Stack on iPhone.
Built for iPhone and iPad.
Sky Stack runs fully offline. There is no account, no login and no connection required. Your progress is stored on your device only.
Support
Contact us
Something not working, or an idea for a new kind of weather? Email us and we will get back to you as soon as we can:
[email protected]Frequently asked questions
Do I need an internet connection to play?
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 keeps toppling even though the blocks are wide.
That is the lean. Off-centre drops add up even when nothing gets trimmed much. Land perfects or anchor to a cloud to straighten it, and buy Ballast in the Workshop to raise the limit.
The wind makes me miss.
Watch the banner: it tells you the gust direction before it starts. Drop a little early on the side the wind is coming from, or upgrade Windbreak.
I switched phones. Where is my progress?
Progress is stored locally on the device. Restore the device from an iCloud or computer backup to bring it along.
Something crashed or looks wrong.
Write to [email protected] with your device model and iOS version, or use reportaproblem.apple.com.
Privacy Policy
Last updated: October 20, 2026
Overview
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 does not contain advertising or third-party analytics and makes no network requests of its own.
Data stored on your device
Game progress (stars, upgrade levels, unlocked builders, best scores and heights, build history and achievements) and your preferences (control scheme, haptics) are stored locally on your device using Apple's on-device storage. This data never leaves your device unless you include it in a device 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 progress") or by deleting the App. Haptic feedback can be switched off in the same Settings screen.
Children's privacy
The App is suitable for all ages and does not knowingly collect any information from anyone, including children under 13.
Changes
If this policy changes, the updated version will be published on this page with a new "Last updated" date.
Contact
Questions about privacy: [email protected].
Terms of Use
Last updated: October 20, 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 currency
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 assets.
Disclaimer & 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
We may update the App and these Terms from time to time. Continued use of the App after an update means you accept the revised Terms.
Contact
Questions about these Terms: [email protected].