Comparison

Booster Up! vs ZapStack

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Booster Up!

Embark on an intergalactic adventure by merging rocket modules to create powerful spacecraft. Launch your rocket, explore planets, collect rewards, and upgrade components to fly farther and overcome challenges.

Highlights
  • Merge rocket modules
  • Launch and explore planets
  • Collect rewards and stars
  • Upgrade rocket components
  • Unlock new rockets
  • Overcome space challenges
Features
Read full description

Prepare for an intergalactic journey in this exhilarating game! Start with a basic rocket and upgrade it by merging different modules. Then, launch your rocket into space and explore various planets.  During your space flight, swipe your rocket towards gift boxes in different directions to earn rewards.  Collect stars to upgrade your rocket's heat shield, fuel or booster and fly even farther for explore the space! As you fly deep into space, earn money to unlock new rockets and visit different planets.  Find the VIP boxes and launch toward to them and earn special items and power-ups to give you an edge on your journey.  With each new planet, you'll encounter unique challenges and obstacles, but don't worry, your upgraded rocket and modules will help you overcome them. But that's not all! As you collect more stars, you'll also unlock the ability to upgrade your modules of your rocket!  From high-boost rockets that can travel at lightning speeds to high-fuel rockets that can fly even the frontier the space, the possibilities are endless. So what are you waiting for? Strap in and blast off into a galaxy full of adventure with this exciting game.  It's time to boosters up and explore the final frontier! By downloading Booster Up! you are agreeing to our terms of service; https://www.rollicgames.com/terms

About

ZapStack

A one-tap precision platformer where timing is crucial to build the tallest tower. Land perfectly to keep platforms open, or drift and face shrinking gaps. Compete with friends and unlock new themes.

Highlights
  • One-tap precision jumping
  • Swinging platform mechanics
  • Perfect landing bonuses
  • Unlockable themes
  • Game Center leaderboards
  • Share high scores
Features
Read full description

How high can you stack? ZapStack is a one-tap precision platformer where every landing counts. Platforms swing back and forth — tap to jump through the gap and lock them into your tower. Land dead center and the gap stays wide. Drift off-center and it shrinks. The further you go, the less room for error. Simple to pick up. Hard to put down. HOW TO PLAY - Tap anywhere to jump - Time your jump to fly through the gap in each swinging platform - Each locked platform adds to your tower - Hit dead center for a Perfect — keep the gap at full width - Land off-center and the gap narrows - Miss the gap entirely and it's game over PRECISION MATTERS Every millimeter of drift costs you. A perfect run keeps the gap wide open. A sloppy run turns it into a needle's eye. Your skill is written into every platform you stack. THEMES Play in the bright Daytime world or hop into the Easter Bunny theme — basket weave platforms, a bunny player, and spring meadow skies. More themes arrive automatically, no app update needed. COMPETE Climb the Game Center leaderboard. Beat your personal best. Share your best tower with friends. ZapStack is free to play with no ads and no paywalls. Just you, your reflexes, and a growing tower.

Screenshots

Booster Up!4 screens
ZapStack4 screens

Verdict

The call

The clearest difference is review sentiment: ZapStack at 100% against Booster Up!'s 19%. ZapStack also leads on in-app purchases (none vs 14) and ads (none vs shown). Booster Up!'s advantage is ratings volume (17K vs 1) and iOS requirement (11.0 vs 15.6). On price, update cadence and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Booster Up! sells 14 one-off in-app purchases. ZapStack asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

ZapStack holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Booster Up! has 17K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 19% of Booster Up!'s written reviews are positive against 100% of ZapStack's.

UpkeepUpdate frequency

Booster Up! ships an update weekly, ZapStack every 4 days. The most recent releases landed on October 20, 2026 and October 10, 2026 respectively.

Scorecard7 real differences · 3 level
Booster Up! versus ZapStack: the parameters behind the verdict, then further details
ParameterBooster Up!ZapStack
PriceFreeFree
Rating4.6 (17K ratings)5.0 (1 ratings) — better
Positive reviews19.2% of reviews100.0% of reviews — better
Number of ratings17K — better1
Update frequencyWeeklyEvery 4 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS11.0 — better15.6
Further details — not scored
Size400 MB5 MB
Age rating12+4+
DeveloperRollic GamesIndus Siam LLC

Customer experience

Booster Up!

All ratings17,262 ratings
Positive90.5%
Neutral4.0%
Negative5.4%
Written reviews339 reviews
Positive19.2%
Neutral21.5%
Negative59.3%

ZapStack

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Booster Up!

Reported bugs

5 issues
  • Rocket parts disappearing after upgrades
  • Inability to reach or progress past certain planets
  • Inconsistent reward payouts
  • Game freezing or crashing
  • Saved progress not loading correctly

Requested features

4 requests
  • Offline play mode
  • More diverse rocket and module options
  • Improved progression system
  • Better reward balancing

ZapStack

Not enough reviews yet to summarise bugs or requests.

In-app purchases

14 purchases

Booster Up!

One-time14
  • Beginners Pack$0.99
  • Money - 50M$1.99
  • Diamond - 3M$1.99
Show 11 more
  • No ADS$3.99
  • Special Module Pack$4.99
  • Skip It - 60x$5.99
  • Diamond - 25M$5.99
  • Adventurer’s Pack$6.99
  • Adventurer's Pack with No-Ads$9.99
  • Astronaut’s Pack$12.99
  • Astronaut’s Pack with No Ads$14.99
  • Explorer’s Pack$19.99
  • Diamond - 150M$19.99
  • Explorer’s Pack with No Ads$24.99
None

ZapStack

No in-app purchases

Questions

Is Booster Up! free?
Booster Up! is free to download, with in-app purchases available.
Is ZapStack free?
ZapStack is free to download, with no in-app purchases.
Which has better reviews, Booster Up! or ZapStack?
ZapStack is rated higher. Booster Up! averages 4.6 out of 5 from 17K ratings, while ZapStack averages 5.0 from 1 ratings.
Do Booster Up! or ZapStack have ads?
Booster Up! shows ads; ZapStack does not.
Which is updated more often, Booster Up! or ZapStack?
Booster Up! ships an update weekly, and ZapStack every 4 days. Most recently, Booster Up! was updated on October 20, 2026 and ZapStack on October 10, 2026.

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