Comparison

iO vs Booster Up!

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

Head to head
About

iO

A physics-based platformer where you manipulate size, speed, and momentum to solve over 225 challenging mazes. Features unique gameplay mechanics like portals and inverted gravity, with global leaderboards for competitive play.

Highlights
  • Size, weight, and mass manipulation
  • Over 225 challenging mazes
  • Portals and inverted gravity
  • Global leaderboards
  • Unlockable achievements
  • Intuitive touch controls
Features
Read full description

** Global Game Jam 2012 Winner ** ** IndieCade Festival 2014 Finalist ** ** GDC Best In Play 2015 - Honorable Mention ** TouchArcade: 4 out of 5 - "For those who enjoy playing with balls, iO has plenty to show you." AppleNApps: 4 out of 5 - "iO is a finely crafted platformer that keeps things fresh making it well worth picking up." Gamezebo: 4 out of 5 - "It's packed with unique style and mechanics that give it an edge over similar titles." iO - A Physics Platformer A physics platformer about size, speed and momentum unlike anything you’ve ever seen before! Grow, shrink, roll, leap and climb in this unique puzzler featuring over 225 challenging mazes one-of-a-kind gameplay that includes portals, inverted gravity, vehicles and more! Share your times with friends on the global leaderboards and become a time/space legend! FEATURES - Play with size, weight and mass to reach the exit as fast as possible! - Over 225 puzzles to solve and more coming in future updates. - Intuitive touch controls. - Make new friends and compete against old ones on the Global Leaderboards. - Unlock new achievements. - Unique and wide variety of gameplay mechanics including gravity manipulation, portals, vehicles and more! - Retro-futuristic visuals.

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

Screenshots

iO4 screens
Booster Up!4 screens

Verdict

The call

The clearest difference is review sentiment: iO at 71% against Booster Up!'s 19%. iO also leads on ads (none vs shown). Booster Up!'s advantage is rating (4.6 vs 3.7) and update cadence (weekly vs every 6 weeks). On price, in-app purchases, monetization model 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. iO sells 1 one-off in-app purchase and Booster Up! sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Booster Up! holds the better App Store score, 4.6 against 3.7. That said, the two scores are not equally well evidenced: Booster Up! has 17K ratings behind it against 19, so its average is the more settled of the two. Written reviews complicate that: 71% of iO's written reviews are positive against 19% of Booster Up!'s, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

iO ships an update every 6 weeks, Booster Up! weekly. The most recent releases landed on November 1, 2026 and November 9, 2026 respectively.

Scorecard5 real differences · 5 level
iO versus Booster Up!: the parameters behind the verdict, then further details
ParameteriOBooster Up!
PriceFreeFree
Rating3.7 (19 ratings)4.6 (17K ratings) — better
Positive reviews71.1% of reviews — better19.2% of reviews
Number of ratings1917K — better
Update frequencyEvery 6 weeksWeekly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.011.0
Further details — not scored
Size466 MB400 MB
Age rating4+12+
DeveloperGamious B.V.Rollic Games

Customer experience

iO

All ratings19 ratings
Positive63.2%
Neutral5.3%
Negative31.6%
Written reviews76 reviews
Positive71.1%
Neutral3.9%
Negative25.0%

Booster Up!

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

User reviews

iO

From 19 App Store ratings

What we love

  • 👍 Fun and addictive gameplay
  • 💡 Challenging puzzles
  • 🧠 Good for brain exercise
  • ✨ Great design and idea
  • 💯 Addictive and engaging

Room to improve

  • ❌ Unplayable due to ads
  • 💸 Paid for ad-free, still shows ads
  • 🐛 Game crashes frequently
  • 🐞 Buttons cut off on mobile
  • 🔇 No audio or sound effects

Booster Up!

From 17K App Store ratings

What we love

  • 🚀 Fun and challenging gameplay
  • 🚀 Simple and intuitive controls
  • 👍 Visually appealing graphics

Room to improve

  • 🐛 Frequent bugs and glitches
  • 💸 Excessive in-app advertisements
  • 🔒 Requires internet connection to play
  • 🔋 High battery consumption

Bugs and requests

iO

Reported bugs

8 issues
  • Ads not unlocking levels
  • Paid ad-free, but ads persist
  • Game crashes on startup or during gameplay
  • Buttons cut off at screen edges
  • Player phasing through walls
Show 3 more
  • Game Center notifications are spammy
  • Laggy performance
  • App shuts down after logos

Requested features

8 requests
  • Fix ad-blocking payment issue
  • Improve mobile formatting
  • Add audio and sound effects
  • Fix ad-related progression blockers
  • Address crashing issues
Show 3 more
  • Improve performance and reduce lag
  • Fix phasing through walls bug
  • Reduce spammy notifications

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

In-app purchases

1 purchases

iO

One-time1
  • Remove all advertisements$0.99
10 purchases

Booster Up!

One-time10
  • Beginners Pack$0.99
  • Diamond - 3M$1.99
  • No ADS$3.99
Show 7 more
  • Special Module Pack$4.99
  • 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
  • Explorer’s Pack with No Ads$24.99

Questions

Is iO free?
iO is free to download, with in-app purchases available.
Is Booster Up! free?
Booster Up! is free to download, with in-app purchases available.
Which has better reviews, iO or Booster Up!?
Booster Up! is rated higher. iO averages 3.7 out of 5 from 19 ratings, while Booster Up! averages 4.6 from 17K ratings.
Do iO or Booster Up! have ads?
Booster Up! shows ads; iO does not.
Which is updated more often, iO or Booster Up!?
iO ships an update every 6 weeks, and Booster Up! weekly. Most recently, iO was updated on November 1, 2026 and Booster Up! on November 9, 2026.

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