iO vs 4=10
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- Size, weight, and mass manipulation
- Over 225 challenging mazes
- Portals and inverted gravity
- Global leaderboards
- Unlockable achievements
- Intuitive touch controls
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** 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.
4=10
A casual number puzzle game for all ages. Combine four given numbers using basic math operations to reach the target of 10. It offers a relaxing experience that improves mental math skills and number familiarity.
- Combine four numbers to equal 10
- Basic math operations
- Gradually increasing difficulty
- One-handed play
- Improves mental math skills
- Relaxing and soothing gameplay
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4=10 is a simple number puzzle game suitable for all ages. The objective is to use four given numbers and combine them in an expression that equals 10. For example, you can solve it by adding 1, 2, 3, and 4 together (1+2+3+4=10). The game relies on basic math operations and starts off easy, gradually increasing in difficulty. It's designed to be a relaxed and soothing experience. You can play it with just one hand, using your phone whenever and wherever you like. By playing this game, you'll become more comfortable with numbers and improve your basic math skills, including mental calculations, using parentheses, and following the correct order of operations. Enjoy the game and happy calculating! :)
Screenshots
Verdict
The clearest difference is rating: 4=10 at 4.9 against iO's 3.7. 4=10 also leads on review sentiment (98% vs 71%) and ratings volume (2.6K vs 19). On price, update cadence, ads and in-app purchases 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
Both are free to download. iO sells 1 one-off in-app purchase and 4=10 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
4=10 holds the better App Store score, 4.9 against 3.7. That said, the two scores are not equally well evidenced: 4=10 has 2.6K ratings behind it against 19, so its average is the more settled of the two. Written reviews point the same way: 71% of iO's written reviews are positive against 98% of 4=10's.
iO ships an update every 6 weeks, 4=10 every 2 months. The most recent releases landed on October 15, 2026 and October 17, 2026 respectively.
| Parameter | iO | 4=10 |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (19 ratings) | 4.9 (2.6K ratings) — better |
| Positive reviews | 71.1% of reviews | 97.9% of reviews — better |
| Number of ratings | 19 | 2.6K — better |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 466 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Gamious B.V. | Sveinn Steinarsson |
Customer experience
iO
4=10
User reviews
iO
From 19 App Store ratingsWhat 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
4=10
From 2.6K App Store ratingsWhat we love
- 👍 Simple and fun
- 🧠 Helps improve math skills
- 🔒 No ads or in-app purchases
- 💡 Challenging yet relaxing
Room to improve
- 🤔 Some levels too easy
- 🤯 Can get repetitive at times
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 moreShow fewer
- 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 moreShow fewer
- Improve performance and reduce lag
- Fix phasing through walls bug
- Reduce spammy notifications
4=10
Reported bugs
1 issue- None reported
Requested features
2 requests- Add more difficulty levels
- Introduce new gameplay modes
In-app purchases
iO
- Remove all advertisements$0.99
4=10
- 4≠10 add-on$3.99









