# iO vs circloO

The clearest difference is rating: circloO at 4.8 against iO's 3.7. circloO also leads on ratings volume (2.4K vs 19) and review sentiment (89% vs 71%). iO's advantage is ads (none vs shown). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. iO sells 1 one-off in-app purchase and circloO sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

circloO holds the better App Store score, 4.8 against 3.7. That said, the two scores are not equally well evidenced: circloO has 2.4K 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 89% of circloO's.

iO ships an update every 6 weeks, circloO every 2 months. The most recent releases landed on June 9, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | iO | circloO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (19 ratings)](https://appshunter.io/ios/app/io-a-physics-platformer/id960831187/reviews) | **[4.8 (2.4K ratings)](https://appshunter.io/ios/app/circloo-physics-platformer/id1612957699/reviews)** |
| Number of ratings | 19 | **2.4K** |
| Positive reviews | 71.1% of reviews | **89.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 466 MB | 63 MB |
| Requires iOS | 11.0 | **10** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gamious B.V.](https://appshunter.io/developer/539181337) | [Florian van Strien](https://appshunter.io/developer/1603079263) |

## What reviewers say

### iO

[App page](https://appshunter.io/ios/app/io-a-physics-platformer/id960831187)

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:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove all advertisements | $0.99 | one-time |


### circloO

[App page](https://appshunter.io/ios/app/circloo-physics-platformer/id1612957699)

A colorful physics platformer where you guide a ball through growing circular levels. Collect circles to expand the play area, strategically using and avoiding obstacles. Discover unique physics mechanics and enjoy a vast collection of player-created levels.

**Highlights:** Circular physics puzzles, Level editor, Player-created levels, Unique physics mechanics, Growing levels, Hard Mode levels

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |

**What reviewers like**

- 👍 Relaxing and enjoyable gameplay
- 🎨 Creative and unique levels
- 🎶 Calming background music
- 🧠 Challenging but not impossible
- 🕹️ Smooth and responsive controls

**What reviewers complain about**

- 🔍 Occasional performance issues
- 🕹️ Difficulty can be inconsistent
- 📺 Ads can be disruptive at times
- 🤑 Lack of free content/levels

**Reported bugs**

- Glitches with level progression
- Inconsistent touch/click registration

**Requested features**

- More levels and content updates
- Character customization options
- Improved level editor tools
- Difficulty settings or options


## Frequently asked questions

### Is iO free?

iO is free to download, with in-app purchases available.

### Is circloO free?

circloO is free to download, with in-app purchases available.

### Which has better reviews, iO or circloO?

circloO is rated higher. iO averages 3.7 out of 5 from 19 ratings, while circloO averages 4.8 from 2.4K ratings.

### Do iO or circloO have ads?

circloO shows ads; iO does not.

### Which is updated more often, iO or circloO?

iO ships an update every 6 weeks, and circloO every 2 months. Most recently, iO was updated on June 9, 2026 and circloO on September 26, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*