# Ouroboros vs Donut Stack Sort

Ouroboros and Donut Stack Sort both sit at 4.6 stars, but that hides the real split: 85% of Ouroboros's written reviews are positive against 26% of Donut Stack Sort's. Ouroboros also leads on in-app purchases (none vs 19). Donut Stack Sort's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 5 months). On price, rating and device support there is nothing between them.

Both are free to download. Donut Stack Sort sells 19 one-off in-app purchases. Ouroboros asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Ouroboros against 4.5 for Donut Stack Sort. That said, the two scores are not equally well evidenced: Donut Stack Sort has 168 ratings behind it against 10, so its average is the more settled of the two. Written reviews are what separate them: 85% of Ouroboros's written reviews are positive against 26% of Donut Stack Sort's.

Ouroboros ships an update every 5 months, Donut Stack Sort every 3 weeks. Both last shipped on October 21, 2026.

## The numbers

| Metric | Ouroboros | Donut Stack Sort |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (10 ratings)](https://appshunter.io/ios/app/ouroboros-infinity-puzzle/id1153775037/reviews)** | [4.5 (168 ratings)](https://appshunter.io/ios/app/donut-stack-sort/id6476919327/reviews) |
| Number of ratings | 10 | **168** |
| Positive reviews | **84.6% of reviews** | 25.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 111 MB | 429 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OA+ LLC](https://appshunter.io/developer/1153775036) | [Tran Tien Thanh](https://appshunter.io/developer/1713107024) |

## What reviewers say

### Ouroboros

[App page](https://appshunter.io/ios/app/ouroboros-infinity-puzzle/id1153775037)

Connect block pieces to form loops and score points in this addictive puzzle game. Inspired by classic brain training challenges, it offers endless ways to test your logic and creativity. Unlock new themes and compete with friends on the global leaderboard.

**Highlights:** Connect block pieces, Form and complete loops, Offline play, Unlockable themes, Global leaderboard, Relaxing gameplay

**Features:** macOS Compatibility

**In-app purchases:** none


### Donut Stack Sort

[App page](https://appshunter.io/ios/app/donut-stack-sort/id6476919327)

A minimalistic puzzle game where players merge hexagonal number blocks to create higher numbers. This addictive game challenges your brain, improving memory, concentration, and reflexes.

**Highlights:** Hexagon number block merging, Mind-sharpening gameplay, Improves memory and concentration, Addictive puzzle experience, Minimalistic design

**Features:** macOS Compatibility

**In-app purchases (19)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coin 1 | $0.99 | one-time |
| Premium Skin 2 | $0.99 | one-time |
| Premium Skin 1 | $0.99 | one-time |
| Remove ads | $1.99 | one-time |
| Super Spin | $3.99 | one-time |
| Ticket 1 | $3.99 | one-time |
| Coin 2 | $4.99 | one-time |
| No ads bundle | $4.99 | one-time |
| Mini Bundle | $4.99 | one-time |
| Piggy bank | $4.99 | one-time |
| Safe Pack | $4.99 | one-time |
| Ticket 2 | $7.99 | one-time |
| Coin 3 | $9.99 | one-time |
| One Plus One | $9.99 | one-time |
| Large Bundle | $9.99 | one-time |
| Ultimate Donut Pass | $9.99 | one-time |
| All bundle | $19.99 | one-time |
| Coin 4 | $29.99 | one-time |
| Coin 5 | $49.99 | one-time |

**What reviewers like**

- 👍 Fun and addictive gameplay
- 🎨 Beautiful design and graphics
- 💡 Good core game mechanics
- 💖 Enjoyable for anxiety relief

**What reviewers complain about**

- 广告 Excessive and intrusive ads
- 💸 Deceptive advertising practices
- 😩 Ads cover half the screen
- ✋ Ads block gameplay
- ❌ Ads prevent game progression

**Reported bugs**

- Ads freeze the game
- Ads don't close
- Ads appear mid-game and block screen
- Purchased ad-free experience still has ads
- In-app purchases not credited (e.g., coins)

**Requested features**

- More levels needed
- Update the game with new content
- Fix the ad issue
- Improve ad removal value
- Change or remove the white donut (hard to see)


## Frequently asked questions

### Is Ouroboros free?

Ouroboros is free to download, with no in-app purchases.

### Is Donut Stack Sort free?

Donut Stack Sort is free to download, with in-app purchases available.

### Which has better reviews, Ouroboros or Donut Stack Sort?

Ouroboros is rated higher. Ouroboros averages 4.6 out of 5 from 10 ratings, while Donut Stack Sort averages 4.5 from 168 ratings.

### Do Ouroboros or Donut Stack Sort have ads?

Ouroboros shows ads; Donut Stack Sort does not.

### Which is updated more often, Ouroboros or Donut Stack Sort?

Ouroboros ships an update every 5 months, and Donut Stack Sort every 3 weeks. Most recently, Ouroboros was updated on October 21, 2026 and Donut Stack Sort on October 21, 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.*