# Zero Below Zero vs o

The clearest difference is in-app purchases: o at none against Zero Below Zero's 1. o also leads on update cadence (every 5 days vs every 6 months) and iOS requirement (11.0 vs 14.3). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Zero Below Zero sells 1 one-off in-app purchase. o asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Zero Below Zero against 5.0 for o. Both are backed by a comparable volume of ratings — 6 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Zero Below Zero ships an update every 6 months, o every 5 days. The most recent releases landed on June 1, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Zero Below Zero | o |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (6 ratings)](https://appshunter.io/ios/app/zero-below-zero/id1512598160/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/o-o-o/id6443790066/reviews) |
| Number of ratings | **6** | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 4 MB | 247 MB |
| Requires iOS | 14.3 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Omar Fahmy](https://appshunter.io/developer/1512598159) | [Play XD Ltd.](https://appshunter.io/developer/1649283052) |

## What reviewers say

### Zero Below Zero

[App page](https://appshunter.io/ios/app/zero-below-zero/id1512598160)

A challenging puzzle game with simple mechanics but extreme difficulty. Achieve a perfect score on free levels to unlock the rest at no cost. No hints are provided, requiring strategic thinking to solve each unique circle-based puzzle.

**Highlights:** Extremely challenging gameplay, Unique circle-based puzzles, Free levels unlockable, No hints provided, Inspired by math puzzles

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all levels | $3.99 | one-time |


### o

[App page](https://appshunter.io/ios/app/o-o-o/id6443790066)

A tactical turning strategy game where players rotate discs to chain colors and clear lines for high scores. Earn perks like Rewind and Bombs to enhance gameplay. Designed with minimalist aesthetics and a calming soundtrack, it offers a challenging yet relaxing experience.

**Highlights:** Disc rotation for color chaining, Perk system for enhanced gameplay, Minimalist design and ambient soundtrack, Leaderboard challenges, Achievement system

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Zero Below Zero free?

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

### Is o free?

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

### Which has better reviews, Zero Below Zero or o?

Zero Below Zero and o are both rated 5.0 out of 5 on the App Store, from 6 and 3 ratings respectively.

### Do Zero Below Zero or o have ads?

Neither Zero Below Zero nor o shows ads.

### Which is updated more often, Zero Below Zero or o?

Zero Below Zero ships an update every 6 months, and o every 5 days. Most recently, Zero Below Zero was updated on June 1, 2026 and o on September 13, 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.*