# Zero/Sum vs Sum

The clearest difference is rating: Sum at 5.0 against Zero/Sum's 4.2. Sum also leads on update cadence (every 3 days vs every 2 months). Zero/Sum's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Sum sells 1 in-app purchase, starting at $1.99 per month. Zero/Sum asks for nothing beyond the download.

Sum holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Zero/Sum has 27 ratings behind it against 1, so its average is the more settled of the two.

Zero/Sum ships an update every 2 months, Sum every 3 days. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Zero/Sum | Sum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (27 ratings)](https://appshunter.io/ios/app/zerosum/id1200231665/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sum-math-puzzle-brain-game/id6450458099/reviews)** |
| Number of ratings | **27** | 1 |
| Positive reviews | 53.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 973 MB | 20 MB |
| Requires iOS | **8.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Sean Kearney](https://appshunter.io/developer/944858047) | [Whimseed Studio Private Limited](https://appshunter.io/developer/1668117901) |

## What reviewers say

### Zero/Sum

[App page](https://appshunter.io/ios/app/zerosum/id1200231665)

Solve mathematical puzzles to uncover a cure for cancer in this unique puzzle game. Experience an 80s action movie-inspired storyline with live-action cinematics and a variety of fresh puzzle mechanics. Features daily challenges and time trials.

**Highlights:** Unique and original puzzle gameplay, 80s action movie-inspired storyline, Full motion video cinematics with real actors, Variety of puzzle types (melting, number), Daily Challenge Mode with new puzzles, Time Trial mode

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Sum

[App page](https://appshunter.io/ios/app/sum-math-puzzle-brain-game/id6450458099)

This game challenges you to find sums from a grid of numbers before time runs out. It offers multiple modes, from fast-paced challenges to relaxed untimed play, and helps improve mental agility and logic skills.

**Highlights:** Timed addition challenges, Four distinct game modes, Offline play supported, Compete with friends, Detailed progress statistics, Sleek user interface

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $1.99 | per month |


## Frequently asked questions

### Is Zero/Sum free?

Zero/Sum is free to download, with no in-app purchases.

### Is Sum free?

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

### Which has better reviews, Zero/Sum or Sum?

Sum is rated higher. Zero/Sum averages 4.2 out of 5 from 27 ratings, while Sum averages 5.0 from 1 ratings.

### Do Zero/Sum or Sum have ads?

Sum shows ads; Zero/Sum does not.

### Which is updated more often, Zero/Sum or Sum?

Zero/Sum ships an update every 2 months, and Sum every 3 days. Most recently, Zero/Sum was updated on November 2, 2026 and Sum on November 3, 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.*