# Zero/Sum vs Perfect Sum

The clearest difference is review sentiment: Perfect Sum at 100% against Zero/Sum's 54%. Perfect Sum also leads on rating (5.0 vs 4.2) and update cadence (every 3 days vs every 2 months). Zero/Sum's advantage is ads (none vs shown) and ratings volume (27 vs 2). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Perfect 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 2, so its average is the more settled of the two. Written reviews point the same way: 54% of Zero/Sum's written reviews are positive against 100% of Perfect Sum's.

Zero/Sum ships an update every 2 months, Perfect Sum every 3 days. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Zero/Sum | Perfect Sum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (27 ratings)](https://appshunter.io/ios/app/zerosum/id1200231665/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/perfect-sum/id6477300117/reviews)** |
| Number of ratings | **27** | 2 |
| Positive reviews | 53.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | **Free** | Ad-supported |
| Size | 973 MB | 139 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Sean Kearney](https://appshunter.io/developer/944858047) | [Benjamin Richy](https://appshunter.io/developer/1636888789) |

## 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


### Perfect Sum

[App page](https://appshunter.io/ios/app/perfect-sum/id6477300117)

A captivating puzzle game where you strategically place shapes on a numbered board to reach a perfect sum. Unlock new buildings and enjoy stunning visuals and rewarding animations as you progress through increasingly challenging levels.

**Highlights:** Strategic shape placement, Numbered board puzzles, Unlockable buildings, Increasing difficulty levels, Rewarding animations, Stunning visuals

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Zero/Sum free?

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

### Is Perfect Sum free?

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

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

Perfect Sum is rated higher. Zero/Sum averages 4.2 out of 5 from 27 ratings, while Perfect Sum averages 5.0 from 2 ratings.

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

Perfect Sum shows ads; Zero/Sum does not.

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

Zero/Sum ships an update every 2 months, and Perfect Sum every 3 days. Most recently, Zero/Sum was updated on November 2, 2026 and Perfect Sum on November 4, 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.*