# Zero/Sum vs Métropolitain

The clearest difference is price: Zero/Sum at Free against Métropolitain's $0.99. Zero/Sum also leads on iOS requirement (8.0 vs 13.0). Métropolitain's advantage is update cadence (daily vs every 2 months). On review sentiment, ads, in-app purchases and device support there is nothing between them.

Zero/Sum is free to download; Métropolitain costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Zero/Sum ships an update every 2 months, Métropolitain daily. Both last shipped on November 2, 2026.

## The numbers

| Metric | Zero/Sum | Métropolitain |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.2 (27 ratings)](https://appshunter.io/ios/app/zerosum/id1200231665/reviews)** | — |
| Number of ratings | **27** | — |
| Positive reviews | **53.8% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Monetization | **Free** | Paid |
| Size | 973 MB | 48 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Sean Kearney](https://appshunter.io/developer/944858047) | [Jeroen Keij](https://appshunter.io/developer/382999798) |

## 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


### Métropolitain

[App page](https://appshunter.io/ios/app/metropolitain/id6468594007)

Guide travelers through the Paris metro in 1924. Help passengers catch the correct train on time by providing directions. Explore historically accurate stations and unlock fascinating details about their origins.

**Highlights:** Guide passengers to correct trains, 25 historically modeled levels, Uniquely generated levels, Unlock historical station details, Challenging time-based gameplay

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

**In-app purchases:** none


## Frequently asked questions

### Is Zero/Sum free?

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

### Is Métropolitain free?

Métropolitain costs $0.99, with no in-app purchases.

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

Neither Zero/Sum nor Métropolitain shows ads.

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

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