# Zero? vs Knight Tour Trainer

The clearest difference is iOS requirement: Zero? at 8.0 against Knight Tour Trainer's 14.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on October 24, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Zero? | Knight Tour Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (3 ratings)](https://appshunter.io/ios/app/zero/id1025506040/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | — |
| Size | 27 MB | 76 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Greg Sharpe](https://appshunter.io/developer/817544895) | [Vitalii Medvediev](https://appshunter.io/developer/1856678748) |

## What reviewers say

### Zero?

[App page](https://appshunter.io/ios/app/zero/id1025506040)

A fast-paced number game where players must quickly determine if sums of numbers are multiples of ten. Offers various modes for solo play or head-to-head challenges with friends.

**Highlights:** Sum calculation challenges, Timed gameplay, Relaxed mode without time pressure, Two-player head-to-head mode, Multiplayer on a single device

**Features:** macOS Compatibility

**In-app purchases:** none


### Knight Tour Trainer

[App page](https://appshunter.io/ios/app/knight-tour-trainer/id6755841046)

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

**In-app purchases:** none


## Frequently asked questions

### Is Zero? free?

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

### Is Knight Tour Trainer free?

Knight Tour Trainer is free to download, with no in-app purchases.

### Do Zero? or Knight Tour Trainer have ads?

Neither Zero? nor Knight Tour Trainer shows ads.

### Which is updated more often, Zero? or Knight Tour Trainer?

Zero? ships an update every 3 months, and Knight Tour Trainer every 3 months. Most recently, Zero? was updated on October 24, 2026 and Knight Tour Trainer on October 7, 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.*