# NumChain vs Odd Machines

The clearest difference is review sentiment: NumChain at 100% against Odd Machines's 61%. NumChain also leads on update cadence (monthly vs every 2 months). Odd Machines's advantage is ads (none vs shown) and iOS requirement (15.0 vs 18.0). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. NumChain sells 5 one-off in-app purchases and Odd Machines sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

NumChain ships an update monthly, Odd Machines every 2 months. Both last shipped on November 4, 2026.

## The numbers

| Metric | NumChain | Odd Machines |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (89 ratings)](https://appshunter.io/ios/app/odd-machines-mechanical-boxes/id6737251986/reviews)** |
| Number of ratings | — | **89** |
| Positive reviews | **100.0% of reviews** | 61.1% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 14 MB | 436 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [J.Benito Pereira](https://appshunter.io/developer/1267263346) | [XSGames](https://appshunter.io/developer/1725979641) |

## What reviewers say

### NumChain

[App page](https://appshunter.io/ios/app/numchain-math-number-puzzle/id6670266485)

This number puzzle game sharpens mental math skills through engaging gameplay. Connect numbers to form chains, sums, and products across three distinct modes. Compete globally, earn achievements, and enjoy a clean, intuitive interface designed for all ages.

**Highlights:** Three game modes: Chains, Sums, Multiplication, Global leaderboards and achievements, Hint system for challenging puzzles, Intuitive interface and clean design, Optimized for iPhone and iPad, Develops mental calculation and strategic thinking

**Features:** macOS Compatibility, Family Sharing, Vision Pro support, iPhone Duo support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 25 Points | $0.99 | one-time |
| 53 Points | $1.99 | one-time |
| Ads Remove | $2.99 | one-time |
| 85 Points | $2.99 | one-time |
| 110 Points | $3.99 | one-time |


### Odd Machines

[App page](https://appshunter.io/ios/app/odd-machines-mechanical-boxes/id6737251986)

Embark on a 3D escape room adventure as a treasure hunter seeking a lost artifact. Solve intricate mechanical puzzles, uncover hidden objects, and unravel mysteries within an ancient temple. Collect fragments of a powerful stone to escape.

**Highlights:** Solve unique puzzle boxes, Explore an ancient temple, Collect fragments of a lost stone, Immersive audio experience, Multi-language support

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Game | $3.99 | one-time |
| Unlock Full Game + Coffee | $4.99 | one-time |
| Unlock Full Game + Love | $7.99 | one-time |

**What reviewers like**

- 🤔 Makes you think
- 💡 Ingenious puzzles
- ✨ Beautiful graphics
- 🎶 Soothing sounds and music
- 🎯 Logical puzzles

**What reviewers complain about**

- 🤏 Tiny text size
- 🖱️ Frustrating click accuracy
- ❓ Clues sometimes random
- 💰 Overpriced for content
- 🚫 Game doesn't work

**Reported bugs**

- No stone to collect from 5th window
- Game closes immediately on 'play'
- Bug in first machine, stone disappears
- Cannot zoom on puzzle
- Cannot actuate dials

**Requested features**

- Full game should be free
- Monocle usable at zoomed out level
- More visual feedback for puzzle completion
- Option to get the answer when hint isn't enough
- More levels/unlimited levels


## Frequently asked questions

### Is NumChain free?

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

### Is Odd Machines free?

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

### Do NumChain or Odd Machines have ads?

NumChain shows ads; Odd Machines does not.

### Which is updated more often, NumChain or Odd Machines?

NumChain ships an update monthly, and Odd Machines every 2 months. Most recently, NumChain was updated on November 4, 2026 and Odd Machines 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.*