# Nuts & Bolts vs Entropy

The clearest difference is ads: Entropy at none against Nuts & Bolts's shown. Entropy also leads on update cadence (every 2 weeks vs every 3 months). Nuts & Bolts's advantage is iOS requirement (12.0 vs 18.6). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Nuts & Bolts sells 2 in-app purchases, starting at $4.99 per 7 days and Entropy sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Nuts & Bolts ships an update every 3 months, Entropy every 2 weeks. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Nuts & Bolts | Entropy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Size | 239 MB | 6 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Atta Mohi Ud Din](https://appshunter.io/developer/1653234972) | [Erdener Uyan](https://appshunter.io/developer/1843571074) |

## What reviewers say

### Nuts & Bolts

[App page](https://appshunter.io/ios/app/nuts-and-bolts-3d-screw-puzzle/id6503043220)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| remove ad weekly | $4.99 | per 7 days |
| remove ad monthly | $9.99 | per month |


### Entropy

[App page](https://appshunter.io/ios/app/entropy-zero/id6757635585)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Emergency Kit | $0.99 | one-time |
| Hacker Bundle | $2.99 | one-time |
| Developer Access | $4.99 | one-time |
| Survival Mode | $9.99 | one-time |


## Frequently asked questions

### Is Nuts & Bolts free?

Nuts & Bolts is free to download, with in-app purchases available.

### Is Entropy free?

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

### Do Nuts & Bolts or Entropy have ads?

Nuts & Bolts shows ads; Entropy does not.

### Which is updated more often, Nuts & Bolts or Entropy?

Nuts & Bolts ships an update every 3 months, and Entropy every 2 weeks. Most recently, Nuts & Bolts was updated on November 8, 2026 and Entropy on November 5, 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.*