# Cyber Gems vs KnotNum

The clearest difference is in-app purchases: Cyber Gems at none against KnotNum's 4. Cyber Gems also leads on update cadence (every 3 days vs every 2 weeks) and iOS requirement (14.0 vs 18.0). KnotNum's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. KnotNum sells 4 one-off in-app purchases. Cyber Gems asks for nothing beyond the download.

Cyber Gems ships an update every 3 days, KnotNum every 2 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Cyber Gems | KnotNum |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 2 weeks |
| Size | 128 MB | 2 MB |
| Requires iOS | **14.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lidia Sherlock](https://appshunter.io/developer/1596256338) | [Pavel Gagarin](https://appshunter.io/developer/1535393148) |

## What reviewers say

### Cyber Gems

[App page](https://appshunter.io/ios/app/cyber-gems/id6443392228)

**In-app purchases:** none


### KnotNum

[App page](https://appshunter.io/ios/app/knotnum-number-chains/id6786274224)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 200 Coins | $0.99 | one-time |
| Premium | $0.99 | one-time |
| 700 Coins | $2.99 | one-time |
| 1800 Coins | $5.99 | one-time |


## Frequently asked questions

### Is Cyber Gems free?

Cyber Gems is free to download, with no in-app purchases.

### Is KnotNum free?

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

### Do Cyber Gems or KnotNum have ads?

Cyber Gems shows ads; KnotNum does not.

### Which is updated more often, Cyber Gems or KnotNum?

Cyber Gems ships an update every 3 days, and KnotNum every 2 weeks. Most recently, Cyber Gems was updated on November 3, 2026 and KnotNum on October 31, 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.*