# Number Sum Puzzle vs KnotNum

The clearest difference is ads: KnotNum at none against Number Sum Puzzle's shown. Number Sum Puzzle's advantage is update cadence (every 5 days vs every 2 weeks) and iOS requirement (15.1 vs 18.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Number Sum Puzzle sells 5 one-off in-app purchases and KnotNum sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Number Sum Puzzle ships an update every 5 days, KnotNum every 2 weeks. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Number Sum Puzzle | KnotNum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (6 ratings)](https://appshunter.io/ios/app/number-sum-puzzle-math-game/id6759648322/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 5 days** | Every 2 weeks |
| Monetization | Ad-supported | — |
| Size | 138 MB | 2 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [LIHUHU PUBLISHING PTE. LTD.](https://appshunter.io/developer/1732214108) | [Pavel Gagarin](https://appshunter.io/developer/1535393148) |

## What reviewers say

### Number Sum Puzzle

[App page](https://appshunter.io/ios/app/number-sum-puzzle-math-game/id6759648322)

This logic puzzle game challenges your brain with number sums. Arrange numbers in a grid so rows and columns match target sums. Enjoy handcrafted puzzles with no timers or pressure, perfect for a calm, focused mental workout.

**Highlights:** Number sum grid puzzles, Handcrafted unique solutions, No timers or pressure, Offline play, Daily brain workout, Dark mode support

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Starter Hints | $1.99 | one-time |
| Value Hints | $5.99 | one-time |
| Mega Hints | $9.99 | one-time |
| VIP - No Ads | $19.99 | one-time |
| VIP - No Ads | $49.99 | one-time |


### 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 Number Sum Puzzle free?

Number Sum Puzzle is free to download, with in-app purchases available.

### Is KnotNum free?

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

### Do Number Sum Puzzle or KnotNum have ads?

Number Sum Puzzle shows ads; KnotNum does not.

### Which is updated more often, Number Sum Puzzle or KnotNum?

Number Sum Puzzle ships an update every 5 days, and KnotNum every 2 weeks. Most recently, Number Sum Puzzle was updated on November 5, 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.*