# Number Sum Up vs Index Sums

The clearest difference is in-app purchases: Index Sums at none against Number Sum Up's 1. Index Sums also leads on rating (5.0 vs 4.6). Number Sum Up's advantage is update cadence (every 3 days vs every 3 weeks) and ratings volume (19 vs 3). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Number Sum Up sells 1 one-off in-app purchase. Index Sums asks for nothing beyond the download.

Index Sums holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Number Sum Up has 19 ratings behind it against 3, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Number Sum Up ships an update every 3 days, Index Sums every 3 weeks. The most recent releases landed on October 13, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Number Sum Up | Index Sums |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (19 ratings)](https://appshunter.io/ios/app/number-sum-up-quick-math/id6502631525/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/index-sums/id6745894447/reviews)** |
| Number of ratings | **19** | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 197 MB | 25 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ALICE GAMES](https://appshunter.io/developer/1726187276) | [ZORIX LLC](https://appshunter.io/developer/1814371874) |

## What reviewers say

### Number Sum Up

[App page](https://appshunter.io/ios/app/number-sum-up-quick-math/id6502631525)

Solve number puzzles by circling and erasing digits to make rows and columns add up to target sums. This game offers a clean design and varying difficulty levels to sharpen your mental math skills.

**Highlights:** Circle and erase numbers, Solve row and column sum puzzles, Multiple difficulty levels, Varying board sizes, Hint system, Clean and simple design

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


### Index Sums

[App page](https://appshunter.io/ios/app/index-sums/id6745894447)

Engage your mind with a Japanese number logic puzzle. Fill grids based on row and column sums, using pure logic to reveal hidden patterns. Offers multiple difficulty levels and daily challenges for continuous mental stimulation.

**Highlights:** Row and column sum logic puzzles, Multiple difficulty levels, Daily challenges, Progress tracking and statistics, Offline play, Customizable themes, Haptic feedback

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Number Sum Up free?

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

### Is Index Sums free?

Index Sums is free to download, with no in-app purchases.

### Which has better reviews, Number Sum Up or Index Sums?

Index Sums is rated higher. Number Sum Up averages 4.6 out of 5 from 19 ratings, while Index Sums averages 5.0 from 3 ratings.

### Do Number Sum Up or Index Sums have ads?

Neither Number Sum Up nor Index Sums shows ads.

### Which is updated more often, Number Sum Up or Index Sums?

Number Sum Up ships an update every 3 days, and Index Sums every 3 weeks. Most recently, Number Sum Up was updated on October 13, 2026 and Index Sums on October 9, 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.*