# Kurotto vs Index Sums

The clearest difference is rating: Index Sums at 5.0 against Kurotto's 4.7. Kurotto's advantage is iOS requirement (7.0 vs 17.6). On price, review sentiment, ratings volume and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Index Sums holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 3 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

## The numbers

| Metric | Kurotto | Index Sums |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (3 ratings)](https://appshunter.io/ios/app/kurotto/id1141647313/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/index-sums/id6745894447/reviews)** |
| Number of ratings | 3 | **4** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 3 weeks |
| Monetization | Free | Free |
| Size | 14 MB | 25 MB |
| Requires iOS | **7.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yuki Fujimoto](https://appshunter.io/developer/467085185) | [ZORIX LLC](https://appshunter.io/developer/1814371874) |

## What reviewers say

### Kurotto

[App page](https://appshunter.io/ios/app/kurotto/id1141647313)

A logic puzzle game where you fill cells based on rules involving continuous black cells and circles. It's a popular brain teaser originating from Japan, offering a unique challenge for puzzle enthusiasts.

**Highlights:** Binary determination puzzle, Circle sum logic, Continuous black cell counting, Vertical and horizontal rules, Unique Japanese puzzle mechanics

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 Kurotto free?

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

### Is Index Sums free?

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

### Which has better reviews, Kurotto or Index Sums?

Index Sums is rated higher. Kurotto averages 4.7 out of 5 from 3 ratings, while Index Sums averages 5.0 from 4 ratings.

### Do Kurotto or Index Sums have ads?

Neither Kurotto nor Index Sums shows ads.

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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.*