# Euclidea vs Nonograms Katana

The clearest difference is ratings volume: Nonograms Katana at 6.8K against Euclidea's 938. Euclidea's advantage is iOS requirement (8.0 vs 15.0). On price, rating, review sentiment and update cadence there is nothing between them.

Both are free to download. Euclidea sells 6 one-off in-app purchases and Nonograms Katana sells 8 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for Euclidea against 4.8 for Nonograms Katana. That said, the two scores are not equally well evidenced: Nonograms Katana has 6.8K ratings behind it against 938, so its average is the more settled of the two. Written reviews are what separate them: 86% of Euclidea's written reviews are positive against 83% of Nonograms Katana's.

Euclidea ships an update every 3 months, Nonograms Katana every 4 months. Both last shipped on November 6, 2026.

## The numbers

| Metric | Euclidea | Nonograms Katana |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (938 ratings)](https://appshunter.io/ios/app/euclidea/id927914361/reviews)** | [4.8 (6.8K ratings)](https://appshunter.io/ios/app/nonograms-katana/id1037710023/reviews) |
| Number of ratings | 938 | **6.8K** |
| Positive reviews | **86.1% of reviews** | 82.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 223 MB | 42 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [HORIS INTERNATIONAL LIMITED](https://appshunter.io/developer/646324304) | [Ucdevs Interaction DOO](https://appshunter.io/developer/1037710022) |

## What reviewers say

### Euclidea

[App page](https://appshunter.io/ios/app/euclidea/id927914361)

Engage in geometric construction puzzles based on Euclidean principles. Solve increasingly difficult challenges using innovative tools, with options to explore, get hints, and compete with friends. Unlock new levels by earning stars or purchase an in-app item to remove restrictions.

**Highlights:** 156 geometric puzzle levels, 10 innovative construction tools, Explore mode with hints, Dynamic drag, zoom, and pan interface, Game Center competition, Unlockable tools and shortcuts

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock the Rest Levels | $0.99 | one-time |
| Unlock the Rest Hints | $0.99 | one-time |
| Thanks to developers | $0.99 | one-time |
| Night Mode | $0.99 | one-time |
| Many thanks to developers | $4.99 | one-time |
| Many, many thanks to developers | $49.99 | one-time |

**What reviewers like**

- 🚀 Excellent interface
- 🚀 Smooth controls
- 👍 Challenging and engaging puzzles
- 👍 Helps learn and improve geometry skills
- 👍 No ads or in-app purchases

**What reviewers complain about**

- 🐛 App crashes on launch for some users
- 🐛 Circle tool not snapping to points properly
- 🐛 Solutions not always accepted even when correct
- 🔒 Locked levels require in-app purchases to access

**Reported bugs**

- App crashing on launch
- Circle tool not snapping to points
- Solutions not being accepted correctly

**Requested features**

- Offline mode support
- Ability to mark points on free draw
- Protractor feature
- More supplemental educational content
- Ability to see when multiple solutions exist


### Nonograms Katana

[App page](https://appshunter.io/ios/app/nonograms-katana/id1037710023)

This logic puzzle game challenges you to fill in cells based on numerical clues to reveal hidden pictures. It offers a vast collection of puzzles, creation tools, and engaging expansions for a mentally stimulating experience.

**Highlights:** 1001 nonograms included, Create and share your own puzzles, Black-and-white and colored puzzles, Puzzles sorted by size, Optional RPG expansion, Cloud save and achievements

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 80 Hints | $0.99 | one-time |
| Rubies (5) | $0.99 | one-time |
| Potion of healing lvl. 2 (15) | $0.99 | one-time |
| Potion "Ambrosia" (7) | $0.99 | one-time |
| 200 Hints | $1.99 | one-time |
| Rubies (15) | $1.99 | one-time |
| Rubies (50) | $5.99 | one-time |
| VIP version | $5.99 | one-time |

**What reviewers like**

- 👍 Lots of puzzles
- 👍 Customizable settings
- 👍 Minimal ads
- 👍 Challenging puzzles
- 👍 User-created puzzles

**What reviewers complain about**

- 🐛 Occasional crashes
- 🐛 Puzzle progress loss
- 🐛 Ads not working
- 🐛 Freezing issues
- 🐛 Compatibility problems

**Reported bugs**

- Puzzle progress not saving
- Puzzle images not loading
- Freezing/crashing on larger puzzles
- Ads not playing properly
- Compatibility issues with newer iOS versions

**Requested features**

- Dark mode option
- Ability to rearrange/move puzzle pieces
- Difficulty ratings for puzzles
- Automatic line/row completion
- Ability to follow/subscribe to users


## Frequently asked questions

### Is Euclidea free?

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

### Is Nonograms Katana free?

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

### Which has better reviews, Euclidea or Nonograms Katana?

Euclidea is rated higher. Euclidea averages 4.8 out of 5 from 938 ratings, while Nonograms Katana averages 4.8 from 6.8K ratings.

### Do Euclidea or Nonograms Katana have ads?

Neither Euclidea nor Nonograms Katana shows ads.

### Which is updated more often, Euclidea or Nonograms Katana?

Euclidea ships an update every 3 months, and Nonograms Katana every 4 months. Most recently, Euclidea was updated on November 6, 2026 and Nonograms Katana on November 6, 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.*