# NineGaps vs Rudoku

The clearest difference is rating: Rudoku at 4.7 against NineGaps's 4.0. Rudoku also leads on monetization model (free vs paid) and update cadence (every 3 weeks vs every 26 months). NineGaps's advantage is iOS requirement (10.3 vs 18.0). 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.

Rudoku holds the better App Store score, 4.7 against 4.0. Both are backed by a comparable volume of ratings — 10 and 19 respectively. Written reviews complicate that: 88% of NineGaps's written reviews are positive against 85% of Rudoku's, so the app with the better star average is not the one people write more warmly about.

NineGaps ships an update every 26 months, Rudoku every 3 weeks. Both last shipped on October 29, 2026.

## The numbers

| Metric | NineGaps | Rudoku |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (10 ratings)](https://appshunter.io/ios/app/ninegaps/id317223443/reviews) | **[4.7 (19 ratings)](https://appshunter.io/ios/app/rudoku/id965105321/reviews)** |
| Number of ratings | 10 | **19** |
| Positive reviews | **88.1% of reviews** | 84.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 26 months | **Every 3 weeks** |
| Monetization | Paid | **Free** |
| Size | 72 MB | 15 MB |
| Requires iOS | **10.3** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Quadion Technologies LLC](https://appshunter.io/developer/317223446) | [Cerebral Gardens](https://appshunter.io/developer/287980272) |

## What reviewers say

### NineGaps

[App page](https://appshunter.io/ios/app/ninegaps/id317223443)

This is a challenging puzzle game where you place numbers 1-9 into gaps, matching operations. It offers a unique twist on number puzzles with multiple difficulty levels and endless replayability.

**Highlights:** Unique puzzle gameplay, Cute graphics, 5 difficulty levels, Unlimited puzzles, Leaderboards and achievements, GameCenter integration

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🧠 Excellent brain training and mental math improvement
- 🎮 Simple yet challenging gameplay mechanics
- 🎨 Clean, polished, and attractive visual design
- ⏱️ Quick games perfect for short waiting periods
- 👨‍👩‍👧‍👦 Suitable for multiple age groups and skill levels

**What reviewers complain about**

- 🔊 Loud sound effects that cannot be controlled properly
- 💾 No game saving feature when closing app
- 🧮 Does not follow proper order of operations (PEMDAS)
- 🔴 Occasional crashes or app not opening
- 🎮 Limited replay value after extended play

**Reported bugs**

- Sound effects stop working intermittently
- App crashes or fails to open on launch
- Sound volume settings not saving between sessions
- OpenFeint achievements not awarding properly
- Mathematical calculation errors in some puzzles

**Requested features**

- Solution/reveal button to show answers when stuck
- Hint system for difficult puzzles
- Game auto-save functionality
- Persistent sound settings across sessions
- Global leaderboards for competition


### Rudoku

[App page](https://appshunter.io/ios/app/rudoku/id965105321)

This is a challenging number and logic puzzle game with multiple modes and difficulty levels. Track your progress with detailed stats and earn achievements. Enjoy endless playability with unique puzzles and accessibility features like dark mode.

**Highlights:** Multiple game modes, Adjustable difficulty levels, Variable board sizes, Detailed gameplay stats, Multiple achievements, Dark and light color modes, No in-app purchases

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

**In-app purchases:** none


## Frequently asked questions

### Is NineGaps free?

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

### Is Rudoku free?

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

### Which has better reviews, NineGaps or Rudoku?

Rudoku is rated higher. NineGaps averages 4.0 out of 5 from 10 ratings, while Rudoku averages 4.7 from 19 ratings.

### Do NineGaps or Rudoku have ads?

Neither NineGaps nor Rudoku shows ads.

### Which is updated more often, NineGaps or Rudoku?

NineGaps ships an update every 26 months, and Rudoku every 3 weeks. Most recently, NineGaps was updated on October 29, 2026 and Rudoku on October 29, 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.*