# Rudoku vs cardinal.

The clearest difference is update cadence: cardinal. at every 3 days against Rudoku's every 3 weeks. cardinal. also leads on iOS requirement (11.0 vs 18.0). On price, rating, review sentiment and ratings volume there is nothing between them.

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

cardinal. holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 19 and 14 respectively. Written reviews complicate that: 85% of Rudoku's written reviews are positive against 80% of cardinal.'s, so the app with the better star average is not the one people write more warmly about.

Rudoku ships an update every 3 weeks, cardinal. every 3 days. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Rudoku | cardinal. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (19 ratings)](https://appshunter.io/ios/app/rudoku/id965105321/reviews) | **[4.9 (14 ratings)](https://appshunter.io/ios/app/cardinal/id1589334930/reviews)** |
| Number of ratings | **19** | 14 |
| Positive reviews | **84.6% of reviews** | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 3 days** |
| Monetization | Free | Free |
| Size | 15 MB | 99 MB |
| Requires iOS | 18.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Cerebral Gardens](https://appshunter.io/developer/287980272) | [Perfect Hat Games LLC](https://appshunter.io/developer/1124547329) |

## What reviewers say

### 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


### cardinal.

[App page](https://appshunter.io/ios/app/cardinal/id1589334930)

Engage in a minimalistic logic puzzle game where you deduce a secret solution using sixteen cards and clues. Enjoy procedurally generated boards for endless play and compete globally in daily challenges.

**Highlights:** Minimalistic logic puzzles, Deduce secret solutions, Procedurally generated boards, Endless regular mode, Daily global competitions, 16 logic cards

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

**In-app purchases:** none


## Frequently asked questions

### Is Rudoku free?

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

### Is cardinal. free?

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

### Which has better reviews, Rudoku or cardinal.?

cardinal. is rated higher. Rudoku averages 4.7 out of 5 from 19 ratings, while cardinal. averages 4.9 from 14 ratings.

### Do Rudoku or cardinal. have ads?

Neither Rudoku nor cardinal. shows ads.

### Which is updated more often, Rudoku or cardinal.?

Rudoku ships an update every 3 weeks, and cardinal. every 3 days. Most recently, Rudoku was updated on October 22, 2026 and cardinal. on October 24, 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.*