Comparison

Rudoku vs cardinal.

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Rudoku

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
Read full description

Rudoku is an expert level puzzle challenge for fans of numbers and logic games. Multiple game modes, difficulty levels, and board sizes will keep your brain stimulated as you decipher the solutions to each puzzle. Maintaining high gameplay stats and earning multiple achievements will make Rudoku your go-to brain teaser. Take your time and see how long it takes you in Relaxed Mode. Speed and accuracy come into play in Race Mode when your goal is to solve the puzzle before time runs out. Endless Mode makes each game board increasingly difficult to solve. KEY FEATURES • Endless Playability - Puzzles will never repeat while multiple game modes, difficulty levels, and board sizes keep the challenge fresh and your brain sharp. • Game Play Stats - In game stats will let you know the duration of each game, how many moves you made, your win percentage, and more. • Dark and Light Colour Modes - This great accessibility feature makes the screen easier on your eyes in the dark. • Multiple Achievements - Earn awards and Game Centre points a number of different ways including level achievements and stats challenges. • No In-App Purchases - Pay once and play. No need to waste time on ads or pesky in-app purchasing gimmicks.

About

cardinal.

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
Read full description

Minimalistic yet challenging, CARDINAL gives you sixteen different cards and clues in which you must figure out the secret solution! Begin with the cardinal rule you can then continue to creatively deduce the solution from there! An endless amount of procedurally generated boards waits for you in regular mode. And when you feel ready, test yourself in the daily competition alongside players from all over the globe.

Screenshots

Rudoku4 screens
cardinal.3 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 8 level
Rudoku versus cardinal.: the parameters behind the verdict, then further details
ParameterRudokucardinal.
PriceFreeFree
Rating4.7 (19 ratings)4.9 (14 ratings) — better
Positive reviews84.6% of reviews — better80.0% of reviews
Number of ratings19 — better14
Update frequencyEvery 3 weeksEvery 3 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.011.0 — better
Further details — not scored
Size15 MB99 MB
Age rating4+4+
DeveloperCerebral GardensPerfect Hat Games LLC

Customer experience

Rudoku

All ratings19 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews13 reviews
Positive84.6%
Neutral0.0%
Negative15.4%

cardinal.

All ratings14 ratings
Positive92.9%
Neutral7.1%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral20.0%
Negative0.0%

In-app purchases

None

Rudoku

No in-app purchases

None

cardinal.

No in-app purchases

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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