Comparison

SmartGo One vs Catch The Rule

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

Head to head
About

SmartGo One

Learn, play, and improve at the ancient game of Go. This app offers adjustable board sizes, a strong AI opponent, and tools to study professional games and solve Go problems. It's designed for players of all skill levels, from beginners to masters.

Highlights
  • Adjustable board sizes (9x9 to 19x19)
  • Strong KataGo game engine
  • Study professional game records
  • Solve Go problems and tutorials
  • Pattern matching for move suggestions
  • Territory estimator
  • Game recording and annotation
Features
Read full description

SmartGo One is the only Go app you’ll need, whether you’re just getting started or already a seasoned player. Learn, play, study, and improve with SmartGo One. Experience the ancient game of Go on your iPhone, iPad, or Mac in a whole new way. Also known as igo (囲碁), wéiqí (围棋), or baduk (바둑), Go begins with an empty board that gradually fills as players surround territory and capture stones. Start with a 9x9 board and move up to 13x13 and 19x19 as your skills grow. SmartGo One adapts to your strength, automatically adjusting handicaps so games remain competitive and enjoyable. And when you’re ready for a serious challenge, the powerful KataGo-based engine delivers strong, rewarding play. But SmartGo One is far more than a way to play Go. Read interactive Go books while replaying the moves they describe to deepen your understanding. Explore a collection of more than 138,000 professional game records spanning both modern and historical masters. Improve your reading and decision-making skills with a growing library of Go problems and tutorials. Want to know how a master would handle a position on your board? SmartGo’s pattern matching technology compares your game with historical pro games and shows how strong players approached similar situations. No matter your level, SmartGo One helps you continue improving. Features include: • 9x9, 11x11, 13x13, and 19x19 board sizes • Powerful KataGo-based engine • Fast and responsive gameplay • Manual or automatic handicap adjustment • Record, annotate, and edit your games • Territory estimator • Hints and move analysis • Undo and replay controls • Tutorial with over 100 problems • Extensive user manual We value your privacy and only collect the minimum information necessary to make our apps work well for you. Learn more at https://smartgo.com/privacy.html. This app is licensed under Apple’s standard Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Catch The Rule

Features
Read full description

Catch the Rule is a brain puzzle game where you find the hidden pattern in numbers, letters, and shapes, then fill in the missing answer. Start with simple patterns and move through multiplication, squares, math sequences, letter rules, and shape puzzles. Use hints when you get stuck, clear stages one by one, and challenge the 60-second Time Attack mode to climb the ranking. Features: - Stage-based campaign puzzles - Number, letter, and shape pattern challenges - Hints for tough moments - 60-second Time Attack and rankings - Lightweight single-player play with no login required Play a quick round or clear a full chapter. The fun begins when the rule finally clicks.

Screenshots

SmartGo One4 screens
Catch The Rule4 screens

Verdict

The call

The clearest difference is ads: SmartGo One at none against Catch The Rule's shown. SmartGo One also leads on device support (3 vs 1). Catch The Rule's advantage is update cadence (every 5 days vs every 10 days) and iOS requirement (17.0 vs 26.0). On price and in-app purchases 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. SmartGo One sells 47 in-app purchases, starting at $4.99 per month and Catch The Rule sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

SmartGo One ships an update every 10 days, Catch The Rule every 5 days. The most recent releases landed on October 19, 2026 and October 14, 2026 respectively.

Scorecard4 real differences · 6 level
SmartGo One versus Catch The Rule: the parameters behind the verdict, then further details
ParameterSmartGo OneCatch The Rule
PriceFreeFree
Rating4.8 (2K ratings) — better—
Positive reviews76.6% of reviews—
Number of ratings2K — better—
Update frequencyEvery 10 daysEvery 5 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Mac — betteriPhone
Requires iOS26.017.0 — better
Further details — not scored
Size154 MB8 MB
Age rating4+4+
DeveloperSmart Go, Inc.Mijin Kim

Bugs and requests

SmartGo One

Reported bugs

3 issues
  • Illegal move detection issues on certain board positions
  • Problems with missing variations or incorrect answers
  • Inconsistent behavior when passing moves

Requested features

5 requests
  • Add read-only mode
  • Improve move suggestion explanations
  • Introduce difficulty settings for AI
  • Integrate online play functionality
  • Provide more randomness in AI moves

Catch The Rule

Not enough reviews yet to summarise bugs or requests.

In-app purchases

47 purchases

SmartGo One

Subscriptions2
  • SmartGo One Pro – Monthly$4.991 Month
  • Pro Games and Features14 Days trial$29.991 Year
One-time45
  • Just Enough Japanese 1Free
  • Key Concepts in Life and Death$2.99
  • Go Problems Master Collection$3.99
Show 42 more
  • Go Problems Add-on 2: Medium$3.99
  • Go Problems Add-on 1: Easy$3.99
  • Go Problems Add-on 3: Hard$3.99
  • Counting Liberties$4.99
  • The Monkey Jump$4.99
  • Double Digit Kyu Games$5.99
  • Go: A Complete Introduction$5.99
  • How Not to Play Go$5.99
  • Encyclopedia of Go Principles$5.99
  • Want to Play Go? Level 1$5.99
  • Black to Play 30-25 Kyu$5.99
  • The Workshop Lectures 1$5.99
  • Rethinking Opening Strategy$6.99
  • Learn to Play Go 1$7.99
  • Learn to Play Go 2$7.99
  • Learn to Play Go 3$7.99
  • Correct Joseki$7.99
  • “The Theory of Go”$7.99
  • Learn to Play Go 4$7.99
  • Buddhist Philosophy Game of Go$8.99
  • Graded Go Problems 1$9.99
  • Graded Go Problems 2$9.99
  • Want to Play Go? Level 2$9.99
  • Basic Techniques of Go$9.99
  • Graded Go Problems 3$9.99
  • Get Strong at Life and Death$9.99
  • Mastering Mini Go by Mark Tomlinson$11.99
  • Fuseki Revolution$11.99
  • Fundamental Principles of Go$11.99
  • The Basics of Life and Death$11.99
  • Joseki Revolution$11.99
  • Life and Death$11.99
  • A Survey of the Basic Tesujis$11.99
  • Tesuji$11.99
  • Tesuji for Beginners$14.99
  • AlphaGo to Zero, vol. 4$14.99
  • Trouble Master, volume 2$14.99
  • Trouble Master, volume 1$14.99
  • AlphaGo to Zero, Vol. 2$14.99
  • Invincible$24.99
  • Essential Go Proverbs$24.99
  • Pro – Lifetime Unlock$99.00
5 purchases

Catch The Rule

One-time5
  • 5 Hints$1.99
  • 10 Hints$2.99
  • Remove Ads$3.99
Show 2 more
  • 20 Hints$4.99
  • 50 Hints$7.99

Questions

Is SmartGo One free?
SmartGo One is free to download, with in-app purchases available.
Is Catch The Rule free?
Catch The Rule is free to download, with in-app purchases available.
Do SmartGo One or Catch The Rule have ads?
Catch The Rule shows ads; SmartGo One does not.
Which is updated more often, SmartGo One or Catch The Rule?
SmartGo One ships an update every 10 days, and Catch The Rule every 5 days. Most recently, SmartGo One was updated on October 19, 2026 and Catch The Rule on October 14, 2026.

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