Comparison

Sumaddle vs Clashdoku

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

Head to head
About

Sumaddle

This logic puzzle game transforms pencil-and-paper challenges into interactive brain teasers. Fit number combinations to clues using pure logic, with no mental arithmetic required. Enjoy over 150 free puzzles of varying difficulty, with built-in help and offline play.

Highlights
  • Interactive logic puzzles
  • Number combination fitting
  • Pure logic solving
  • Built-in help and mistake correction
  • Over 150 free puzzles
  • Offline play
  • Ad-free experience
Features
Read full description

• “Brilliant puzzle game”, UK App Store review Apr 2025 • “Best Puzzle Game I’ve Ever Played”, US App Store review Jan 2025 • “The ONLY iOS game I've never gotten tired of”, Reddit review Apr 2024 This type of logical puzzle was first seen in the Japan Puzzle Championship 2006 and is sometimes known as Doppelblock, or Smashed Sums. When played with pencil and paper, these puzzles can be hard work to solve. Sumaddle changes that by adding the essential element of interaction. This transforms the puzzles into intriguing brain teasers that unfold before your eyes. Each puzzle has a unique solution. Finding the solution involves fitting the number combinations to the clues. The app makes it easy to view the possible combinations, you don’t need to do any sums in your head. Instead, you can focus on using logic to narrow down the combinations and find a fitting arrangement. Some reasons why you will enjoy playing Sumaddle: • puzzles range in size and difficulty from small and simple to large and mind-blowing • more than 150 puzzles are included for free • all puzzles can be solved with pure logic, no mental arithmetic required • the sophisticated built-in help can explain the logical reasoning at each step and also fix mistakes if you go wrong • the built-in help is completely free, use it as much as you like • works offline (great for long journeys) • a high standard of accessibility, including comprehensive support for VoiceOver • ad-free play - there are absolutely no ads! IGRS age rating (Indonesia Game Rating System): 3+ Designed and developed in Winterthur, Switzerland

About

Clashdoku

Read full description

Clashdoku is a Sudoku game with solo play and real-time multiplayer. Solve Easy, Medium, or Hard puzzles. Your progress is saved so you can resume unfinished games. Challenge another player in a Game Center Battle, each one solves the same puzzle on their own. Five consecutive correct entries charge a Send Bomb attack, which removes one opponent entry on their board. Choose Quick Battle or invite a Game Center friend. A one-time purchase unlocks all premium puzzle books, themes, matching app icons, and a Pet Cat Companion. Battle requires an internet connection and Game Center sign-in. Solo, Dailies and Books play work offline.

Screenshots

Sumaddle3 screens
Clashdoku4 screens

Verdict

The call

The clearest difference is iOS requirement: Sumaddle at 16.0 against Clashdoku's 26.0. On price, ads, in-app purchases and device support 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. Sumaddle sells 15 one-off in-app purchases and Clashdoku sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Scorecard1 real difference · 9 level
Sumaddle versus Clashdoku: the parameters behind the verdict, then further details
ParameterSumaddleClashdoku
PriceFreeFree
Rating4.9 (767 ratings) — better—
Positive reviews94.9% of reviews—
Number of ratings767 — better—
Update frequencyEvery 3 weeks—
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad — betteriPhone
Requires iOS16.0 — better26.0
Further details — not scored
Size30 MB10 MB
Age rating4+4+
DeveloperJonathan BuchananFranco Garza

Bugs and requests

Sumaddle

Reported bugs

2 issues
  • Losing progress when minimizing the app
  • Inconsistent difficulty ratings

Requested features

4 requests
  • Ability to selectively pencil in notes
  • More difficult puzzle options
  • Synced progress across devices
  • Detailed statistics and leaderboard

Clashdoku

Not enough reviews yet to summarise bugs or requests.

In-app purchases

15 purchases

Sumaddle

One-time15
  • Quirky, Pack 5$0.99
  • Very Difficult Puzzles$0.99
  • Quirky, Pack 1$0.99
Show 12 more
  • Premium 9x9 Puzzles, Pack 1$0.99
  • Crafty, Pack 1$0.99
  • Crafty, Pack 2$0.99
  • Crafty, Pack 3$0.99
  • Sneaky, Pack 1$0.99
  • Sneaky, Pack 2$0.99
  • Sneaky, Pack 3$0.99
  • Tricky, Pack 1$0.99
  • Tricky, Pack 2$0.99
  • Tricky, Pack 3$0.99
  • Assorted Puzzles$0.99
  • Puzzle Generator$9.99
1 purchases

Clashdoku

One-time1
  • Unlock All Content$2.99

Questions

Is Sumaddle free?
Sumaddle is free to download, with in-app purchases available.
Is Clashdoku free?
Clashdoku is free to download, with in-app purchases available.
Do Sumaddle or Clashdoku have ads?
Neither Sumaddle nor Clashdoku shows ads.

Other comparisons