i*PRiMES vs Sumaddle
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
i*PRiMES
A minimalist puzzle game designed to enhance number literacy and cognitive skills. Enjoy bite-sized gameplay without timers or pressure, improving your ability to work with numbers in daily life.
- Brain strengthening puzzles
- Improves number literacy
- Bitesize gameplay
- No timers or pressure
- Endless gameplay
- GameCentre scoreboards
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Relax and strengthen your brain with i*PRiMES. Have you ever mastered a puzzle game, and realised all that understanding and those skills can't be applied to anything else in life?? I'm looking at you The Witness! Mastering i*PRiMES means mastering math. i*PRiMES is the puzzle game that improves your ability to work with numbers in your day to day life. Improve your number literacy while enjoying this minimalist puzzle game. Relax and entertain yourself with bitesize gameplay, while building cognitive skills that will help you in life outside of the game. 3 - No timers, no pressure. Complete each puzzle at your own pace. 5 - Improve your mathematics skills and your ability to work with numbers. 7 - GameCentre scoreboards, how well do you know your numbers? 11 - Endless gameplay, your skills and mastery are the limit. This game is free. There are no ads or in app purchases. Reviews & sharing with your friends, children, or math teachers is very much appreciated. Thanks for playing!
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.
- Interactive logic puzzles
- Number combination fitting
- Pure logic solving
- Built-in help and mistake correction
- Over 150 free puzzles
- Offline play
- Ad-free experience
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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 transforming the puzzles into interactive 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 are able to focus on using logic to narrow down the combinations and find a fitting arrangement. The puzzles come in a range of sizes and difficulties, to suit all levels of skill and puzzling purposes. Choose a small puzzle to idle away a minute or two while waiting in a queue, or a big puzzle to give your brain some exercise during a coffee break! Some reasons why you will enjoy playing Sumaddle: • 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
Screenshots
Verdict
The clearest difference is in-app purchases: i*PRiMES at none against Sumaddle's 15. i*PRiMES also leads on update cadence (every 9 days vs every 3 weeks) and iOS requirement (9.0 vs 17.0). Sumaddle's advantage is ratings volume (769 vs 4). On price, rating, review sentiment and ads 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
Both are free to download. Sumaddle sells 15 one-off in-app purchases. i*PRiMES asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for i*PRiMES against 4.9 for Sumaddle. That said, the two scores are not equally well evidenced: Sumaddle has 769 ratings behind it against 4, so its average is the more settled of the two. Written reviews are what separate them: 100% of i*PRiMES's written reviews are positive against 95% of Sumaddle's.
i*PRiMES ships an update every 9 days, Sumaddle every 3 weeks. Both last shipped on October 29, 2026.
| Parameter | i*PRiMES | Sumaddle |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | 4.9 (769 ratings) |
| Positive reviews | 100.0% of reviews — better | 94.9% of reviews |
| Number of ratings | 4 | 769 — better |
| Update frequency | Every 9 days — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 9.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 64 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Dean Longmore | Jonathan Buchanan |
Customer experience
i*PRiMES
Sumaddle
Bugs and requests
i*PRiMES
Not enough reviews yet to summarise bugs or 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
In-app purchases
i*PRiMES
No in-app purchases
Sumaddle
- Quirky, Pack 5$0.99
- Very Difficult Puzzles$0.99
- Quirky, Pack 1$0.99
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- 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









