Just Button vs Not Evil Sudoku
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Just Button
This is a minimalist application that provides a single interactive button. Each tap increments a counter displayed on the screen. It offers a distraction-free experience with no advertisements or in-app purchases.
- Single interactive button
- Number counter
- No ads
- No in-app purchases
- No data mining
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No Ads, No In-App Purchases, No Data-Mining. Just Button is incredibly simple. You tap the button, and the number goes up. It is, after all, just a button.
Not Evil Sudoku
Enjoy a distraction-free Sudoku experience with helpful features like hints and real-time validation. Track your progress, compete globally, and customize the app with themes. Play daily puzzles for free or upgrade for unlimited games and advanced statistics.
- Fully offline play
- No ads or distractions
- Real-time move validation
- Shake for hints
- Daily puzzles with leaderboards
- Customizable themes and icons
- Notes and auto-clear notes
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A joyful sudoku-solving experience built natively for iPhone and iPad and optimized for a zen solving experience free from bloat and distraction. Designed to be easy to play and meet you where ever you are in your sudoku journey: a casual solver or a sudoku pro. Stuck on a puzzle? Shake your phone for hints and turn on move by move validation in settings to get immediate feedback on your solve. Tickle your brain as you learn new solving strategies and customize the app to your taste with themes and alternate app icons. Play a daily puzzle at a difficulty of your choice and see where you stack up with players across the globe. Or just turn off the stopwatch and relax. Key features: - Fully offline: no internet required - No ads or distractions - Real-time move validation to get immediate feedback - Shake for a hint on the next logical move - Leaderboards with assist tracking - Easy, Medium, and Hard difficulty levels - Light/Dark mode - Stopwatch and best time tracking - Notes: Keep track of candidates - Auto-clear Notes: removes candidate numbers automatically in row, column, and box when they become outdated - Speed demon: Lock numbers and place them in multiple tiles at once - Arithmophobia: Sudoku with letters instead of numbers - Daily streak tracking - Daily reminder notifications - Highlighter: tap a number to highlight all its instances on the board - Themes to customize the interface (some require Pro) - Alternate app icons (Pro) - Charts and statistics (Pro): track solve speed over time and puzzle count by difficulty Play the daily puzzle at your preferred difficulty for free without any limits on assists or game features. Upgrade to Pro with a one-time purchase to unlock unlimited games, detailed stats, more themes, and alternate app icons. Pro supports Family Sharing.
Screenshots
Verdict
The clearest difference is in-app purchases: Just Button at none against Not Evil Sudoku's 1. Just Button also leads on review sentiment (83% vs 74%) and iOS requirement (13.0 vs 15). Not Evil Sudoku's advantage is rating (4.6 vs 4.3) and update cadence (every 9 days vs every 3 weeks). On price, ratings volume, ads 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
Both are free to download. Not Evil Sudoku sells 1 one-off in-app purchase. Just Button asks for nothing beyond the download.
Not Evil Sudoku holds the better App Store score, 4.6 against 4.3. Both are backed by a comparable volume of ratings — 944 and 983 respectively. Written reviews complicate that: 83% of Just Button's written reviews are positive against 74% of Not Evil Sudoku's, so the app with the better star average is not the one people write more warmly about.
Just Button ships an update every 3 weeks, Not Evil Sudoku every 9 days. The most recent releases landed on September 20, 2026 and September 24, 2026 respectively.
| Parameter | Just Button | Not Evil Sudoku |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (944 ratings) | 4.6 (983 ratings) — better |
| Positive reviews | 83.3% of reviews — better | 73.7% of reviews |
| Number of ratings | 944 | 983 — better |
| Update frequency | Every 3 weeks | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15 |
| Further details — not scored | ||
| Size | 1 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | aleros.io LLC | Ashish Selvaraj |
Customer experience
Just Button
Not Evil Sudoku
User reviews
Just Button
From 944 App Store ratingsWhat we love
- 🚀 Addictive and engaging gameplay
- 👍 Unique and minimalistic design
- 🔒 No ads or in-app purchases
- 💡 Surprising depth and story
- 🚀 Smooth and responsive controls
Room to improve
- 🐛 Occasional bugs and glitches
- 🔊 Loud sound effects that can't be muted
- 🤔 Frustrating mini-games and difficulty spikes
- 🕰️ Repetitive and grindy progression
Not Evil Sudoku
From 983 App Store ratingsWhat we love
- 🚀 Clean, minimalistic design
- 🔒 No ads or tracking
- 👍 Customizable features
- 👍 Good puzzle difficulty
- 👍 Helpful community
Room to improve
- 🐛 Disappearing numbers glitch
- 🐛 App icon doesn't change for dark mode
- ⏱️ Limit of one game per day on free version
- 💰 Paid version considered expensive by some
Bugs and requests
Just Button
Reported bugs
3 issues- Progress reset after purchasing certain upgrades
- Inability to exit certain mini-games without restarting
- Inconsistent button responsiveness
Requested features
3 requests- Option to disable sound effects
- Ability to save progress and resume later
- More variety in gameplay and mini-games
Not Evil Sudoku
Reported bugs
2 issues- Disappearing numbers when closing the app
- Numbers swapping to incorrect spots
Requested features
6 requests- Add auto-clear notes option without move validation
- Provide more theme color options
- Implement a 'warm' mode similar to other sudoku apps
- Add ability to remove notes after number is placed
- Highlight all instances of a number in the puzzle
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- Remove a number as a choice when it has been placed successfully
In-app purchases
Just Button
No in-app purchases
Not Evil Sudoku
- Pro$4.99
