Overpaint vs The Devil's Calculator
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Overpaint
This game challenges you to match colored squares with circles by dragging and dropping. Create new colors by overlapping squares. It offers a relaxing yet engaging puzzle experience with unique levels and interesting color facts.
- Drag-and-drop color matching
- Color mixing by overlapping squares
- 225 unique moving puzzles
- 100 color facts
- Simple and clean design
- Challenging gameplay
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Overpaint is all about color in motion. The goal is simple: drag-and-drop the squares over the matching circles to clear them. To make new colors just overlap the 3 squares. Seems easy, right? You have all the time yet each move counts… Observe the colorful moving patterns and sharpen your skills. Join the color fun! • Free to play • 225 unique moving puzzles • 100 curious color facts • Simple and clean design: less is beautiful! • Easy to play but tricky to master • Drag the squares by their corners and cover the circles • Play at your own pace: think twice, slide once • Challenge your friends and beat their scores • Purchasable lives and moves (optional) Enjoy mixing colors with Overpaint! "Overpaint app is addictive in a colorful way" – Examiner "...an edutaining, artistic puzzler all about color and how it amazingly meshes" - AppAdvice "Overpaint takes 3 colors and makes a tremendous puzzle game" - AppAttack "All the fun and none of the mess" - IdTapThat Featured in the AppStore worldwide - "Best New Games" Find out more: www.landka.com Send your feedback: hello@landka.com
The Devil's Calculator
This math puzzle game challenges you to decipher obscure operators on a calculator. Solve algebraic puzzles by working backward to understand the functions and purge the calculator of its demons. It's an addictive and educational experience with user-created levels and DLC.
- Obscure operator deciphering
- Algebraic puzzle solving
- User-created levels
- DLC levels by mathematicians
- Graphing mechanics
- Hand-drawn artwork
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An evil calculator has its normal arithmetic operators replaced with sadistically obscure functions. Using logic and algebraic puzzle solving, you must work backwards to interpolate them and purge the calculator of its demons. Non-profit and open-source, The Devil's Calculator is a highly original indie game that's as addicting as it is educational. Accessible to numberphiles and math novices alike, the first 20+ levels are 100% free to play and enjoy along with several DLC levels, authored by famous mathematicians like Alex Bellos, Grant Sanderson, James Grime, Tony Padilla and James Tanton! The game was named a fan favorite of GDWC, and one of the top 10 indie games of 2019 by PAX. Each level has you decipher the function of a mysterious operator and use it to calculate the number of the beast to progress. Advanced graphing mechanics, countless features and simple, yet innovative level design provide considerable depth to the gameplay. Players unlock the ability to create their own levels and play challenges others have created - including free DLC levels crafted by the game's creators, educators and mathematicians. With hand drawn artwork and a charming story, the Devil's Calculator is a genuinely fun and gratifying puzzle experience. The game was celebrated at the MOVES conference by the National Museum of Mathematics in New York City. Cinq-Mars Media is a 501(c)(3) non-profit organization developing technology to support scientific research related to human safety and education, and to make such technology and research available on a charitable basis.
Screenshots
Verdict
The clearest difference is rating: The Devil's Calculator at 4.8 against Overpaint's 3.8. The Devil's Calculator also leads on review sentiment (85% vs 62%) and update cadence (every 10 days vs every 5 weeks). On price, ratings volume, ads 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
Both are free to download. Overpaint sells 5 one-off in-app purchases and The Devil's Calculator sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
The Devil's Calculator holds the better App Store score, 4.8 against 3.8. Both are backed by a comparable volume of ratings — 133 and 247 respectively. Written reviews point the same way: 62% of Overpaint's written reviews are positive against 85% of The Devil's Calculator's.
Overpaint ships an update every 5 weeks, The Devil's Calculator every 10 days. The most recent releases landed on November 1, 2026 and November 11, 2026 respectively.
| Parameter | Overpaint | The Devil's Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (133 ratings) | 4.8 (247 ratings) — better |
| Positive reviews | 61.9% of reviews | 85.4% of reviews — better |
| Number of ratings | 133 | 247 — better |
| Update frequency | Every 5 weeks | Every 10 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 77 MB |
| Age rating | 4+ | 4+ |
| Developer | Landka | Cinq-Mars Media |
Customer experience
Overpaint
The Devil's Calculator
User reviews
Overpaint
From 133 App Store ratingsWhat we love
- 🎨 Beautiful color-mixing puzzle concept
- 🎵 Relaxing and enjoyable music
- 😌 No ads or minimal monetization
- 🧩 Engaging puzzle gameplay
- 🎯 Simple yet challenging mechanics
Room to improve
- 🐛 Frequent app crashes on startup
- 🐛 Game crashes after closing mid-level
- 🐛 Crashes when running out of lives
- ☝️ Notification center interference on top screen
- ⏸️ Game progress not saved to Game Center
The Devil's Calculator
From 247 App Store ratingsWhat we love
- 💡 Most creative idea ever
- 🧠 Genius puzzle design
- 👍 Fun and educational
- 🚀 Brilliant game concept
- 🤓 Great for math lovers
Room to improve
- 😠 Tedious late puzzles
- 🐛 Calculator responsiveness issues
- 🐛 Wolfram graphing feature doesn't work
- 🐛 Progress saving issues
- 🐛 Calculator malfunction
Bugs and requests
Overpaint
Reported bugs
12 issues- App crashes immediately after pressing play button
- App crashes when closing mid-level and reopening
- App crashes after running out of hearts/lives
- Level 45 yellow bar doesn't reach far enough
- Level 66 yellow cannot cover bottom circle
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- Level 69 yellow doesn't extend sufficiently
- Level 103 yellow screen blocks dot resolution
- Level 167 impossible to complete on iPhone 6 due to screen proportions
- Dragging colors from top triggers notification shade instead
- Game progress resets despite Game Center sync
- Color dragging drops without proper placement
- Incorrect color mixing information in tutorials
Requested features
8 requests- More levels beyond current maximum
- Undo move functionality
- Ability to earn lives through gameplay
- Larger interaction area away from notification shade
- Seamless level transitions
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- Continuous background music loop
- No life requirement for replaying completed levels
- Faster app transitions and loading
The Devil's Calculator
Reported bugs
9 issues- Some late puzzles with the third operator get too tedious with too much trial and error
- The built-in calculator needs some work and button responsiveness isn’t always the best.
- The graph to wolfram alpha function doesn’t seem to work.
- There’s unfortunately an exploit I accidentally discovered that allows you to bypass any level.
- The “real” calculator malfunctions when you want to use the answer you got previously, like if I input “330 * 2”, getting 660, then pressed “+6” on the next row, instead of showing 660 + 6 = 666, it’d show 2+6 = 8
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- Lost progress again from 38 to 33. iPhone XS Max, iOS 12.4.1.
- My progress seems to be undone somewhat arbitrarily. I was working through the 50s, and when I booted up the game today, my progress had reset to level 35.
- The wolfram graphing feature doesn’t work.
- There’s a problem with DLC LEVEL 6 however.
Requested features
3 requests- Update the app
- Fix DLC Level 6
- More levels
In-app purchases
Overpaint
- Refill lives$0.99
- Unlock gate$0.99
- +3 moves$0.99
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- Remove ads$0.99
- Lives forever$2.99
The Devil's Calculator
- Full Version of Game$2.99









