Duometry takes a simple mathematical concept and turns it into an incredibly addictive, elegant casual game. Testing how accurately your eye can judge a 47-degree angle vs a 52-degree angle sounds straightforward, but it creates instant competitive tension.
The pass-and-play multiplayer mode is a standout feature for party settings. Keeping everyone's guesses hidden until the final reveal leads to great moments of playful rivalry. The UI is clean, modern, and completely distraction-free.
Whether you are playing the daily spatial memory challenge or passing the phone around among friends, Duometry is a clever, refreshing puzzle title.
As a gamer who respects a title that doesn't hold your hand and actually demands genuine cognitive effort, Duometry caught my attention immediately. The concept of controlling two geometric objects moving in tandem across separate paths sounds simple on paper, but in practice, it forces your brain into a state of intense split-attention synchronization. When you finally nail a fiendishly complex synchronization puzzle after twenty failed attempts, the sense of accomplishment is genuinely earned. Combined with a sleek minimalist aesthetic and clean electronic sound design, it represents the kind of pure, unadulterated puzzle challenge that mobile platforms do best.
At the same time, I have to warn players that this game is aggressively unforgiving. Its reliance on trial-and-error memorization means you will fail repeatedly, and for players lacking ironclad patience, the difficulty spikes can easily cross from challenging into outright frustrating. There is no narrative fluff or hand-holding here—just pure mental endurance tests. If you enjoy brain-burning logic puzzles like *Threes* or *Blackbox*, Duometry is well worth your time; casual puzzle fans should keep their distance.
Performance: Impeccable touch responsiveness and butter-smooth frame rates essential for precise timing.
Buy if: You love hardcore logic puzzles, minimalist design, and games that test your split-attention coordination.
Skip if: You get frustrated easily by trial-and-error gameplay, difficult timing challenges, or lack patience.
Available on: iPhone
Version 1.0.3Mon Oct 26 2026
- minor fixes
Requires iOS 17.0 or later. Compatible with iPhone, iPad, and iPod touch.How well can you judge an angle?
Duometry challenges you to match a target angle as closely as you can. Fold a compatible device or adjust the on-screen dial, lock in your guess, and discover how close you came.
Play solo over 5 or 10 rounds and aim for your best score.
Pass one device between 2–8 players for a friendly competition. Everyone’s guesses stay hidden until the shared reveal. Find out who came closest, compare scores, and keep playing.
Explore angles at your own pace with the dial. On hinge devices, Free Measure lets you read the device’s fold angle directly.
Come back for a daily challenge with three targets. Different daily modes put your angle intuition and visual memory to the test.
Play offline, with no account required.





Duometry is an innovative casual angle-guessing game created by Arno Appenzeller. Challenge your visual intuition by matching target degree angles using on-screen dials or physical device hinges. Play solo, conquer daily challenge modes, or pass one device around for competitive local multiplayer.
Precision angle estimation mechanics with dial controls
2-8 player local pass-and-play party mode
Daily target challenges to train spatial memory
Offline play with no account required
Official listing.
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Compete over 5 or 10 rounds to score points based on degree proximity. Pass the phone between up to 8 friends with hidden guesses until the grand group reveal.
Up to 8 players can play together on a single device in pass-and-play mode.