# Müller-Lyer illusion app — Try Müller Lyer illusion.

> Try Müller Lyer illusion. (iPhone/iPad app by SOCIA LABO, K.K..)

- Source: https://appshunter.io/ios/app/muller-lyer-illusion-app/id6450165949 (this page in markdown: same URL + `.md`)
- Developer: [SOCIA LABO, K.K.](https://appshunter.io/developer/1688326248)
- Category: Utilities, Education
- Price: Free
- Age rating: 4+
- Requires: iOS 12.0 · 30 MB
- Languages: English
- Released: 2023-06-20
- Data updated: 2026-06-01
- User reviews in markdown: https://appshunter.io/ios/app/muller-lyer-illusion-app/id6450165949/reviews.md

## What is Müller?

Here’s the English translation:

This app is a convenient tool for easily experimenting with the Müller-Lyer illusion. No special equipment or paper is needed—just your smartphone to experience the fascinating world of optical illusions.

Key Features:

Super easy to use!
Perfect for classroom lessons and scientific experiments.

Record illusion experiments in sets of 10 trials
Ideal for group projects and individual research.

Scientific data recording
Simply tap where the horizontal lines of outward- and inward-facing figures "appear equal"! The recorded illusion magnitude (in pixels) is helpful for comparisons in subsequent experiments.

Randomized display of ascending and descending series
The order of ascending and descending series is randomized, ensuring unbiased data collection.

Clear display of initial conditions
The app displays the starting position and other conditions at the beginning of each trial, making it convenient for analysis and retrying experiments.

Data saved securely on your device
All experiment results are safely stored on your smartphone. Data management is simple, and retrying is effortless!

Learn while having fun!
Explore the mysteries of optical illusions while improving observation and analytical skills. This app is enjoyable for students, educators, psychology enthusiasts, and anyone curious about the science of perception.

Download now and take your first step into the world of science!


## Version history (last 3 releases)

### 1.2.1 — 2024-12-20

Updated screenshots

### 1.2.0 — 2024-08-12

- Changed to automatically detect the end of each attempt.
- Fixed some bugs.

### 1.0.1 — 2023-06-21

No release notes.

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All apps by SOCIA LABO, K.K.: https://appshunter.io/developer/1688326248

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*