# Janken Referee

> Rock-Paper-Scissors AI Referee

Canonical page: [https://chrome-stats.com/d/id6777606484](https://chrome-stats.com/d/id6777606484)

## Overview

- **ID:** `id6777606484`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Hiroki Tsutsumi
- **Category:** Photo & Video
- **Version:** 1.0
- **Last updated:** 2026-07-20
- **First published:** 2026-07-20
- **Size:** 4.70 MB
- **Data as of:** 2026-09-19
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/janken-referee/id6777606484)
- **Privacy policy:** [https://grave-amphibian-76f.notion.site/Privacy-Policy-371cb437852d80459c5cd68c0408cf4c](https://grave-amphibian-76f.notion.site/Privacy-Policy-371cb437852d80459c5cd68c0408cf4c)

## Description

Hold your hands up to the camera and Janken Lens calls the winner instantly. All processing is on-device — no image leaves your iPhone. Great for play and learning.

Janken Referee recognizes hand gestures (rock, scissors, paper) in real time through your iPhone's camera and automatically calls the winner of a rock-paper-scissors match. ("Janken" is the Japanese word for rock-paper-scissors.)                                                                                                                                                                          

  ■ Highlights

  • Just point the camera at two or more hands — the winner is called automatically                                                                                                                       
  • Winning hands are highlighted in a distinct color for instant clarity
  • 100% on-device processing. No camera frame ever leaves your iPhone
  • Free, no ads, no account required                                                                                                                                                                     

  ■ How People Use It

  • Settle a rock-paper-scissors match between family or friends instantly
  • Works with three or more players, not just two
  • A teaching aid in classrooms and childcare settings                                                                                                                                                   
  • A novelty effect for streams and video content

  ■ Privacy by Design

  Janken Referee is built with user privacy as the top priority.                                                                                                                                          

  • Camera frames are processed exclusively on-device using Apple Vision                                                                                                       
  • No camera data, detection result, or other information is transmitted to any external server
  • No analytics SDK, no advertising SDK, no tracking of any kind
  • No personal information is collected                                                                                                                                                                  

  ■ Misclassification Reports (Opt-In)

  Janken Referee includes an optional feature that lets you send a report to the developer when a judgment was incorrect, helping improve future accuracy.                                                

  • Disabled by default. Active only when explicitly enabled in Settings                                                                                                                                  
  • Reports stay on your device unless you explicitly send them via the iOS Mail app
  • The recipient address is always visible in Settings before you export                                                                                                                                 
  • Up to 50 reports are stored locally; oldest reports are removed automatically
  • You can delete reports individually or all at once at any time                                                                                                                                        

  ■ System Requirements                                                                                                                                                                                   

  • iOS 16.6 or later
  • Camera access required
  • Photo Library "Add Only" access required only when saving images

  ■ Support and Contact

  For questions, feature requests, or bug reports:       
  jankenlens@gmail.com

  Privacy Policy:
  https://grave-amphibian-76f.notion.site/Privacy-Policy-371cb437852d80459c5cd68c0408cf4c

  Support:
  https://grave-amphibian-76f.notion.site/Support-371cb437852d808a861dd545ac19aec5

## Rankings

- #2,200,386 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6777606484)