# Janken Referee — Rock-Paper-Scissors AI Referee

> Rock-Paper-Scissors AI Referee (iPhone/iPad app by Hiroki Tsutsumi.)

- Source: https://appshunter.io/ios/app/janken-referee/id6777606484 (this page in markdown: same URL + `.md`)
- Developer: [Hiroki Tsutsumi](https://appshunter.io/developer/1755691022)
- Category: Photo & Video, Entertainment
- Price: Free
- Age rating: 4+
- Requires: iOS 16.6 · 5 MB
- Languages: American English, Japanese
- Released: 2026-07-20
- Data updated: 2026-10-03
- User reviews in markdown: https://appshunter.io/ios/app/janken-referee/id6777606484/reviews.md

## What is Janken Referee?

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


## Version history (last 1 release)

### 1.0 — 2026-07-20

No release notes.

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## More apps by Hiroki Tsutsumi

- [Fresh Guide](https://appshunter.io/ios/app/fresh-guide/id6514298122)
- [Knit Journal](https://appshunter.io/ios/app/knit-journal/id6760244864)

All apps by Hiroki Tsutsumi: https://appshunter.io/developer/1755691022

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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 2026-10-03.*