# Hertz Sense — Match the Hz with your wrist

> Match the Hz with your wrist (iPhone/iPad app by seiji honda.)

- Source: https://appshunter.io/ios/app/hertz-sense/id6767974523 (this page in markdown: same URL + `.md`)
- Developer: [seiji honda](https://appshunter.io/developer/1896430544)
- Category: Games, Education, Casual, Trivia
- Price: Free (on sale, was $0.49)
- Age rating: 4+
- Requires: iOS 16.0 · 2 MB
- Languages: Japanese
- Released: 2026-05-17
- Data updated: 2026-08-15
- User reviews in markdown: https://appshunter.io/ios/app/hertz-sense/id6767974523/reviews.md

## What is Hertz Sense?

Hertz Sense is a rhythm-sense mini-game that measures how accurately you can match a target frequency (Hz) using gentle wrist motion only.

■ How to Play
1. Pick a target from 0.5 / 1.0 / 1.5 Hz (or set a custom value in 0.1 Hz steps)
2. Press START — a 3 → 2 → 1 → GO countdown begins
3. Move your iPhone left and right with gentle WRIST MOTION ONLY for 5 seconds
4. The result screen shows your measured Hz, the delta from target, and a graph comparing your motion vs the target

■ Features
- Capped at 1.5 Hz — gentle wrist motion only, no full-arm shaking
- Built-in safety auto-stop if excessive motion is detected
- Mandatory safety guide on first launch
- Two visual themes: Cyber (neon hacker style) and Soft (calm cream)
- Bilingual (Japanese / English) with kid-friendly explanation of frequency
- Fully offline — no network access required

■ Play Safely
- Hold the iPhone firmly with one hand (a wrist strap is recommended)
- Use only your WRIST — do not swing your arm
- Do not use while walking or running
- Play in an open space with no people or objects nearby

A fun way to experience the physics concept of "frequency" with your own body — works well as a learning aid for students too.


## Version history (last 4 releases)

### 2.2.0 — 2026-06-18

- Added background music
- Added a satisfying swoosh sound each time you shake the iPhone
- Added English cheers and haptic feedback on great scores
- Added a Settings screen to toggle music, sound effects, theme, and language

### 2.1.0 — 2026-06-14

- Improved the safety consent screen and in-app safety notices
- Language selection (Japanese / English) now stays consistent across the whole app
- Minor display fixes

### 2.0.1 — 2026-05-30

Updated screenshots.

### 1.0 — 2026-05-17

No release notes.

## More apps by seiji honda

- [Lock2Cam](https://appshunter.io/ios/app/lock2cam/id6767222283)
- [TapStream Hunt](https://appshunter.io/ios/app/tapstream-hunt/id6767384840)
- [Tilt Hit](https://appshunter.io/ios/app/tilt-hit/id6767581735)
- [Causal Loop Diagram](https://appshunter.io/ios/app/causal-loop-diagram/id6769942289)
- [Wash&Shine](https://appshunter.io/ios/app/wash-and-shine/id6769987213)

All apps by seiji honda: https://appshunter.io/developer/1896430544

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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 2026-08-15.*