# GRAB

> Experimental synthesizer using iPhone's magnetic sensor to generate sound from electromagnetic waves. (iPhone/iPad app by Hiroya Tanaka.)

- Source: https://appshunter.io/ios/app/grab/id6773259322 (this page in markdown: same URL + `.md`)
- Developer: [Hiroya Tanaka](https://appshunter.io/developer/1887542375)
- Category: Music, Entertainment
- Price: $3.99
- Age rating: 4+
- Requires: iOS 17.0 · 2 MB
- Languages: American English
- Released: 2026-05-28
- Data updated: 2026-08-08
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/grab/id6773259322/reviews.md

## What is GRAB?

GRAB は iPhone の磁気センサーで周囲の電磁波を「受信」し、音として鳴らす実験的シンセサイザーです。電源アダプタ、モーター、ディスプレイ、Wi-Fiルーターなど身の回りの電磁的なノイズを音源にして、フィールド録音のように演奏します。

【サウンドエンジン】
・ETHER 風の 5 層: メインハム / PWM バズ / スタティックヒス / ハイスキール / パルストレイン
・センサー連動の 3 層シンセボイス: 鋸波 / 矩形波 / ノイズ
・カメラON時はレンズへの光量変化が音量・音色のトレモロを駆動

【エフェクト】
・CRUSH（ビットクラッシュ）
・COMB（コムフィルター）
・REVERB（残響＋シマー）
・STUTTER（BPM同期のリピート）
・各エフェクトに HOLD ラッチ機能

【Ableton Link】
・Live / Logic / 他 iOS DAW と自動テンポ同期
・STUTTER は Link の BPM で 1/4・1/8・1/16・1/32 拍に同期
・公式 Link 設定画面に対応

【ビジュアル】
・3D ポイントクラウドの周波数スペクトラム
・スペクトラムバー表示モード
・カメラON時はグレースケール映像と立体的に合成

【こんな使い方】
・電化製品の近くで音色変化を楽しむフィールドサウンドツール
・Live セッションに加えるアトモスフェリックな効果音発生装置
・電磁的なノイズミュージックの実験プラットフォーム

【プライバシー】
音はすべて端末内で処理され、外部に送信されません。Ableton Link はローカルWi-Fi 内のみで通信します。

## Key features

- Electromagnetic wave to sound conversion
- Multi-layered sound engine
- Sensor-linked synth voices
- Camera-driven tremolo effect
- Bitcrush, comb filter, reverb, stutter effects
- Ableton Link tempo synchronization
- 3D point cloud frequency spectrum visualization

## Chart rankings

- #173 in Top Paid · Music (US App Store)

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/grab/id6773259322/reviews.md

### 5/5 — A rare electronic instrument and a work of art

*2026-06-11*

An app created with a stroke of genius. It functions both as an instrument for creating experimental music and as a sound art piece.

## Frequently asked questions about GRAB

### What is GRAB?

GRAB is an experimental synthesizer for iPhone that uses the device's magnetic sensor to capture ambient electromagnetic waves and convert them into sound. It allows users to create music from the electromagnetic noise of everyday electronics.

### How does GRAB work?

GRAB utilizes your iPhone's magnetic sensor to detect electromagnetic fields from nearby devices like power adapters and Wi-Fi routers. These detected fields are then processed and translated into audible sound through its unique sound engine.

### What kind of sounds can GRAB create?

GRAB offers a multi-layered sound engine with five 'ETHER' inspired layers and three sensor-linked synth voices (sawtooth, square, noise). It also includes effects like bitcrush, comb filter, reverb, and stutter for further sound manipulation.

### Can GRAB sync with other music software?

Yes, GRAB supports Ableton Link for automatic tempo synchronization with DAWs like Ableton Live, Logic, and other iOS music applications. The stutter effect can also sync to the Link BPM.

### Is GRAB suitable for live performances?

GRAB can be used as an atmospheric sound effect generator for live sessions or as an experimental platform for noise music. Its ability to sync with other devices via Ableton Link makes it a versatile tool for live setups.

### What are the visual features of GRAB?

GRAB features a 3D point cloud frequency spectrum visualization. When the camera is on, it can also display a grayscale video feed that is integrated with the spectrum for a unique visual experience.

### Does GRAB have ads?

No, GRAB does not contain advertisements. As a paid application, it offers an uninterrupted user experience without any ad interruptions.

### What is the price of GRAB?

GRAB is available for a one-time purchase of $3.99. This price grants you full access to all features and functionalities of the application.

## Version history (last 3 releases)

### 1.0.2 — 2026-06-01

【改善】
・他のオーディオアプリ（GarageBand、Ableton Note 等）と同時に鳴らせるようになりました
・起動順に関わらず、Ableton Link で複数アプリのサウンドを重ねて演奏可能に
・バックグラウンド再生の安定性をさらに向上

### 1.0.1 — 2026-05-28

【バグ修正】
・バックグラウンド再生が正しく動作するようになりました
・ホーム画面からアプリに戻った際の一瞬の音量低下を解消

【UI改善】
・LINKボタンの表記を「Ableton LINK」に変更
・CAM/LINKボタンの視認性を向上
・小型端末でもUIが1画面に収まるよう自動調整

### 1.0 — 2026-05-28

No release notes.

## More apps by Hiroya Tanaka

- [ATMÓS](https://appshunter.io/ios/app/atmos/id6761055879)
- [CLICK – weather drum machine](https://appshunter.io/ios/app/click-weather-drum-machine/id6776584609)

All apps by Hiroya Tanaka: https://appshunter.io/developer/1887542375

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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 2026-08-08.*