# Music Box Retro Go

> 6 Classics, Zero Data

Canonical page: [https://chrome-stats.com/d/id6771277053](https://chrome-stats.com/d/id6771277053)

## Overview

- **ID:** `id6771277053`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** 晓 郭
- **Category:** Music
- **Version:** 1.0
- **Last updated:** 2026-05-21
- **First published:** 2026-05-21
- **Size:** 733 KB
- **Data as of:** 2026-09-22
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/music-box-retro-go/id6771277053)
- **Privacy policy:** [https://adler0518.github.io/apps\_privacys/MusicBoxRetro-privacy.html](https://adler0518.github.io/apps_privacys/MusicBoxRetro-privacy.html)

## Description

AVAudioEngine bell-tone synthesis. 6 classic melodies. Unlock system tied to play count. Adjustable speed. 100% offline, no ads, no tracking.

Music Box Retro is a precision-crafted virtual music box built with AVAudioEngine bell-tone synthesis, delivering authentic plucked-string timbre for 6 classic melodies.

TECHNICAL HIGHLIGHTS
- Custom AVAudioSourceNode renders each note as a sine wave with harmonic overtone (12% third harmonic) and exponential amplitude decay — matching the acoustic signature of a real music box
- 6 MIDI-encoded melodies: Twinkle Twinkle, Ode to Joy, Brahms Lullaby, Canon in D motif, Fur Elise motif, Sakura
- Progressive unlock system: melodies unlock at 3, 8, 15, 25, and 40 total play counts
- Playback speed: 0.5x to 2.0x in 0.1x increments
- UIFeedbackGenerator haptics synchronized per-note
- AppStorage-backed persistence for play count and selected melody
- Portrait orientation only
- Forced dark color scheme

PRIVACY AND DATA
Music Box Retro operates entirely on-device. No network requests, no analytics, no crash reporting, no third-party SDKs. Zero data collected or transmitted.

## Rankings

- #1,668,544 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6771277053)