# Music Spectrograph vs Chorus Lesson

The clearest difference is review sentiment: Music Spectrograph at 50% against Chorus Lesson's 0%. Music Spectrograph also leads on in-app purchases (none vs 10) and device support (3 vs 1). Chorus Lesson's advantage is price ($2.99 vs $9.99) and update cadence (every 2 weeks vs every 6 weeks). On ads there is nothing between them.

Music Spectrograph costs $9.99 and Chorus Lesson $2.99 up front. Chorus Lesson sells 10 one-off in-app purchases. Music Spectrograph asks for nothing beyond the download.

Music Spectrograph ships an update every 6 weeks, Chorus Lesson every 2 weeks. The most recent releases landed on October 17, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Music Spectrograph | Chorus Lesson |
| --- | --- | --- |
| Price | $9.99 | **$2.99** |
| Rating | **[2.5 (4 ratings)](https://appshunter.io/ios/app/music-spectrograph/id432044946/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 228 MB |
| Requires iOS | **12.4** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [HotPaw Productions](https://appshunter.io/developer/285074853) | [NOKKEUSI Inc.](https://appshunter.io/developer/482532151) |

## What reviewers say

### Music Spectrograph

[App page](https://appshunter.io/ios/app/music-spectrograph/id432044946)

Visually reverse engineer sound and music in real-time with a live MIDI piano roll displaying pitch and frequency. Slow down or stop audio to analyze musical patterns, aiding in music transcription and learning.

**Highlights:** Real-time MIDI piano roll, Pitch and frequency visualization, Slow down and stop audio, Music transcription aid, Adjustable playback speed, Color-coded pitch graph

**Features:** Vision Pro support

**In-app purchases:** none


### Chorus Lesson

[App page](https://appshunter.io/ios/app/chorus-lesson/id1515226301)

This app functions as a MIDI player designed for personal choral practice. It allows users to isolate individual parts, adjust volume and panning, and change playback speed for tailored practice sessions. Standard MIDI files can be played, with additional song data available for purchase.

**Highlights:** MIDI player for choral practice, Mute, solo, volume, panning per part, Adjustable playback speed, Play standard MIDI files, Purchase song data in-app

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 30-days Trial for free | Free | one-time |
| BWV227 All through | Free | one-time |
| BWV226-1 Bars 1-145 | Free | one-time |
| Trial for 14 days | Free | one-time |
| BWV226-2 Bars146-244 | $0.99 | one-time |
| BWV226-3 Bars245-268 | $0.99 | one-time |
| BWV226 Complete set | $0.99 | one-time |
| BWV225 Complete set | $0.99 | one-time |
| BWV228; Fürchte dich nicht,... | $0.99 | one-time |
| BWV229; Komm, Jesu, komm | $0.99 | one-time |


## Frequently asked questions

### Is Music Spectrograph free?

Music Spectrograph costs $9.99, with no in-app purchases.

### Is Chorus Lesson free?

Chorus Lesson costs $2.99, and also offers in-app purchases.

### Do Music Spectrograph or Chorus Lesson have ads?

Neither Music Spectrograph nor Chorus Lesson shows ads.

### Which is updated more often, Music Spectrograph or Chorus Lesson?

Music Spectrograph ships an update every 6 weeks, and Chorus Lesson every 2 weeks. Most recently, Music Spectrograph was updated on October 17, 2026 and Chorus Lesson on October 16, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*