Harmonizer vs Music Wrench
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Harmonizer
This app helps infants develop perfect pitch by playing Shepard tones, aiding in pitch identity development. It also facilitates the study of chord relationships and displays the pitch of your singing.
- Shepard tone playback
- Pitch identity development
- Chord relationship study
- Vocal pitch display
- Infant music education
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See and hear how music fits together. Harmonizer turns musical relationships into a colorful, interactive grid. Tap a hexagon to hear a note, or tap the triangle between three notes to play a major or minor chord. Sing or play a single note on an instrument, and watch the detected pitch light up. EXPLORE NOTES AND CHORDS Discover how neighboring notes connect through perfect fifths, major thirds, and minor thirds. Major and minor chords form triangles, making harmony something you can see, hear, and explore with your fingers. SEE YOUR VOICE Use the microphone to highlight the pitch you sing or play. Listen to a note, try matching it with your voice, and explore the connection between sound and color. CHOOSE YOUR LABELS Show note names or Movable Do syllables, with your choice of tonic. Keep labels visible, show them only when notes are active, or hide them to focus on the colors and sounds. EXPLORE YOUR WAY Choose from playing, pitch detection, or a mode that listens when you stop playing. Adjust the grid size to suit your screen and how you like to interact. HEAR HARMONY DIFFERENTLY Harmonizer uses Shepard tones—layered sounds that emphasize a note’s identity without a distinct octave. Every hexagon with the same note name produces the same sound. For curious beginners, students, teachers, and musicians, Harmonizer offers a hands-on way to explore pitch, chords, and musical patterns. No music theory knowledge is needed to start: touch a note and listen. Pitch detection requires microphone access.
Music Wrench
This app analyzes violin playing in real-time, providing visual feedback on intonation and timing. It offers features like a unique double-stop tuner, session recording, and sheet music markup. Users can practice with included exercises or import their own music.
- Real-time intonation and timing analysis
- Double stop tuner
- Session recording and playback
- Sheet music markup and scoring
- Scales and arpeggios
- Metronome
- MusicXML import
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Transcribes violin playing in real-time, allowing you to see your intonation and timing as you play. Play with included sheet music or freestyle. Free to download and try out. Tuning strings, record/playback, and metronome are free. Other features can be sampled before purchase. - The only tuner that works for double stops - Records your session so you can review your playing - Sheet music gets marked up as you play and scored at the end - Scales and arpeggios in all keys from 1 to 3 octaves with accelerating patterns - Includes metronome with option to display beats and accent certain beats - Intonation colors, sensitivity, and temperament, and reference A are configurable - Synthesize songs and recordings to hear the correct intonation and timing - Import your own songs from MusicXML - Save recordings to .wav file - Customizable displays including treble staff, pitch graph, precision intonation, and double stop interval - Optimized for iPad and iPhone in landscape and portrait orientation. Current subscription price is $0.99 per month and auto-renews. – Payment will be charged to iTunes Account at confirmation of purchase – Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period – Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal – Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase – Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable Terms and Conditions: http://www.musicwrench.com/terms Privacy Policy: http://www.musicwrench.com/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: Harmonizer at none against Music Wrench's 3. Music Wrench's advantage is review sentiment (79% vs 45%) and rating (4.5 vs 4.1). On price, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Music Wrench sells 3 in-app purchases, starting at $0.99 per month. Harmonizer asks for nothing beyond the download.
Music Wrench holds the better App Store score, 4.5 against 4.1. Both are backed by a comparable volume of ratings — 16 and 21 respectively. Written reviews point the same way: 45% of Harmonizer's written reviews are positive against 79% of Music Wrench's.
Harmonizer ships an update every 33 months, Music Wrench every 2 months. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.
| Parameter | Harmonizer | Music Wrench |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (16 ratings) | 4.5 (21 ratings) — better |
| Positive reviews | 45.5% of reviews | 79.3% of reviews — better |
| Number of ratings | 16 | 21 — better |
| Update frequency | Every 33 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Subscription |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 13.4 — better |
| Further details — not scored | ||
| Size | 3 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Matthew McLaughlin | Alden Doyle |
Customer experience
Harmonizer
Music Wrench
In-app purchases
Harmonizer
No in-app purchases
Music Wrench
- Subscription7 Days trial$0.991 Month
- Practice Mode$4.99
- Purchase$9.99









