Harmonizer vs GeoShred
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.
GeoShred
This app is a fluidly expressive musical instrument for multi-touch devices. It offers a unique performance surface with advanced pitch rounding and physical modeling of various instruments. Expand your sonic palette with a wide range of purchasable instrument add-ons.
- Fluidly expressive playing surface
- Physically modeled guitar and effects
- Extensive in-app instrument purchases
- AUv3 plugin support
- MIDI/MPE IN/OUT support
- Support for world scales and temperaments
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GeoShred Pro Version 7 With in-app purchases for GeoSWAM and Naada instruments on devices running iOS 13 or later. Imagine a new kind of musical instrument, an instrument that lets performers fluidly express multiple independent voices. An instrument with continuous pitch control that also helps players precisely land on the right note in any temperament. GeoShred Pro is an award-winning, deeply expressive musical instrument for multi-touch devices. Its innovative performance surface features “almost magic” pitch-rounding algorithms and is coupled to physically modeled instruments and effects. GeoShred Pro also supports AUv3, MIDI In/Out, MPE, and 3D Touch. It combines Jordan Rudess’ groundbreaking performance concepts with powerful physically modeled guitar and effects technology based on the research of Dr. Julius O. Smith III of Stanford/CCRMA. GeoShred’s expressive control surface can also be used to play external synthesizers. 300,000 artists in over 120 countries perform with GeoShred, with a strong global community that includes many musicians in India. Awards include: • 2nd Place Winner, 2022/2025 MIDI Innovation Award for Software • Gold Medal Winner, 2019 Denny Award • Winner, 2019 Guthman New Musical Instrument Award • Winner, 2017 Electronic Musician Editor’s Choice Award GeoShred Pro Version 7 Features • Send/Connect support so GeoShred for iOS/iPadOS can control GeoShred Studio for macOS • A fluid, expressive playing surface with finger vibrato, slide, and intelligent pitch rounding • Built-in physically modeled guitar • Physically modeled effects including Distortion, Wah, EQ, VCF, Flanger, Phaser, Chorus, Tremolo, Reverb, Sympathetic Resonator, Echo Looper, Multi-Tap Echo, Amp and Cabinet Modeling, Modeled Feedback for Guitar, and VCF effects • In-app purchases for 22 Naada instruments: Bansuri, Bass, Bass Clarinet, Carnatic Violin, Cello, Dizi, Duduk, Erhu, Gaohu, Guan, Nadaswaram, Pan Flute, Pipa, Rudra Veena, Sarangi, Saraswati Veena, Sarod, Shehnai, Sitar, Suona, Viola, and Zhonghu • In-app purchases for 11 GeoSWAM instruments: GeoViolin, GeoFlute, GeoTenorSax, GeoCello, GeoClarinet, GeoOboe, GeoTrumpet, GeoBassTrombone, GeoBassFlute, GeoViola, and GeoPizzBass • AUv3 plug-in support with parameter automation • iCloud preset synchronization • MIDI/MPE In/Out support • MIDI configuration presets • Customizable control surface mapping to physical MIDI controls • Diatonic keyboard mode, where every key is in the scale • Support for world scales and temperaments, including Indian ragas, Arabic scales, and Balinese scales • 3D Touch support on compatible iPhones • Backing tracks • Built-in arpeggiator • Easy preset sharing via email or iCloud The GeoSWAM and Naada instruments can be performed from the GeoShred keyboard, MPE controllers, conventional MIDI controllers, and wind controllers. Praise for the GeoShred Family of Apps “GeoShred is brilliant—it’s a real instrument.” — Eddie Jobson “A fantastic new invention which is going to revolutionize the way music is played, expressed and learned! ‘GeoShred’ is one of the foremost best musical inventions I’ve had the pleasure to experience in recent years. Definitely 5 stars out of 5! GIGANTASTIVISSIMO…..R…A…Z!!!!!” — Patrick Moraz “That’s just nuts. You’re the best guitarist without a guitar of all time.” — Joe Satriani Our Commitment We are dedicated to providing the highest level of musical instrument experience for our customers worldwide. If you enjoy GeoShred, we would greatly appreciate your positive review on the App Store. If you have any questions, we would love to hear from you at: support@moforte.com Minimum Requirements iOS 13 or later is required for AUv3, iCloud, and GeoSWAM and Naada instruments. * Note: Due to App Store limitations, previously purchased individual instrument in-app purchases cannot be applied toward the purchase of collection in-app purchases.
Screenshots
Verdict
The clearest difference is review sentiment: GeoShred at 91% against Harmonizer's 45%. GeoShred also leads on rating (4.8 vs 4.1) and update cadence (every 2 weeks vs every 33 months). Harmonizer's advantage is price (Free vs $24.99) and in-app purchases (none vs 10). On 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
Harmonizer is free to download; GeoShred costs $24.99 up front. GeoShred sells 10 one-off in-app purchases. Harmonizer asks for nothing beyond the download.
GeoShred holds the better App Store score, 4.8 against 4.1. That said, the two scores are not equally well evidenced: GeoShred has 1.4K ratings behind it against 16, so its average is the more settled of the two. Written reviews point the same way: 45% of Harmonizer's written reviews are positive against 91% of GeoShred's.
Harmonizer ships an update every 33 months, GeoShred every 2 weeks. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | Harmonizer | GeoShred |
|---|---|---|
| Price | Free — better | $24.99 |
| Rating | 4.1 (16 ratings) | 4.8 (1.4K ratings) — better |
| Positive reviews | 45.5% of reviews | 90.7% of reviews — better |
| Number of ratings | 16 | 1.4K — better |
| Update frequency | Every 33 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Best chart rank | — | #91 — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 837 MB |
| Age rating | 4+ | +9 |
| Developer | Matthew McLaughlin | Wizdom Music LLC |
Customer experience
Harmonizer
GeoShred
Bugs and requests
Harmonizer
Not enough reviews yet to summarise bugs or requests.
GeoShred
Reported bugs
2 issues- Inconsistent performance and note retention issues when used with other apps
- Occasional crashes and freezes, especially after updates
Requested features
5 requests- More classic acoustic and electric guitar sounds
- Improved scale and mode selection interface
- Ability to save and load custom presets
- Support for external MIDI controllers and keyboards
- Recording and looping capabilities within the app
In-app purchases
Harmonizer
No in-app purchases
GeoShred
- GeoClarinet$14.99
- GeoCello$14.99
- GeoViolin$14.99
Show 7 moreShow fewer
- GeoTenorSax$14.99
- GeoFlute$14.99
- GeoTrumpet$14.99
- Naada Bansuri$14.99
- GeoSWAM Collection II$59.99
- GeoSWAM Collection Classic$74.99
- GeoSWAM Collection I & II$119.99









