# Touch Tonnetz > Interactive visualization of Neo-Riemannian music theory and harmonic relationships. (iPhone/iPad app by Christopher Michaelis.) - Source: https://appshunter.io/ios/app/touch-tonnetz/id1176422445 (this page in markdown: same URL + `.md`) - Developer: [Christopher Michaelis](https://appshunter.io/developer/902580084) - Category: Music, Utilities - Price: Free with in-app purchases - Rating: 3.50/5 from 4 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 13.0 · 87 MB - Languages: American English - Released: 2016-12-08 - Data updated: 2026-09-01 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/touch-tonnetz/id1176422445/reviews.md ## What is Touch Tonnetz? Touch Tonnetz visualizes Neo-Riemannian music theory through the Tonnetz (tonal network) lattice. Tap any chord or note to hear it, see its Neo-Riemannian transformations, and explore harmonic relationships that go beyond traditional tonal progressions. Key Features: Interactive Tonnetz Visualization — Tap any chord or note to hear it and see its Neo-Riemannian transformations highlighted on the lattice Harmonic Analysis — Roman numeral overlays for any tonic, updated in real time Progression Builder — Create, save, and play back melodic progressions Custom Chords — Build and save your own chords for experimentation Three Instrument Sets — Piano, Brass, and Woodwinds, all high-quality samples Six Color Schemes — Three dark, three light Pinch to Zoom — Explore the lattice in detail at up to 4× magnification 7-Day Free Trial — Full access, no restrictions, no nags Perfect For: Composers looking for harmonic paths outside conventional progressions Music theorists studying Neo-Riemannian transformations Musicians experimenting with chord voice-leading Students exploring music theory hands-on What is Neo-Riemannian Theory? Neo-Riemannian theory is a branch of music theory that studies relationships between major and minor triads using transformational geometry. Rather than treating chords as functions within a key (tonic, dominant, etc.), it focuses on the small voice-leading moves — Parallel, Leading-tone exchange, and Relative — that connect one triad to the next. The result is a rich map of chromatic harmony that complements traditional tonal analysis. Why Touch Tonnetz? The Tonnetz lattice makes these relationships spatial: related chords are neighbors, and transformations are visible paths. Touch Tonnetz lets you see the lattice, hear it, and build with it — turning an abstract theoretical framework into something you can explore by ear and by hand. ## Key features - Interactive Tonnetz visualization - Real-time harmonic analysis - Progression builder - Custom chord creation - Multiple instrument sets - Pinch-to-zoom functionality ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Unlock Touch Tonnetz Forever | $9.99 | one-time | ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/touch-tonnetz/id1176422445/reviews.md ### 5/5 — The best NRT app! *2026-04-19* Development has resumed on this app in 2026, and it’s been updated with a few nice enhancements. Thank you to the developer for creating this! ❤️ ### 3/5 — Super useful app, some bugs though *2019-11-03* This is a super useful app, for both music analysts and composers. Kudos to the developer for creating it! Two issues (1 major, 1 minor, lol!): 1. When on a major chord, the PL and PR designations are incorrect, they are switched. PL should be PR, and vice versa. This can easily be checked by breaking up the transformation into its constituents - P(Emaj) = Emin, R(Emin) = Gmaj, so PR(Emaj) = Gmaj; when I have Emaj selected in this app, it tells me that PR = Cmaj (which is actually PL). 2. The background colors are poorly chosen - the minor triad triangles are colored so darkly that it makes reading their chord names (e.g. Emin, etc.) (black text used) VERY difficult. I'd love to see these issues fixed in the next update so I could give 5 stars! ### 3/5 — Volume not working *2017-03-28* It seems like a great tool but for some reason there is no volume for me to hear the chords. I'm using the latest iPhone. This makes it hard for me to recommend this app. Especially with the 5 dollar price tag. Still however it is very helpful for learning Neo-Riemannian theory. **Developer response:** Hi! Thanks for taking the time to write. Do make sure the mute switch on the phone is toggled to unmute - the app won't make any sound if that switch is red. It will also try to use any bluetooth devices, if your phone is connected to a bluetooth audio device. ## Frequently asked questions about Touch Tonnetz ### What is Touch Tonnetz? Touch Tonnetz visualizes Neo-Riemannian music theory using the Tonnetz lattice. It allows users to hear chords and notes, see harmonic transformations, and build progressions. ### Does Touch Tonnetz have ads? No, Touch Tonnetz does not contain advertisements. It offers a free trial and has in-app purchases for full functionality. ### What are the in-app purchases for Touch Tonnetz? The app offers a 7-day free trial with full access. After the trial, in-app purchases are likely required to continue using all features without restrictions. ### What devices does Touch Tonnetz support? Touch Tonnetz is available for iPhone, iPad, and iPod. It is designed for iOS devices. ### How often is Touch Tonnetz updated? The latest version, 4.2, was released on May 27, 2026. The app was originally released on December 8, 2016, indicating it receives periodic updates. ### What is the age rating for Touch Tonnetz? Touch Tonnetz has an age rating of 4+. This suggests it is suitable for a wide audience, including younger learners. ### What instruments are available in Touch Tonnetz? Touch Tonnetz includes three high-quality instrument sets: Piano, Brass, and Woodwinds, allowing for varied sonic exploration. ### Can I save my musical creations in Touch Tonnetz? Yes, the Progression Builder feature allows you to create, save, and play back melodic progressions you design within the app. ## Version history (last 5 releases) ### 4.2 — 2026-05-27 Version 4.2 corrects a small memory leak which could cause chords to stop playing in longer sessions. ### 4.1 — 2026-04-22 Version 4.1 builds on our completely new labelling rework from 4.0, updating font sizes to make the greater amount of information easier to see on small screens. ### 4.0 — 2026-04-14 Version 4.0 brings a complete labelling rework to show more information in an easier to read way. New Help content includes a brief theory primer. There are now six color schemes to choose from including dark and light mode, and graphics are much more crisp - and support pinch to zoom! ### 3.0 — 2026-03-19 Version 3.0 brings a completely revamped underlying engine for better performance, compatibility, and sound quality. ### 2.1 — 2016-12-19 New in 2.1: We've added an option to control how long notes play in custom progressions, and enhanced the sound quality of all notes. New in 2.0: In this version we've streamlined the user interface, hiding less frequently used settings under a settings button making more room for custom chords and notes. We've also added bass notes for Piano, Woodwinds, and Brass! ## More apps by Christopher Michaelis - [ClefMastery](https://appshunter.io/ios/app/clefmastery/id6759814155) All apps by Christopher Michaelis: https://appshunter.io/developer/902580084 ## Related topics [tonnetz](https://appshunter.io/ios/topics/tonnetz) · [touch tonnetz](https://appshunter.io/ios/topics/touch-tonnetz) --- *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 2026-09-01.*