Twelve Tone vs GCS Model 8 Mobile
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Twelve Tone
This app helps musicians and teachers compose and analyze music using dodecaphonic and set theory. It allows users to enter tone rows, automatically generates musical matrices, and provides playback and sharing options for compositions.
- Enter tone rows via staff or piano keyboard
- Automatic generation of Prime, Inversion, Retrograde, RI matrices
- Real-time Interval Vectors and Circular Analysis updates
- Save and manage tone rows with names and markings
- Share PDF of notation, keyboard, and analysis
- Listen to row playback with selected rhythm patterns
- Matrix audio playback for pitch identification
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An extensive music composition and analysis tool. An indispensable resource for any musician or music teacher interested in dodecaphonic and set theory analysis. • Enter a tone row by touching the staff or playing the piano keyboard. • It lets you know if any notes are repeated by highlighting both notes, checking enharmonic values regardless of octave or accidentals. • Automatically creates the Prime, Inversion, Retrograde, and Retrograde Inversion Magic Square. • Constantly updates the Interval Vectors and Circular Analysis of the tone row as you edit it. • Save your rows (rows may contain from 1 to 12 notes), complete with name and current P, R, I, RI matrix markings. Saved rows appear in a list with their name and midi numbers to help you identify them. • Share a pdf of the notation, piano keyboard, and circular analysis. • Watch and listen to your row played with a selected rhythm pattern. • Playback: - Prime - Prime then Retrograde - Retrograde then Prime - Retrograde - Inversion - Inversion then Retrograde Inversion - Retrograde Inversion then Inversion - Retrograde Inversion • Each can be repeated and transposed with each iteration. • The Root is kept within an octave above and below the original pitch when looping and transposing. • Matrix Audio: Hear the pitches as you mark them in the matrix square. The marks indicate the row form in which the pitch belonged; Prime, Inversion, Retrograde, and Retrograde Inversion. • Lock the prime row and transpose it to C to use the Absolute Pitch Method for row labeling in the matrix. Comes preloaded with the following rows: Alban Berg's Lyric Suite Babbitt's Composition for Four Instruments Schoenberg's Variations for Orchestra Op.31 Schoenberg's Piano Piece Op.33a Webern's Concerto Op.24 Webern's Piano Variations Op.27 Webern's String Quartet Op.28
GCS Model 8 Mobile
This pocket-sized music production tool simulates analog tape recording with a realistic physics engine. It offers 8-track recording, built-in instruments, drum machines, and samplers for creative sound design on the go.
- 8-track recording with tape transport controls
- Realistic analog tape physics simulation
- Built-in synthesizers and drum machines
- MPC-style pad sampler
- Support for various tape formats
- Bluetooth MIDI keyboard compatibility
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GCS Model 8 is a free, pocket-sized 8-track tape DAW for iPhone. It has a full blown physics engine which runs in the background and models classic reel-to-reel machines and various formats ranging from LoFi cassette to HiFi 1" tape. The engine is the exact same as the one used in the professional desktop recording version, but still runs very nicely on iPhone. GCS Model 8 for iPhone is completely free, with no in-app purchases, subscriptions, or ads. I really want people to have the engine as a fun tool for mobile settings without any sort of catch. Features: • 8-track recording with a real tape transport (play, record, rewind, fast-forward, punch, scrub) • Analog tape physics: adjustable wow, flutter, stickiness, head gap, hiss, and age • Built-in effects and tape techniques: reverse, SOS, punch, click track, loop • Built-in instruments: A-1 Mono Synth, A-10 Poly Synth, Glissandio (Ondes Martenot style slide synth), Stage Keyboard • Voxtone Drum Machine: synthesized analog drums with a dedicated step-sequencer (MATRIX) and live-trigger (PADS) view, plus two sample-based kits (808, Acetone) • 8-pad MPC-style Pad Sampler: load your own samples or mic them in directly, with pitch, trim, and gate controls • Reels: save, load, and share your sessions • Bluetooth MIDI keyboard support • Importing recordings to hit them to tape • Sound of Sound looping (Fripp style) • Formats: cassette, 1/4", 1/2" and 1" - along with various presets •Most of the features found on the desktop version Reels you create on iPhone move over to GCS Model 8 for iPad and GCS Model 8 for Mac/Windows, which add more tracks, more effects, and full export/mixdown for when you're ready to take a session further.
Screenshots
Verdict
The clearest difference is price: GCS Model 8 Mobile at Free against Twelve Tone's $4.99. GCS Model 8 Mobile also leads on review sentiment (100% vs 70%) and update cadence (every 5 days vs every 18 months). On rating, ratings volume, ads and in-app purchases 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
GCS Model 8 Mobile is free to download; Twelve Tone costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.7 for Twelve Tone against 4.8 for GCS Model 8 Mobile. Both are backed by a comparable volume of ratings — 16 and 44 respectively. Written reviews are what separate them: 70% of Twelve Tone's written reviews are positive against 100% of GCS Model 8 Mobile's.
Twelve Tone ships an update every 18 months, GCS Model 8 Mobile every 5 days. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.
| Parameter | Twelve Tone | GCS Model 8 Mobile |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.7 (16 ratings) | 4.8 (44 ratings) — better |
| Positive reviews | 70.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 16 | 44 — better |
| Update frequency | Every 18 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 26.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 50 MB | 135 MB |
| Age rating | 4+ | 4+ |
| Developer | Patrick Q. Kelly | will patterson |
Customer experience
Twelve Tone
GCS Model 8 Mobile
In-app purchases
Twelve Tone
No in-app purchases
GCS Model 8 Mobile
No in-app purchases
Questions
Is Twelve Tone free?
Is GCS Model 8 Mobile free?
Which has better reviews, Twelve Tone or GCS Model 8 Mobile?
Do Twelve Tone or GCS Model 8 Mobile have ads?
Which is updated more often, Twelve Tone or GCS Model 8 Mobile?
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