Scaler 3 vs StringVest
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Scaler 3
This music theory workstation helps you discover chords, explore harmony, and build complete musical ideas. It offers a redesigned workflow, expanded creative potential, and powerful new capabilities for songwriting and music production.
- Discover music's key with MIDI and audio detection
- Access over 1,000 chord sets, keys, and modes
- Build intelligent chord progressions with automatic voice-leading
- Structure full musical ideas with Scenes and Arrange Page
- Transform chords into melodies, basslines, and phrases
- Explore harmony with Circle of Fifths and modulation tools
- Host AUv3 plugins and interoperate with desktop versions
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The world’s most popular music theory workstation, Scaler 3, is now available on iPad — updated to Scaler 3.3 with Multi-Bind, improved Detection, enhanced workflow and desktop interoperability. With a redesigned workflow, expanded creative potential and powerful new capabilities, Scaler 3 helps you discover chords, explore harmony and build complete musical ideas. The workflow doesn’t have to end with your finished chord progression - Scaler 3 can host AUv3 plugins and features a full arranger and mixer, letting it fit into your existing setup or become your entire creative environment for music theory. Browse Draw from over 1000 chord sets, keys and modes, organised by mood, artist and genre. Build chord progressions by dragging and dropping chords, and receive intelligent suggestions for what could come next. Create Explore harmonic possibilities using tools like the Sketch Pad, Explore page, Circle of Fifths and Modulation pathways. Scaler’s creative tools and music theory assistance help you move beyond common progressions and discover new musical ideas. Arrange Turn your progression into a full musical sketch with tracks for chords, bass, melodies and custom MIDI patterns. Use Multi-Bind to perform and loop multiple lanes at once, creating fast composition ideas and live performance workflows. Scaler 3 can generate MIDI for all sorts of instruments and adapt it to the needs of your song. Host AUv3 plugins to play your parts, transforming Scaler 3 into a powerful composition and MIDI production environment. Key Features • Discover your music’s key with MIDI and audio detection and explore compatible scales, modes and chord sets • Access over 1,000 chord sets, keys and modes organised by mood, genre and artist inspiration • Build intelligent chord progressions with automatic voice-leading • Use Scenes and the Arrange Page timeline to structure full musical ideas • Transform chords into melodies, basslines, arpeggios and phrases using Scaler’s Motions library • Explore harmony using the Circle of Fifths, chord substitutions, inversions and voicing tools • Experiment with modulation suggestions to move between keys • Record ideas directly with User Track and edit them in the piano roll • Perform one-finger chords and melodies using Bind MIDI • Route generated chords and performances to other music apps using AUv3 and MIDI output • Play progressions using internal instruments including pianos, synths and orchestral sounds • Works standalone or alongside apps like Logic Pro for iPad, GarageBand, AUM and Cubasis • Move between Scaler 3 on iPad and desktop by sharing presets, chord progressions and files Content • Thousands of chords, scales and harmonic possibilities • Artist chord sets created by musicians including Carl Cox, MJ Cole and The Temper Trap • Generate MIDI with hundreds of melodic phrases, basslines and performances • Internal instrument library including pianos, synths and orchestral sounds Perfect For • Songwriting • Music production • Composition • Learning harmony and music theory • Exploring new musical ideas What People Are Saying “Scaler 3 is an incredibly powerful music theory tool. It's a gamechanger for both beginners and seasoned producers.” -David Wills (Michael Jackson, Whitney Houston, Phil Collins) “Scaler 3 opens up a whole new world of possibilities… a fantastic gateway into harmony and composition.” -Daryl Bennett (Grammy-nominated composer) “Scaler 3 has evolved into a fully-fledged compositional toolkit. A triumph.” -Sound On Sound “Scaler 3 delivers the most comprehensive, powerful set of composition tools you can get.” -Attack Magazine “Scaler 3 takes everything that made Scaler 2 brilliant and makes it even better.” -The Sound Test Room Awards • KVR Readers Choice Awards - Winner 2025 • Plugin Boutique Awards - Best Music Theory Software 2025 • Sanjay C #1 Tool - Top Plugin of 2025 • #1 Music Theory App - Future Music Magazine 2024
StringVest
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An electronic music groovebox for your iPad or iPhone, that has everything you need to make a track in one app, all tied together in time and in key. 3 instruments to get you rocking with saveable session states so you can come back and start where you left off. 1. A classic take on the 303 bassline synth, with its own generative sequencer and drive control to get super squelchy 2. A great sounding Karplus Strong physical modelling synth, that goes from bass guitar, up to singing leads 3. A Cutdown 808 and Linn drum sounding drum machine, with preset patterns to get you going without any fuss A built in tape recorder to record your jam Mixer with built in dub delay when you want things to get a bit spacey! All functions exposed to midi learn, so you can control via a midi controller, plus midi in and out for the 3 instruments.
Screenshots
Verdict
The clearest difference is price: StringVest at $0.99 against Scaler 3's $12.99. StringVest also leads on device support (3 vs 1). Scaler 3's advantage is update cadence (fortnightly vs every 2 months). On ads, in-app purchases and iOS requirement 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
Scaler 3 costs $12.99 and StringVest $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Scaler 3 ships an update fortnightly, StringVest every 2 months. Both last shipped on October 25, 2026.
| Parameter | Scaler 3 | StringVest |
|---|---|---|
| Price | $12.99 | $0.99 — better |
| Rating | 4.7 (165 ratings) — better | — |
| Positive reviews | 56.7% of reviews | — |
| Number of ratings | 165 — better | — |
| Update frequency | Fortnightly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 1.1 GB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Scaler Music | Philip Vincent |
In-app purchases
Scaler 3
No in-app purchases
StringVest
No in-app purchases









