# Sustain Six: Guitar Trainer — Fretboard, chords and drills > Interactive guitar fretboard, chords, scales, and practice drills for learning. (iPhone/iPad app by Mark Acosta.) - Source: https://appshunter.io/ios/app/sustain-six-guitar-trainer/id6792376510 (this page in markdown: same URL + `.md`) - Developer: [Mark Acosta](https://appshunter.io/developer/6792376512) - Category: Education, Music - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 15.0 · 39 MB - Languages: American English - Released: 2026-09-05 - Data updated: 2026-10-14 - Monetization: free ## What is Sustain Six? Sustain Six turns the fretboard into something you can see, hear, and master. Explore every note, chord, scale, and arpeggio on an interactive fretboard with real guitar audio. Learn the patterns that connect the whole neck: CAGED shapes, pentatonic boxes, three-notes-per-string scales, and triads. Drill your knowledge, track your practice, and watch your progress build week over week. WHAT'S INSIDE - Interactive fretboard explorer: notes, intervals, and scale degrees on every string - Chords: voicings across the neck, with audio playback and strumming patterns - Scales and arpeggios: CAGED positions, pentatonic boxes, 3NPS patterns - Circle of fifths, tuner, and metronome built in - Drills that quiz you on the fretboard, and practice tracking with streaks and personal bests - Real sampled guitar tones, acoustic and electric Start free, no account required. Create a free account to save your progress across devices. ## Key features - Interactive fretboard explorer - Chord voicings with audio - Scale and arpeggio patterns - Circle of fifths and tuner - Practice drills and progress tracking - Real guitar audio samples ## Is Sustain Six safe? Not enough ratings yet to assess Sustain Six. ## Is Sustain Six legit? Sustain Six: Guitar Trainer has limited verification signals. The AppsHunter Legitimacy Score for Sustain Six is 58 out of 100 points across 7 verification signals from App Store and developer data. ## Frequently asked questions about Sustain Six ### What is Sustain Six? Sustain Six is an educational app designed to help users master the guitar fretboard. It features an interactive fretboard explorer, chord and scale visualizations, and practice drills with real guitar audio. ### What learning methods does Sustain Six use? Sustain Six utilizes visual learning through its interactive fretboard, auditory learning with real guitar audio playback for chords and scales, and kinesthetic learning through practice drills and pattern recognition. ### How does Sustain Six track progress? Sustain Six allows users to track their practice sessions, monitor streaks, and achieve personal bests. Creating a free account enables saving progress across devices. ### Is Sustain Six suitable for beginners? Yes, Sustain Six is suitable for beginners as it provides a clear visualization of notes, chords, and scales on the fretboard, along with drills to reinforce learning. ### What devices does Sustain Six support? Sustain Six is available on iPhone, iPad, and iPod, as indicated by its supported devices list. ### What is the age rating for Sustain Six? Sustain Six has an age rating of 4+, making it appropriate for a wide range of users. ### How often is Sustain Six updated? The latest version of Sustain Six is 1.0.4, and it was last updated on October 11, 2026, suggesting regular updates from the developer. ### Does Sustain Six have ads? No, Sustain Six does not contain advertisements, as indicated by the 'hasAds' flag being false. ## Version history (last 5 releases) ### 1.0.4 — 2026-10-11 The Progressions page now links to a list of well-known songs grouped by chord progression. ### 1.0.3 — 2026-10-04 Chord Explorer cards now draw chords the right way round, with each note at its correct fret. Picking a root in the Chord Explorer keeps you on the Chord Explorer. The tuner now tells you when it can't find or open your mic, and shows the right direction to tune a very flat string. The Intervals drill plays each note from the string shown on screen. Note names are now spelled the same way across screens. ### 1.0.2 — 2026-09-27 Accuracy update. We checked every scale, chord, CAGED shape, drill and lesson against music theory and fixed what was wrong. - Chord diagrams now read low E on the left, like a real chord chart. - Notes and degrees are spelled right in every key (Bb major, not A# major). - CAGED shapes, pentatonic boxes and 3NPS patterns sit in the right place with the right fingers. - Drills, lessons and the tuner give the right answers. - Standard-tuning shapes are hidden on alternate tunings. ### 1.0.1 — 2026-09-16 Fixes a bug where recording on the Practice page could silence all app audio on iPhone until the app was relaunched. Progression cards now show the key's mode (for example A Minor), and transposed chords are spelled correctly in flat keys. ### 1.0 — 2026-09-05 No release notes. ## Apps similar to Sustain Six | App | Rating | Price | Category | | --- | --- | --- | --- | | [Tonic: Learn Guitar Fretboard](https://appshunter.io/ios/app/tonic-learn-guitar-fretboard/id6800801337) | — | Free | Education | | [Fretsy: Guitar Neck Trainer](https://appshunter.io/ios/app/fretsy-guitar-neck-trainer/id6795698379) | — | Free | Education | | [Guitarr - Guitar Theory Easy](https://appshunter.io/ios/app/guitarr-guitar-theory-easy/id6758998786) | — | Free | Education | | [Guitar Practice Room](https://appshunter.io/ios/app/guitar-practice-room/id6788635183) | — | Free | Education | | [Garden Growing](https://appshunter.io/ios/app/garden-growing/id6443476418) | 3.5 (8) | Free | Education | | [NGSL English Flash Card](https://appshunter.io/ios/app/ngsl-english-flash-card/id6477330552) | — | Free | Education | ## Related topics [guitar trainer chords](https://appshunter.io/ios/topics/guitar-trainer-chords) --- *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 2026-10-14.*