App Overview

Guitar Scales & Chords Power icon

Guitar Scales & Chords Power

Thomas Gunter · Music

To improve your guitar playing, learn scales, chords, and the relationship between them

$5.99 · In-app purchases

PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.8
92 ratings · Top 5%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
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Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
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Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

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Hypothesis: Contractors need faster repeat invoices more than more templates.

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Add more advanced scales and chords, possibly user-generated content.

Assumption to check: Limited content for advanced users

Validate with people who use this workflow before building.

Hypothesis 2

Clearer explanations and a trial period for premium features.

Assumption to check: In-app purchase confusion

Validate with people who use this workflow before building.

Hypothesis 3

Implement features for users to share tips and progress.

Assumption to check: No community features

Validate with people who use this workflow before building.

Hypothesis 4

Allow users to download scales and chords for offline use.

Assumption to check: Lack of offline access

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

To improve your guitar playing, learn scales, chords, and the relationship between them. Stay in tune with the tuner and enhance your rhythm by practicing with the metronome. Practice scale loops to master positions and develop muscle memory. Engage in scale exercises that will improve your finger dexterity and ability to improvise. Begin slowly and gradually increase your speed as you improve. Play scales and chords by swiping across the strings. The direction of the swipe determines whether the playback is ascending or descending. Tap on a note to play it. Scale positions correspond to the CAGED system, which consists of five patterns that cover the fretboard for each scale. The chord shape for each position is displayed to assist you in learning it in any key. The tuner offers a chromatic mode or the option to select from various tunings. The tuner and instruments use an adj. reference frequency, set to 410 Hz - 470 Hz (default A = 440 Hz). The Circle of Fifths displays common chords for a key, aiding in composing music, learning key signatures, and transposing songs to different keys. Metronome provides click and drum voices, beat subdivisions, and tap to set the BPM (10 - 400). Time signatures: 2/2, 1/4, 2/4, 3/4, 4/4, 5/4, 3/8, 6/8, 7/8, 9/8, and 12/8. Create PDF diagrams (color and black-and-white) of scale positions or all notes on a full fretboard, as well as diagrams of all chord notes on a full fretboard. These 8.5” x 11” PDFs are easy to print, save, and share. FEATURES: • Chromatic tuner • Scale position and exercise loops with adj. playback speed • Chord and scale information, including their compatibility • Chord/scale notes display letter, interval, and fingering • Chord/scale playback - choose from 5 instruments and set them independently • Count-in option before scale playback • Play scales and chords together to hear them in combination • 48 alternate tunings • Guitar display (vertical/horizontal and right/left-handed) • iPhone - zoom in/out to see the complete fretboard • iPad - 3 fretboards: full, scales, and chords • One-time purchase usable on iPhone, iPad, and iPod touch SCALES: Pentatonic etc: Major Pentatonic, Minor Pentatonic, Blues (Minor Blues), Major Blues Major modes: Ionian (Major), Dorian, Phrygian, Lydian, Mixolydian, Aeolian (Relative Minor) and Locrian Harmonic Minor modes: Harmonic Minor, Phrygian Dominant (Spanish Gypsy) Melodic Minor modes: Melodic Minor Ascending (Jazz Minor), Dorian b2 (Javanese), Lydian Augmented, Lydian Dominant (Overtone), Mixolydian b6 (Hindu), Locrian #2 (Half-Diminished), Super Locrian (Altered) Symmetrical: Chromatic, Half/Whole Diminished (Octatonic), Whole/Half Diminished, Whole Tone Miscellaneous: Bebop Dominant CHORDS: Major: Major, Major 7th (maj7), Major 9th (maj9), Major 13th (maj13), Major 6th (6), Major add9 (add9), and Major 6add9 (6/9) Minor: Minor (m), Minor 7th (m7), Minor 9th (m9), Minor 11th (m11), Minor 13th (m13), Minor 6th (m6), Minor Major 7th (m(maj7)), and Minor 7th b5th (m7b5) (Half-Diminished) Dominant: Dominant 7th (7), Dominant 9th (9), Dominant 11th (11), Dominant 13th (13), and Dominant 7th sus4th (7sus4) Altered Dominant: Dominant 7th b5th (7b5), Dominant 7th #5th (7#5), Dominant 7th b9th (7b9), and Dominant 7th #9th (7#9) Other: Augmented (aug), Diminished (dim), Diminished 7th (dim7), Perfect 5th (5) (Power Chord), Suspended 2nd (sus2), and Suspended 4th (sus4) TUNINGS: Standard, Std. Half Step Down, Std. Full Step Down, Drop D, Drop C#/Db, Drop C, Drop B, Drop A#/Bb, Drop A, Drop G#/Ab, Drop G, Drop F#/Gb, Drop F, Drop E, Double Drop D, Double Drop C#/Db, Double Drop C, Open A, Open A Alt., Open A Slide, Open C, Open D, Open E, Open F, Open G, Cross-note A, Cross-note A Alt., Cross-note C, Cross-note D, Cross-note E, Cross-note G, Asus4, Csus2, Dsus2, Dsus4 (Dad-Gad), Esus2, Esus4, Gsus2, Gsus4, E Modal, Bruce Palmer Modal, All Fourths, Baritone, C6, Dad-Gad (Dsus4), Dad-Dad, Dobro, Lute, New Standard

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SUGGESTED BUILD STACK
React Native
Expo
Zustand
axios
expo-av
BUILD KIT DIFFICULTY
Intermediate

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.