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.
- Keep an editable draft if export fails.
App Overview
GtrLib Chords Pro
Explore the vast and comprehensive collection of guitar chords in GtrLib Chords Pro
$8.99 · In-app purchases
PRICE
$8.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
128 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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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
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.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for GtrLib Chords Pro: map the core Music workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Expand chord library with user-generated content.
Assumption to check: Limited chord variations compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline storage for chord diagrams.
Assumption to check: No offline access to chord diagrams.
Validate with people who use this workflow before building.
Hypothesis 3
Improve navigation with back buttons and breadcrumbs.
Assumption to check: Difficult navigation in chord detail view.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a freemium model with more accessible pricing.
Assumption to check: High price for premium content.
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
Explore the vast and comprehensive collection of guitar chords in GtrLib Chords Pro. Get all the possible positions of any chord throughout the fretboard along with its suggested fingering and audio demonstration. Use the built-in search to quickly get to any chord that you are looking for. GtrLib Chords is an invaluable tool in the pocket of any guitarist. • Vast and comprehensive chord library for guitar. • Includes suggested fingering for every chord. • Browse all the chords for every root note. • Explore all the inversions of a chord. • Change the root note with simple taps. • Search and quickly find any chord in any key. • Browse all the possible positions for every chord. • Search any chord directly using Spotlight. • Export any chord as a PNG image or MIDI file. • Includes a standalone app for Apple Watch. • VoiceOver support - makes the app accessible for users who are blind or have low vision. • Widgets - Quickly access recently viewed chords. • App Clips - Explore any chord in detail without having to install the complete app. • Includes support for Dark Mode. More on GtrLib Chords Pro for Apple Watch: GtrLib Chords Pro bundles a standalone app for Apple Watch and makes “most of the guitar chords you will ever need” accessible on the Apple Watch. You can quickly access any chord using just a few taps or using the context menu. Listen to any chord by just tapping on it.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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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.
