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
FretLedger: Guitar Tracker
FretLedger is the guitar log built for players who care about their instruments
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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 included17 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 FretLedger: Guitar Tracker: 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
Implement graphical representations like charts or progress bars.
Assumption to check: Users find it hard to visualize their practice progress over time.
Validate with people who use this workflow before building.
Hypothesis 2
Add features for sharing practice logs or tips with friends.
Assumption to check: Lack of social features to connect with other guitarists.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to create custom practice plans or routines.
Assumption to check: Limited personalization options for practice routines.
Validate with people who use this workflow before building.
Hypothesis 4
Provide clear explanations of premium features and benefits.
Assumption to check: In-app purchases may confuse users regarding the value.
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
FretLedger is the guitar log built for players who care about their instruments. Track every guitar, bass, banjo, mandolin, or ukulele you own with a level of detail that no other app comes close to. YOUR COLLECTION, FULLY DOCUMENTED Record make, model, year, serial number, construction details, and photos for every instrument. Log tuning, string gauges, pickup configuration, and wiring for each one. Search and sort your whole collection in seconds. STRING TRACKING THAT ACTUALLY WORKS Set a restring interval for each guitar and FretLedger flags overdue strings automatically. Log brand, gauge, and string type every time you restring. Keep a string inventory to track what packs you have on hand, spot gaps before a gig, and add what you need straight to your shopping list. COMPLETE SERVICE HISTORY Record every setup, truss rod adjustment, fret dress, pickup swap, and luthier visit. Track parts used, costs, and the settings you dialled in. Flag issues as they come up so nothing gets forgotten before the next service. WIRING AND PICKUP DOCUMENTATION Choose from 40 templates covering Stratocaster, Telecaster, Les Paul, Jazzmaster, Gretsch, and more. Document every control, pot value, and coil split. Track your pickup inventory including stored pickups you plan to reinstall. SHARE AND BACK UP WITH CONFIDENCE Export a branded Guitar Passport PDF to share with a buyer. Send individual guitars or your whole collection as a .fretledger file via AirDrop or Mail. Automatic daily backups keep your data safe across app updates. No subscription. No account. No cloud. Everything stays on your device.
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.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
Zustand
React Navigation
React Native Paper
BUILD KIT DIFFICULTY
Starter
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.
