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
iGigBook Mobile - Pocket Size
The ultimate pocket sized song reference for Musicians, Music Students and Educators has just got even better with the addition of chord charts that transpose! We've added an index to over 1,300 chord charts of Jazz ...
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.2
66 ratings · Top 30%
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 iGigBook Mobile - Pocket Size: 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 song database and integrate more sheet music sources.
Assumption to check: Limited song library and sheet music options
Validate with people who use this workflow before building.
Hypothesis 2
Implement better sorting, filtering, and search features.
Assumption to check: Difficulty in managing large set lists
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to download songs and sheet music for offline access.
Assumption to check: Inadequate offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Simplify navigation and enhance visual hierarchy.
Assumption to check: User interface can be cluttered
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
The ultimate pocket sized song reference for Musicians, Music Students and Educators has just got even better with the addition of chord charts that transpose! We've added an index to over 1,300 chord charts of Jazz standards that you can transpose to any key. Register and check for "Jazz Chord Charts - Transpose" in the Book List view. iGigBook Mobile provides indexes for over 70 fake books and real books, giving you the ability to quickly search for songs by title or composer. Load PDF books onto your device using iTunes, email or the web for quick and easy reference. iGigBook Mobile lets you find out which book a song is in, what page it is on and most importantly, you can view the page of the book on your device. Heading to the gig or rehearsal and can't remember what the melody to the tune is? Just use iGigBook Mobile to look up the song and display it with melody, chords and lyrics. Do you need to share your set list and sheet music with your band members? iGigBook Mobile lets you email your set list AND include a PDF attachment of all of the songs in the set list. NOTE: This is not an iPad App, it is designed for the small screen of an iPhone or iPod. * iGigBook Mobile DOES NOT INCLUDE ANY PDF BOOKS, IT ONLY PROVIDES THE INDEXES FOR THE BOOKS.
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
Advanced
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.
