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
unrealBook Mobile
A micro-sized unrealBook for your retina iPhone!
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
80 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 included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 unrealBook Mobile: 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
Focus on partnerships with publishers for a wider range.
Assumption to check: Limited sheet music selection compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Streamline navigation and reduce UI elements.
Assumption to check: User interface can be cluttered.
Validate with people who use this workflow before building.
Hypothesis 3
Implement offline mode for downloaded music.
Assumption to check: No offline access for purchased music.
Validate with people who use this workflow before building.
Hypothesis 4
Add options for users to share music with friends.
Assumption to check: Lack of social sharing features.
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
A micro-sized unrealBook for your retina iPhone! Simple and portable! Carry your entire PDF library of charts with you to review on your iPhone. If you use unrealBook and have an iPhone, you definitely want this! Review your PDF charts on your iPhone. Reads set lists, indexes and more from unrealBook. Tap, swipe and zoom your way around your charts. This is a small but capable PDF music reader. A perfect add-on to unrealBook for the iPad! Features: View your music PDF files on your iPhone Scrolling Set List view Mark up your music with highlighter pens as well as regular pens Beautiful display of music in landscape mode with motion (auto-turn with linked files - beta) Supports display of unrealBook drawings Browse unrealBook set lists, bookmarks and indexes! Receive entire set lists and files from unrealBook via email or Airdrop Supports Airturn pedals (BT-105 and PED) and similar products Video out with rotation for display on a large monitor Link a song from your iTunes library or audio file to a chart Airdrop your PDF to other programs via iOS7/iOS8 Remote turn a connected iPad running unrealBook Download files from Dropbox Even more surprises! More coming.... this is just the beginning. This is a simpler version of unrealBook for the iPhone - it is not the same app as unrealBook for the iPad in terms of features, but it has some killer features of its own! Just like unrealBook for iPad, this app is made for you to add your own PDF files. It does not come with music PDFs.
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
Axios
react-navigation
react-native-pdf
expo-file-system
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.
