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
Urban Chord Studio
Break writer's block instantly with Urban Chord Studio.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 Urban Chord Studio: 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
Integrate a community feature for users to share and discover new chords.
Assumption to check: Limited chord options and user-generated content
Validate with people who use this workflow before building.
Hypothesis 2
Enable offline access to allow users to work without internet.
Assumption to check: No offline access to saved projects
Validate with people who use this workflow before building.
Hypothesis 3
Implement visual indicators for chord transitions.
Assumption to check: Lack of visual feedback for chord changes
Validate with people who use this workflow before building.
Hypothesis 4
Add an onboarding tutorial for new users.
Assumption to check: No tutorial or help section
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
Break writer's block instantly with Urban Chord Studio. Urban Chord Studio is the ultimate songwriting companion for producers, musicians, and beatmakers. Whether you are looking for a soulful R&B vibe, a dark Trap mood, or a complex Jazz progression, Urban Chord Studio generates professional harmonies in seconds, no music theory required. WHY URBAN CHORD STUDIO? Stop staring at a blank project. Select a genre, explore variations, and find the perfect emotional landscape for your next song. Focus purely on harmony and mood without the distraction of complex drum patterns. KEY FEATURES: 20+ Music Genres: Explore curated progressions for Lo-Fi, Neo-Soul, Trap, Jazz, Cinematic, Pop, Rock, and many more. Advanced Chord Voicings: Instantly access complex chords (7ths, 9ths, 13ths) that sound professional and rich. Atmospheric Sound Engine: Play your chords with high-quality internal synth tones, including lush Pads, Strings, Bass, and Leads. Performance Modes: Switch between Block chords, Arpeggiators, and Strumming modes to hear how the progression flows. Customizable Ambience: Control the Reverb (Space) and BPM to set the perfect atmosphere for your session. Intuitive Interface: A retro-futuristic VFD style design that puts creativity first. PERFECT FOR: Finding inspiration for melodies. Creating backing tracks for improvisation. Learning how different genres use harmony. Sketching song ideas on the go. Unlock your creativity. Download Urban Chord Studio and start writing your next hit today.
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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
Zustand
Supabase
React Navigation
React Native Audio
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.
