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
YouTube Music
Connecting you to the world of music:
Free · In-app purchases
OVERALL US RANK
#16
Grossing · all categories
REVENUE (Est)
$1.4M/mo
$839K - $2.0M
RATING
★ 4.8
1,515,276 ratings · Top 5%
Evidence scope: #16 is the current overall US Grossing chart position. 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 YouTube Music: 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 a robust offline mode with better caching.
Assumption to check: Limited offline listening capabilities.
Validate with people who use this workflow before building.
Hypothesis 2
Create an ad-free subscription tier.
Assumption to check: Ads can interrupt the listening experience.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance algorithm for music recommendations based on user behavior.
Assumption to check: Lack of personalized recommendations.
Validate with people who use this workflow before building.
Hypothesis 4
Design an onboarding tutorial for first-time users.
Assumption to check: Difficult navigation for new users.
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
Connecting you to the world of music: ● Music content including live performances, covers, remixes and music content you can’t find elsewhere ● Thousands of curated playlist across many genres and activities Get personalized music, perfect for every moment: ● Personalized playlists and Mixes ● Activity mixes made for you ● Create playlists with song suggestions or collaborate with other music fans to create the perfect playlist ● Neatly organized Library to see all of your liked and added songs, playlists you created, and artists you subscribed to Stay on top of the trend and discover new music: ● Check out new releases ● Discover music based genres (Hip Hop, Pop, Country, Dance & Electronic, Blues, Indie & Alternative, Jazz, Kpop, Latin, Rock, and more) ● Discover music based mood (Chill, Feel Good, Energy Booster, Sleep, Focus, Romance, Workout, Commute, Party) ● Explore top charts from all over the world Enhanced your listening experience with unique features: ● Song lyrics so you can sing along to your favorites ● Upload songs from your devices so you can enjoy them in one place with YouTube Music ● Listen on your phone, desktop, smart speaker, smart TV, car, smart watch and within your favorite apps. ● Compatible with Google Maps, Waze, Google Assistant, and more. Upgrade to Music Premium (available in select countries) to enjoy: ● Listen to music ad-free ● Play music in the background ● Switch seamlessly between song audio and music videos, only with YouTube Music ------------ If you subscribe via iTunes: Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Accounts will be charged for renewal within 24 hours prior to the end of the current period at the rate of the selected plan. Subscriptions and auto-renewal may be managed by going to Account Settings after purchase. YouTube paid service terms: https://www.youtube.com/t/terms_paidservice Privacy policy: https://www.google.com/policies/privacy
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
react-navigation
axios
BUILD KIT DIFFICULTY
Expert
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.
