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
Spotify: Music and Podcasts
With the Spotify app, you can explore an extensive library of music and podcasts for free
Free · In-app purchases
OVERALL US RANK
#30
Free · all categories
REVENUE (Est)
$333K/mo
$194K - $472K
RATING
★ 4.8
42,157,822 ratings · Top 5%
Evidence scope: #30 is the current overall US Free chart position. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
Build your own version
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 Spotify: Music and Podcasts: 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
Offer more features for free users to enhance engagement.
Assumption to check: Limited functionality in free tier
Validate with people who use this workflow before building.
Hypothesis 2
Simplify onboarding and navigation experience.
Assumption to check: Complex navigation for new users
Validate with people who use this workflow before building.
Hypothesis 3
Implement better personalization algorithms.
Assumption to check: Algorithmic playlist generation can be hit or miss
Validate with people who use this workflow before building.
Hypothesis 4
Provide more efficient streaming options and lower quality settings.
Assumption to check: High data usage for streaming
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
With the Spotify app, you can explore an extensive library of music and podcasts for free. Curate the best playlists and stream millions of free songs, albums, and original podcasts on your phone or tablet. Subscribe to Spotify Premium to download and listen offline wherever you are, and unlock our catalog of audiobooks. Why choose Spotify as your go-to music and podcast app? Here, you can: • Listen to over 100 million songs and 6 million podcast titles • Explore our selection of specially-crafted artist playlists • Easily search for your favorite songs, albums, artists, and podcasts • Discover personalized music recommendations tailored to your unique taste • Subscribe to your favorite free podcasts so you never miss an episode, and even curate your own podcast library Spotify Free is more than a music player - find the sounds you love and stream music and podcasts online, for free. Enjoy personalized playlists or curate and share your own, discover the hottest new releases, explore upcoming events from your favorites, and more. • Stream millions of free songs and podcasts • Create playlists with your favorite music • Share songs and playlists with friends and family (feature restrictions may apply in some regions) • Discover personalized playlists made just for you, and collaborate on playlists with your friends • Enjoy your personal Discover Weekly playlist every week • Stay in the know with the Release Radar and New Music Friday playlists • Find nearby events and gigs by your favorite artists • See your most played songs, genres, artists, and more with yearly Spotify Wrapped • Stream music across your devices with Spotify • Use Spotify Connect and enjoy listening on smart speakers, desktop, laptop, smart TV, Chromecast, PlayStation®, Xbox®, smartwatch, in your car, and more - limited number of device models apply Spotify Premium - a great way to enjoy the benefits of an offline music player, and stream music without WiFi. By pressing download, you can access your songs, playlists, podcasts, and audiobooks offline, wherever you are. • Listen to music, podcasts, and audiobooks - all in one place • Ad-free music listening: enjoy your music with no ad interruptions • Enjoy full on-demand playback • Audiobooks in Premium are currently available in the US, UK, Australia, Ireland, New Zealand, and Canada. Discover 250,000+ audiobook titles with 15 hours/month of available listening for Premium Individual subscribers and Duo & Family plan managers. • Superior sound quality on supported devices • AI DJ: a personalized guide that knows your music taste so well it can choose what to play for you • Enjoy on desktop, phone, tablet, computer, smartwatch, and in your car • Listen and control the listening session together by hosting a Jam in real time with friends • Download songs, podcasts, and audiobooks for offline listening, without an internet connection • No contract required - cancel your subscription whenever you want Spotify lets you play music wherever you are. Listen to your favorite songs and discover new music, podcasts, and audiobooks with the Spotify app! LOVE SPOTIFY? Follow us on Instagram: https://www.instagram.com/spotify Follow us on TikTok: https://www.tiktok.com/@spotify
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
Axios
React Navigation
expo-av
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.
