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
Deezer: Music Player, Podcast
Deezer is more than just a music platform.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
36,839 ratings · Top 15%
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 Deezer: Music Player, Podcast: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Deezer is more than just a music platform. It’s a fully personalized listening experience that adapts to you. Deezer is where you can embrace your tastes, turn up the volume, and Live the Music. With a Deezer Premium plan, you'll get everything you need in one app: Music you love, made for you • A massive global catalog with all the tracks you could ever want • Flow, your infinite, personalized mix of favorites and discoveries • Smart recommendations that perfectly match your vibe • Control your music discovery with simple, transparent algorithm controls • Discover curated playlists for every mood, genre, or season • Explore Audiobooks*, Radios*, and our growing Podcast catalog, with personalized picks based on your listening Fun and interactive features • Deezer Club gives you the chance to win tickets to attend exclusive live events • Shaker lets you mix playlists with friends and compare your tastes • Music Quiz tests your music knowledge, play solo or with friends • SongCatcher helps you find any song playing around you Customization at your fingertips • Coming from another music app? Quickly bring all your music to Deezer with Transfer My Music • Shape your algorithm to find more of the music you love • Create playlists for every mood, genre, or moment and customize the covers • Reorganize your Homepage and Library to put your top picks front and center • Share any song or playlist, even with people who don't use Deezer • Dive deeper with on-screen Lyrics and translations And of course, the essentials • Ad-free listening • Offline mode lets you download your favorite albums, playlists, and podcasts for when you're low on service • Unlimited skips and on-demand listening • Enjoy HiFi sound for lossless listening that's built for audiophiles Choose your plan: • Deezer Premium – One Premium account with all our features • Deezer Duo – Two Premium accounts, one subscription • Deezer Family – Up to 6 Premium accounts with kid-friendly profiles • Deezer Student – Get all the benefits of Deezer Premium for half the price • Deezer Free* - Full access to our catalog, with occasional ads and limited features Take Deezer anywhere Connect your music to all your favorite devices, at home and on the go: • Smart speakers like Alexa, HomePod Mini & Sonos for an easy smart home music setup • On your wrist — Launch the Deezer app on your Apple Watch, Fitbit, or any Wear OS device and listen to your favorite tracks wherever you go • In your car with Automotive OS for a powerful in-car audio player Follow us: Instagram: instagram.com/deezer Facebook: facebook.com/deezer X: x.com/deezer Privacy policy Terms of use https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ *Some features and plans may not be available in all countries.
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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
Ensure robust offline support with easy download features.
Assumption to check: Limited offline playback options
Validate with people who use this workflow before building.
Hypothesis 2
Implement better algorithms for personalized playlists.
Assumption to check: Inconsistent music recommendations
Validate with people who use this workflow before building.
Hypothesis 3
Provide a more user-friendly ad experience or alternative free features.
Assumption to check: Ad interruptions in free tier
Validate with people who use this workflow before building.
Hypothesis 4
Enhance sharing options to popular social media platforms.
Assumption to check: Limited social sharing capabilities
Validate with people who use this workflow before building.
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
Redux
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.
