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
Shazam: Find Music & Concerts
"What's that song? Shazam will instantly identify music playing around you or in apps like TikTok, Instagram, YouTube & Snapchat
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
8,823,898 ratings · Top 5%
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.
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/
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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 Shazam: Find Music & Concerts: 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 an offline mode to cache recent identifications.
Assumption to check: Limited offline functionality for users wanting to identify songs without internet.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the subscription model and clarify benefits.
Assumption to check: In-app purchases can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance identification algorithm for better accuracy.
Assumption to check: Occasional inaccuracies in song identification.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a more seamless ad-free experience in premium tier.
Assumption to check: Ads in free version can disrupt user experience.
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
"What's that song? Shazam will instantly identify music playing around you or in apps like TikTok, Instagram, YouTube & Snapchat. Discover concerts near you, song lyrics, videos & more. With tens of millions of daily users, Shazam is trusted by music lovers worldwide. Shazam has thousands of five star reviews and is a top rated music app. ""Shazam is a gift... a game changer"" - Pharrell Williams, GQ ""I don't know how we ever survived before Shazam"" - Marshmello “Shazam is a kind of magic… You hear a song, hold your phone up like a wand and it tells you exactly what song it is, who sang it and lets you add it to your playlist or share it to your social media… How is that not magic?!” - Calum Scott WHY YOU'LL LOVE IT * Identify music in an instant. * Discover live shows near you from your favorite artists or through curated recommendations. * Recognize songs even when you're offline, using headphones or on a different app. * Revisit your music discovery history in your library anytime. * Get recommended songs and playlists similar to the music you’ve discovered. USE SHAZAM ANYWHERE, ANYTIME * Enable the Shazam widgets on your Lock Screen or Home Screen. * Ask Siri: “What’s this song?” to use Shazam hands-free. * Automate music discovery with the Shazam Shortcut in the Shortcuts app. CONNECT WITH YOUR MUSIC * Unlock extras from artists around the world. * Open any song directly in Apple Music, Spotify, Youtube Music, Amazon Music & Deezer. * Listen and add songs directly to your Apple Music playlists. * Watch music videos of the songs you discover in Apple Music or YouTube. * Follow along to songs with real-time, karaoke-style lyrics. * See what’s trending locally and globally with Shazam Charts. Optional App Permission ▪ Microphone: To identify a song that’s playing around you when you tap to Shazam. ▪ Location: To show you where your songs were identified, display upcoming events in your area, and improve the quality of the service. ▪ Notification: To send you notifications that are personalized based on your Shazam activity. You can use Shazam even without providing consent to any of the above optional app permissions. However, some features of the service may not be available. Availability and features may vary by country. For more information on Shazam's privacy practices, please read the Privacy Policy, available at: https://www.apple.com/legal/privacy/. Find out more and get support from AppleCare at: https://support.apple.com/guide/shazam/welcome"
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-async-storage/async-storage
expo-av
BUILD KIT DIFFICULTY
Advanced
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.
