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
Music Finder: Song Identifier
Music Finder will help you to find songs playing around you in few seconds and discover new songs and artists
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.9
996 ratings · Top 50%
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 Music Finder: Song Identifier: 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
Music Finder will help you to find songs playing around you in few seconds and discover new songs and artists. Just open the app, tap identify and let Music Finder app identify the song playing. You can also check song lyrics and learn music stats at the same time. Features: - Dynamic Lyrics: Delivers real-time lyrics directly to your lock screen, Dynamic Island, widgets, and floating windows. Dynamic lyrics are fully compatible with Apple Music and Spotify - Lyrics Widget: View real-time lyrics on your lockscreen with our song lyrics widget - Carplay Lyrics: Enjoy lyrics on the go with Carplay lyrics vehicle display You can identify new songs by sound and music lyrics. If you remember only part of a song lyrics, go to search and type the lyrics you remember and Music Finder will find the song for you. Identify new songs and save/share it anytime. You can also play the part of a song directly from Music Finder app. Don’t forget to check top charts to see which songs are popular in different countries. Connect with your Apple Music account to simply sync with Music Finder. New songs you identify will be transferred to your playlists on Apple Music if you want to. This will help you to easily create new playlists from the songs you identified using Music Finder app. Apple Music top charts will help you to find trending songs worldwide. You can identify many songs with Music Finder. Music Finder works very similar to other apps like Shazam and SoundHound. Find songs by humming with Music Finder! Name any song in seconds with the latest Music Finder and Song Identifier app and identify songs by humming. Never miss a trending song our a song that you listen for the first time. Simply add it to your Apple Music playlist without any effort and enjoy the new way of discovering popular music with the best music recognition app. Music Finder app uses the latest song identifier model like Shazam and helps you to discover new songs. Become a Music Finder Pro member by purchasing a premium subscription. As a Pro member, you can unlock and enjoy unlimited features. Do you have any questions about Music Finder app? We love receiving your feedback. You can reach us from: [email protected] You can find terms and privacy links of Music Finder in here: https://www.virals.app/terms https://www.virals.app/privacy
Written user reviews are not shown here. Check current App Store reviews >
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 advanced algorithms for better recognition.
Assumption to check: Limited song identification accuracy
Validate with people who use this workflow before building.
Hypothesis 2
Create a polished and cohesive UI across all screens.
Assumption to check: Inconsistent user interface
Validate with people who use this workflow before building.
Hypothesis 3
Offer more free identifications or a better trial experience.
Assumption to check: Limited free usage
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to edit or delete individual song history entries.
Assumption to check: Poor history management
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
Zustand
axios
expo-av
react-navigation
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.
