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
SongShift
Dissatisfied with your music provider or want to try something new?
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
67,205 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/
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 SongShift: 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
Dissatisfied with your music provider or want to try something new? SongShift transfers the music you love to the music provider you want. Shift your favorite albums, playlists, and songs with a few taps. How it works: - Connect your music services - Configure which music you'd like to transfer - SongShift finds suitable matches - Confirm our song matches and fix any we may have gotten wrong - The rest is magic. Sit back and let SongShift transfer your music *** Supported Services: - Apple Music * Requires an active Apple Music subscription for transferring into - Amazon Music - Audiomack - Discogs - HypeMachine - LastFM - Napster - Pandora - Qobuz - SoundCloud - Spotify - TIDAL - YouTube *** Key Features: - Quickly Shift your favorite music between services - Match review makes it a breeze to transfer the exact music you want - Add many transfers to the queue with batch setup - Add new Shifts using a web link copied to the clipboard - Monitor playlists for new song additions to keep your transferred playlists up to date - Clean minimal design with intuitive features to enhance your experience *** If you have any issues with SongShift, please let us know at [email protected]. We'll be happy to assist in any way we can. SongShift’s Terms & Conditions are available at https://songshift.com/terms.
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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
Expand supported services to include more popular platforms.
Assumption to check: Limited music service support leading to user frustration
Validate with people who use this workflow before building.
Hypothesis 2
Implement retry logic and notifications for users.
Assumption to check: Transfer failures due to rate limits on services
Validate with people who use this workflow before building.
Hypothesis 3
Create a guided onboarding experience to improve usability.
Assumption to check: Confusing UI for first-time users
Validate with people who use this workflow before building.
Hypothesis 4
Optimize transfer processes and provide user feedback during transfers.
Assumption to check: Inconsistent transfer speeds
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
Supabase
React Navigation
Axios
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.
