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
Scrobbly - Last.fm Scrobbler
The Ultimate Apple Music Scrobbler
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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.
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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 Scrobbly - Last.fm Scrobbler: 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 a manual scrobble correction feature to enhance user control.
Assumption to check: Users often find scrobbling accuracy to be inconsistent.
Validate with people who use this workflow before building.
Hypothesis 2
Expand integrations with more music streaming services.
Assumption to check: Limited music source integration compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and improve the overall UI design.
Assumption to check: Some users find the UI to be cluttered and confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing options or a friend-following system.
Assumption to check: Lack of social features to connect with friends.
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
The Ultimate Apple Music Scrobbler Unlock the full potential of your listening history with Scrobbly, the premier Last.fm companion built exclusively for Apple Music. Scrobbly bridges the gap between your Apple Music library and your Last.fm profile with a stunning, modern interface and seamless background integration. Key Features Real-Time Live Activities: See your scrobble status instantly. Scrobbly uses Live Activities to track your Apple Music plays directly on your Lock Screen and Dynamic Island. Manual History Sync: Never miss a track. If you listened to music on other devices, easily scrobble manually by importing your Apple Music listening history directly into the app. Zen Mode Now Playing: Turn your iPhone into a digital record sleeve. Our "Zen Mode" removes all distractions, showing only high-resolution album art from your current Apple Music track. Keep Screen On: Perfect for your desk. Keep your device awake to display beautiful, full-screen artwork while your Apple Music playlist runs. Designed to feel like a native part of iOS, it provides the most reliable and aesthetic way to ensure every song you play in Apple Music counts toward your Last.fm stats.
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
React Navigation
React Query
TypeScript
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.
