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
Vinyl Speed
Vinyl Speed is the essential companion for any vinyl enthusiast seeking perfect playback
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included16 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 Vinyl Speed: map the core Music workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
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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 AI-driven recommendations based on user listening habits.
Assumption to check: Apps in the music category often lack personalized recommendations.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce better sorting and filtering options for playlists and songs.
Assumption to check: Users find it difficult to manage large libraries.
Validate with people who use this workflow before building.
Hypothesis 3
Make controls larger with more visible icons.
Assumption to check: Playback controls can be unintuitive.
Validate with people who use this workflow before building.
Hypothesis 4
Add options for sharing playlists and songs on social media.
Assumption to check: Limited social sharing features.
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
Vinyl Speed is the essential companion for any vinyl enthusiast seeking perfect playback. It transforms your iPhone into a high-precision tool that measures your turntable's rotational speed. Vinyl records sound their best when played at the exact right speed. Even minor deviations can alter pitch, tempo, and the listening experience. With Vinyl Speed, you can easily verify your turntable is spinning at precisely 33⅓, 45, or 78 RPM. FEATURES - Accurately measures turntable speed to two decimal places using your device's advanced motion sensors - Support for all standard vinyl playback speeds: 33⅓, 45, and 78 RPM - Choose between 15 or 30-second tests for different precision needs - 5-second countdown gives you time to place your device properly on the platter - Detailed analysis showing measured speed, deviation percentage, and accuracy rating - Real-time monitoring of rotational consistency to identify fluctuations - Receive practical suggestions when speed issues are detected - Save and review past measurements with custom notes to track adjustments over time No external hardware needed—just place your iPhone on your turntable platter and start measuring.
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/native
expo-av
react-native-reanimated
BUILD KIT DIFFICULTY
Intermediate
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.
