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
Skratch It
・Transform your iPhone and iPad into a portable DJ set designed for the art of scratching・
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
27 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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Combine features and design from your favorite apps.
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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/
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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 Skratch It: 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
Provide a wider range of free sounds and effects to enhance user creativity.
Assumption to check: Limited sound samples and effects available for free.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a guided tutorial for new users to familiarize them with the features.
Assumption to check: Complexity of the mixing interface can be overwhelming for new users.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize the audio processing to improve performance on lower-end devices.
Assumption to check: Performance issues when handling multiple tracks and effects simultaneously.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a more subtle and user-friendly paywall experience.
Assumption to check: In-app purchase prompts can be disruptive.
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
・Transform your iPhone and iPad into a portable DJ set designed for the art of scratching・ We’re excited to bring you an app that redefines the possibilities of dj scratching with a single hand-held device, ready to be used on the go, anywhere you want. Skratch it! transforms your iOS device into mobile turntable / mixer / loop player combo, allowing you to instantly experience limitless possibilities right at your fingertips. ・Seamless scratch experience・ Thanks to the implementation of a highly responsive virtual deck and a semi-automated mixer’s crossfader, it is possible to achieve both precision and finesse of performance even for beginners. The mixer section offers eight, carefully selected, crossfader movement patterns that are automatically synced with the tempo of background music playback. These can be easily combined together by the swipe gestures, allowing to create endless combinations of the scratching sounds. The app comes with a selection of six different sound sets, containing most of the all-time classic samples together with some fresh beeps, squelches and rough noises! Eager to cut and bend your own sounds? Importing custom samples is also possible. ・Packed with useful features・ - Dope selection of background music tracks (80 - 140 bpm) - 6 pads for switching between different scratching sounds sets - Mixer unit with pattern-driven tempo-synced and manual modes of the crossfader - Responsive, large, virtual deck with triggers for performing “stab” and “faderless” tricks - Possibility to cue and trigger selected part of the record - 4 different DSP effects - Live recording to WAV (record your performance with or without the background music) - Importing of custom samples (44.1khz, stereo, 16-bit WAV files) - Tap tempo button for fast tweaking of the playback speed - Audio routing (audio output from the app can be routed to another app that supports IAA) - Built-in tutorial - Hours of fun and engaging experience!
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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
Zustand
React Native Gesture Handler
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.
