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
Tap DJ - Mix & Scratch Music
Tap DJ is the ultimate pocket DJ app for iPhone and iPod!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.5
306 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 included17 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 Tap DJ - Mix & Scratch Music: 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 robust music library integration with popular streaming services.
Assumption to check: Limited track library that may frustrate users
Validate with people who use this workflow before building.
Hypothesis 2
Focus on optimizing audio playback stability and performance.
Assumption to check: Occasional crashes during playback
Validate with people who use this workflow before building.
Hypothesis 3
Provide an onboarding tutorial to guide new users through the features.
Assumption to check: User interface can be confusing for new users
Validate with people who use this workflow before building.
Hypothesis 4
Add features for users to share their mixes on social media.
Assumption to check: Lack of 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
Tap DJ is the ultimate pocket DJ app for iPhone and iPod! Scratch, Mix, and add FX to your music! Load up your favorite track, or choose from the preloaded sample library. Then get DJ-ing! Tap DJ has it all: * Integrated iTunes Library Access * FX, and 3-Band Equalizer for each Deck * Integrated 9 Pad Sampler * 3 Loopable Cue Points per Deck * Record your mixes * Voice Recording * GyroScratch™ Technology * 3 Included Skins * Import tracks from USB, or WiFi, or iPod * Discover new music by viewing top mixes * Stunning realistic turntable interface * Live waveform views for precise mixing Tap DJ is a great app whether you're a beginner or a pro. Tap DJ has many features found in desktop DJ apps that can cost as much as $50 If you like the app, please leave us a review! For demo videos, and more info, visit http://tap.dj If you have a feature request, please email us at [email protected] For the latest updates about Tap DJ, follow us on twitter @laanlabs
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
@react-navigation/native
react-native-sound
zustand
@expo/av
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.
