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
Police Lights: Led Strobe
Police Lights is a customizable LED flash simulator designed for visual simulation and entertainment use.
$2.99 · In-app purchases
PRICE
$2.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included15 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 Police Lights: Led Strobe: map the core Entertainment 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
Offer a wider range of colors and custom color mixing.
Assumption to check: Limited color options for strobe lights
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to upload their own sound effects for a personalized experience.
Assumption to check: No sound customization options
Validate with people who use this workflow before building.
Hypothesis 3
Enable users to share their strobe effects or settings with friends.
Assumption to check: No sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Include an onboarding tutorial to explain features and usage.
Assumption to check: Insufficient tutorial or guidance
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
Police Lights is a customizable LED flash simulator designed for visual simulation and entertainment use. Create immersive red, blue, white, and orange flashing light setups with multiple display layouts, LED styles, patterns, presets, and real-time controls. Build classic alternating patterns, fast strobes, pulse effects, quad rotations, sweep sequences, burst flashes, and randomized strobe setups with a clean full-screen experience. Features: • Full Screen, Split Screen, and Quad Screen modes • Dot LED, Matrix LED, and Square LED styles • Red, Blue, White, and Orange color combinations • Adjustable red, blue, white, and orange intensity controls • Adjustable flash frequency • Adjustable flip-flop speed • Adjustable LED size • Multiple built-in patterns including Steady, Blink, Double Blink, Triple Blink, Alt L/R, Alt T/B, Quad Rotate, Sweep, Pulse, Burst, Random, Flip-Flop, and Port Matrix • Quick Selection shortcuts for one-tap setup changes • Built-in presets for fast configuration • Save profiles for quick access • Display-only mode to hide the UI • Portrait and landscape support • Local preference saving • Privacy-friendly design with no account required Police Lights is built to deliver a smooth, high-visibility visual effect experience across modern iPhone screen sizes while keeping controls simple and fast to use. Important: Police Lights is intended for entertainment and visual simulation purposes only. It is not an official emergency tool and must not be used for traffic control, impersonation, or real-world emergency signaling. Flashing Lights Warning: This application contains bright flashing lights and rapid visual patterns that may not be suitable for people with photosensitive epilepsy, seizures, or light sensitivity. Stop using the app immediately if you experience discomfort, dizziness, or irritation. Privacy-Friendly: Your data stays on your device. No accounts, no cloud sync, no external servers. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy and Terms: Access our Privacy Policy and Terms and Conditions directly through the app or online. https://emkapps.com/police-lights-privacy-policy/ https://emkapps.com/police-lights-termsconditions/
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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
react-navigation
react-native-reanimated
expo-constants
react-native-gesture-handler
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.
