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
ParkSignal NYC
ParkSignal uses AI to read live NYC cameras — our own dedicated cameras plus public Department of Transportation feeds — and tells you which street parking spots are open before you even leave home
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
8 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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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 ParkSignal NYC: map the core Navigation 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 user-generated data to enhance accuracy.
Assumption to check: Limited availability of parking spots in real-time
Validate with people who use this workflow before building.
Hypothesis 2
Provide clear explanations of subscription benefits.
Assumption to check: In-app purchases may confuse some users
Validate with people who use this workflow before building.
Hypothesis 3
Refine GPS accuracy and data retrieval.
Assumption to check: Occasional inaccuracies in distance calculations
Validate with people who use this workflow before building.
Hypothesis 4
Enhance UI with a more modern and intuitive design.
Assumption to check: Poor user reviews regarding UI simplicity
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
ParkSignal uses AI to read live NYC cameras — our own dedicated cameras plus public Department of Transportation feeds — and tells you which street parking spots are open before you even leave home. Now 100% free for everyone. Patent Pending — U.S. patent application filed. WHAT IT DOES Every 20 seconds to 2 minutes, our own AI model analyzes each live camera and counts the open spots in every zone. Open the app, see what's free nearby, and head straight there — no more circling the block. WHAT'S NEW ParkSignal is now completely free — every feature, no subscription, no card Monitored zones are drawn right on each live feed, so you can see exactly which curb stretches we watch New ASP tab: every upcoming alternate-side suspension at a glance — including major holidays when meters are free too Live counts during alternate-side hours, so you can grab a spot right as ASP ends Tap any camera feed to go fullscreen and pinch to zoom Faster startup — spots appear automatically, no refresh needed HOW IT WORKS Live feeds from our own dedicated cameras and NYC DOT traffic cameras Our own AI model — trained on real NYC streets — counts open spots in real time Map view shows every location at a glance — green means spots are open "Looking for…" filter shows only the spot type you need: metered, free, or a specific alternate-side day Tap any camera to watch the live feed yourself and confirm Metered spots automatically count as free before 7am, after 7pm, and on Sundays COVERAGE Live in Manhattan today, with new cameras and neighborhoods added regularly — each one announced right inside the app. ALWAYS CHECK THE LIVE FEED AI is fast but not perfect — and it can be less accurate after dark (the app will tell you when). Always glance at the live camera image before driving over to confirm a spot is still open. PRICING Free. All of it — live spot detection, the ASP calendar, alternate-side reminders. No subscription, no card, no account. We cover the costs ourselves so you never have to. Privacy Policy: https://web-production-7bb46.up.railway.app/privacy
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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
@react-native-community/geolocation
react-query
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.
