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
parkken
parkken is a one-of-a-kind Map and App that translates and simplifies into simple graphics or plain English the Manhattan parking rules for any time and place you request
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.0
2 ratings · Below Average
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 parkken: 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 real-time availability tracking.
Assumption to check: Difficult to find available parking spots
Validate with people who use this workflow before building.
Hypothesis 2
Create a more visually appealing and user-friendly design.
Assumption to check: Poor user interface and experience
Validate with people who use this workflow before building.
Hypothesis 3
Add offline maps for users to access parking information without internet.
Assumption to check: Lack of offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Integrate user reviews and ratings for parking spots.
Assumption to check: Inaccurate parking information
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
parkken is a one-of-a-kind Map and App that translates and simplifies into simple graphics or plain English the Manhattan parking rules for any time and place you request. Simply fill in the “CAN I PARK HERE?" Query dialog and the parkken App scans the majority parking rules for the block at the hour and address selected by you. It displays a Parking Gauge graphic that shows a quick Yes, No, or Soon picture of legal parking allowed. The Area Gauges show multiple Parking Gauge readouts for surrounding blocks. This new version's (3.10.87) CAN I PARK HERE?, Parking Gauge, and Text queries as well as Area Gauges have been updated to interpret restored parking rules after Covid. The signs on the block are once again the rule.. The Base Map and its Clock Symbols will continue to interpret non-commercial parking rules for an overall view. The app also includes locations for pay garages and lots, as needed. A pilot program for garage savings coupons is underway. The App has a GPS button that will orient the map to your location and a Favorites function for storing Quick Links to your favorite neighborhoods. An Alternate Side Suspension Days Calendar page shows you days you don't have to move your car for street sweeping. For more info go to parkken.com.
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
axios
zustand
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.
