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
PayByPhone Parking
PayByPhone is a global leader in mobile parking payments
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
758,532 ratings · Top 5%
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/
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 PayByPhone Parking: map the core Travel 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 faster payment gateway and instant confirmation.
Assumption to check: Users often face issues with payment processing delays.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate more parking partners for better coverage.
Assumption to check: Limited parking spot availability in certain locations.
Validate with people who use this workflow before building.
Hypothesis 3
Provide in-app chat support for quicker resolutions.
Assumption to check: Inadequate customer support response times.
Validate with people who use this workflow before building.
Hypothesis 4
Add a real-time availability indicator on the map.
Assumption to check: Difficulties in finding parking spots during peak hours.
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
PayByPhone is a global leader in mobile parking payments. More than 95 million drivers worldwide have trusted us with their payments to date. We simplify journeys for millions with smart, intuitive technology and user-focused features. Available in 11 languages, our app is used across more than 1,300 locations -including cities and private operators - in the UK, North America, France, Germany, and Switzerland. With the PayByPhone app, we help parking to be quick, seamless, and secure. Just enter or scan the location code, choose your duration, and pay using your preferred payment method - all from your phone. It’s all designed to simplify your journey, so you can focus on what matters most. Key features: Start and extend parking sessions remotely See active sessions at a glance with the Today View widget Use Maps or Nearby to find available parking Get SMS or push notifications before your session expires Review your parking history and past sessions Pin your parking location to easily find your vehicle Receive emailed receipts for expense tracking Pay with credit/debit card, Google Pay, Apple Pay, or PayPal (where available)
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
Zustand
Axios
react-navigation
@react-native-community/async-storage
BUILD KIT DIFFICULTY
Expert
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.
