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
PA Speed Calc
PA Speed Calc simply takes the speed limit and driver speed to calculate the dollar amounts for the various blocks on a Pennsylvania Traffic Citation when citing PA Title 75 (Vehicle Code) § 3362 Maximum Speeds
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.8
12 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 included15 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for PA Speed Calc: map the core Reference 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
Add advanced features like unit conversion and historical data analysis.
Assumption to check: Limited functionality compared to full-featured calculators
Validate with people who use this workflow before building.
Hypothesis 2
Modernize UI with a cleaner design and animations.
Assumption to check: User interface may feel outdated
Validate with people who use this workflow before building.
Hypothesis 3
Implement sharing features via social media or messaging.
Assumption to check: No sharing options for results
Validate with people who use this workflow before building.
Hypothesis 4
Consider a one-time purchase model for all features to improve user satisfaction.
Assumption to check: In-app purchases for basic 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
PA Speed Calc simply takes the speed limit and driver speed to calculate the dollar amounts for the various blocks on a Pennsylvania Traffic Citation when citing PA Title 75 (Vehicle Code) § 3362 Maximum Speeds. There is also a copy of § 3362 inside the application for reference while on a traffic stop. This app was developed by a Pennsylvania police officer. Turning the Double Fines switch ON doubles the FINE. Turning the Costs switch OFF makes COSTS $0.00. This would be used if you are issuing multiple traffic citations at the same time to one defendant and the speeding citation was not the one with the costs on it. If the end-user never goes into iPhone --> Settings --> PA Speed Calc to set the yearly costs for Pennsylvania Traffic Citations then it will default to $45.50 which is the amount for 2023. The end-user may change this value at any time for future years 2025, 2026, etc. Please use our support page to send us any feedback, suggestions, corrections, bugs, etc. Thank you and be safe out there!
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
react-navigation
react-native-reanimated
expo-constants
BUILD KIT DIFFICULTY
Starter
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.
