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
CityVsCity
City vs City makes it easy to compare any two locations in the United States—cities, suburbs, counties, and more
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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 included16 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 CityVsCity: map the core Lifestyle 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
Integrate more data sources for comprehensive insights.
Assumption to check: Limited city data availability.
Validate with people who use this workflow before building.
Hypothesis 2
Implement gamification features to motivate ongoing exploration.
Assumption to check: User engagement can decline after initial use.
Validate with people who use this workflow before building.
Hypothesis 3
Provide a more intuitive comparison feature.
Assumption to check: Difficulties in navigation between cities.
Validate with people who use this workflow before building.
Hypothesis 4
Utilize user preferences to suggest cities based on interests.
Assumption to check: Lack of personalized recommendations.
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
City vs City makes it easy to compare any two locations in the United States—cities, suburbs, counties, and more. Whether you’re planning a move, researching a job relocation, or just curious how places stack up, City vs City helps you make smarter decisions with clear, data-driven insights. Compare Thousands of U.S. Locations Search across cities, towns, counties, and metro areas nationwide. The app remembers your recent searches and lets you pin your home city for fast comparisons. Explore Dozens of Detailed Metrics Each comparison includes rich data across key categories: - Demographics - Weather & Climate - Crime & Safety - Tax Rates - Affordability & Housing - Employment & Economy - Health & Healthcare - Families & Lifestyle - Internet & Technology All displayed in beautifully designed, easy-to-read cards. Climate, Crime, Tax & Affordability Ratings Each category includes: - A simple 0–100 rating - Comparisons against state and national averages - Highlights for metrics that differ significantly See at a glance whether a city is safer, sunnier, cheaper, or more affordable. Know What Really Sets Cities Apart City vs City automatically highlights: - Metrics where one city strongly outperforms the other - Stats that differ sharply from national averages This makes it easy to spot meaningful differences—not just numbers on a page. Personalized Favorability Score Set your own preferences and the app generates an overall city score based on what matters most to you—cost of living, climate, safety, taxes, and more. Clean, Beautiful, Multi-Page Design Scroll through a full comparison view with intuitive charts, responsive layouts, and colorful category cards. Perfect for research, planning, or just exploring. Why People Love City vs City - Fast and accurate comparisons - Covers far more locations than typical “city comparison” tools - Clear visuals—no clutter - Great for movers, remote workers, students, retirees, and travelers - Simple, intuitive design Start exploring the country—one comparison at a time.
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
TypeScript
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.
