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
CityMaps2Go Pro Offline Maps
CityMaps2Go is the ultimate offline map for travelers, mountain biking, and hiking enthusiasts who want to be prepared wherever they go
$11.99 · In-app purchases
PRICE
$11.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
1,647 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 CityMaps2Go Pro Offline Maps: 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
Ensure all features are fully functional offline.
Assumption to check: Limited offline functionality; some features require internet.
Validate with people who use this workflow before building.
Hypothesis 2
Provide clearer explanations of what users get with purchases.
Assumption to check: In-app purchases can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize map loading times and provide feedback to users.
Assumption to check: Occasional map loading issues.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to categorize or tag saved locations for easier access.
Assumption to check: Limited customization options for saved locations.
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
CityMaps2Go is the ultimate offline map for travelers, mountain biking, and hiking enthusiasts who want to be prepared wherever they go. Join the millions of users worldwide who trust CityMaps2Go! What others say about CityMaps2Go: “Essential app for travelers”, Time Magazine “One of the best offline maps apps”, WSJ “Maps without racking up roaming costs”, Macworld And here’s why millions of travelers and outdoor enthusiasts love CityMaps2Go: ▶ OPTIMIZED FOR OUTDOOR: CityMaps2Go includes detailed maps of remote areas and national parks. CityMaps2Go offers terrain maps with footpaths and contour lines online as well as offline. ▶ IN-DEPTH CONTENT: Unlike other offline map apps, CityMaps2Go features photos as well as tips and comprehensive in-depth info for millions of places. ▶ WORLDWIDE COVERAGE: CityMaps2Go covers the whole world. More than 150 countries, 60000 destinations, and 50 million places!! ▶ WORKS OFFLINE: CityMaps2Go works online and offline. Saving you from connectivity problems in national parks and remote areas and data roaming charges in foreign countries. ▶ PLAN TRIPS & TOURS: Plan tours with lists. Remember and save all the places you would like to visit. Create lists and have your travel ideas ready when you need them. ▶ DETAILED MAPS: Explore your saves on a detailed worldwide map. Navigate streets, footpaths, and bikeways wherever you are. ▶ SHARE WITH FRIENDS: Share your travel plans with your friends. Planning your trips or hike with others made easy with CityMaps2Go. ▶ SYNC BETWEEN ALL YOUR DEVICES: Create an user account and login from any of your devices. __________________________________________________ A note on battery life: We've spent years developing and improving the location technology that powers CityMaps2Go, making it extremely power efficient. But, as with all apps of this type, please note that continued use of GPS running in the background can significantly decrease battery life. We’d love to hear what it is you like about CityMaps2Go and how we can improve it for you. Drop us an email at [email protected] . Enjoy your travels and exciting outdoor tours … and don’t forget to send us a postcard.
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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
axios
react-navigation
expo-maps
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.
