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
Cruise Nav
Ever wondered where you are at sea, how fast you’re going, how far until the next port of call, or how many hours remain on your journey? Cruise Nav gives you the answers—right from your phone.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.0
1 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Cruise Nav: 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
Optimize performance and improve loading times.
Assumption to check: Poor user experience due to slow loading times and crashes.
Validate with people who use this workflow before building.
Hypothesis 2
Add more features like offline maps and real-time traffic updates.
Assumption to check: Limited features compared to competitors like Google Maps.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and improve UI design.
Assumption to check: Unintuitive navigation and complex UI layout.
Validate with people who use this workflow before building.
Hypothesis 4
Implement a customer support feature within the app.
Assumption to check: Lack of customer support and feedback response.
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
Ever wondered where you are at sea, how fast you’re going, how far until the next port of call, or how many hours remain on your journey? Cruise Nav gives you the answers—right from your phone. Key Features: • Works Offline: Uses GPS signals even in Airplane Mode to show your live position, speed, distance, and estimated time to destination. • Flexible Units: View distances in Kilometers or Nautical Miles. • Ports Worldwide: Search hundreds of ports, or add your own destination with a long press on the map. • Custom Routes: Draw your own route to get more accurate distance and time estimates. • Satellite & Map Views: See your trip your way, online or offline. Tips for Best Results: • GPS reception may be weaker inside the ship—try using the app near windows or out on deck. • For smooth offline use, open the app while still connected to the internet to cache map details. • Note: Continued GPS use can reduce battery life.
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 Navigation
Expo
Supabase
Axios
React Native Maps
Zustand
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.
