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
Maritime Master - Nav Lights
Master COLREGS navigation lights at night with interactive 3D views and a focused quiz mode.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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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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 Maritime Master - Nav Lights: 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
Implement a user feedback system to collect and display reviews.
Assumption to check: Lack of user reviews or ratings can deter downloads.
Validate with people who use this workflow before building.
Hypothesis 2
Add more lights and educational content to enhance user engagement.
Assumption to check: Limited content can make the app feel sparse.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and add onboarding tutorials for new users.
Assumption to check: Complex navigation structure can confuse users.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a free trial or a freemium model to attract more users.
Assumption to check: High price point for limited 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
Master COLREGS navigation lights at night with interactive 3D views and a focused quiz mode. Maritime Master – Nav Lights lets you explore realistic navigation light patterns in 3D and then test yourself on vessel type and aspect recognition. Rotate around the ship, see how the lights change with your bearing, and connect what you see to the COLREG rules that define each pattern. Explore COLREGS light patterns Browse a full set of navigation light configurations for power-driven vessels, vessels at anchor and aground, NUC, RAM, mine-clearance, dredgers, tugs and tows, fishing vessels, pilot vessels, air-cushion craft and WIG craft. View each pattern on a dark-hull 3D ship at night and drag to rotate around it to see the lights from dead ahead, bow, beam, quarter and astern. See a clear, plain-language COLREG rule overview for every pattern, linked to Rules 23, 24, 26, 27, 28, 29, 30 and 31. Check exactly which physical lights are fitted with a breakdown of masthead, sidelights, sternlight, towing light and all-round signal lights. Smart reference and search Group patterns by COLREG rule, by vessel size (over 50 m / under 50 m), or browse a simple A–Z list. Use the built-in search to find patterns by name, summary or rule number (for example “Rule 27”, “NUC”, “tug towing”, “fishing trawling”). Night Lights Quiz Practice recognising navigation lights in realistic 3D: each question shows a night view of the vessel from a specific aspect. Choose the correct combination of vessel type + aspect from multiple-choice answers. Use the binocular zoom button to temporarily zoom in on the lights. Get instant feedback: see your score update, and after each question review the correct answer (and your wrong answer when you miss it). Finish the quiz with a clean results screen showing total score and accuracy. Perfect for learners and refresher training Great revision for COLREGS / navigation lights questions in yachting and maritime exams. Helpful for skippers, students, cadets and watchkeepers who want to turn confusing night light patterns into something they recognise at a glance. This app is a study aid only and is not an official training course or exam.
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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
zustand
react-navigation
shadcn/ui
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.
