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
BoatNerd
Track vessel traffic across the Great Lakes and beyond with the BoatNerd App.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
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.
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'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 BoatNerd: 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
Implement offline maps feature for better usability.
Assumption to check: Limited offline functionality for navigation
Validate with people who use this workflow before building.
Hypothesis 2
Add customizable alerts for user-defined boat statuses.
Assumption to check: Lack of custom notifications for boat status changes
Validate with people who use this workflow before building.
Hypothesis 3
Introduce social features for sharing boat experiences.
Assumption to check: No user-generated content or community features
Validate with people who use this workflow before building.
Hypothesis 4
Provide a dashboard view for tracking multiple boats at once.
Assumption to check: Complexity in tracking multiple boats simultaneously
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
Track vessel traffic across the Great Lakes and beyond with the BoatNerd App. BoatNerd brings live AIS vessel tracking to your iPhone and iPad, making it easy for ship enthusiasts, photographers, maritime professionals, and waterfront observers to follow freighters, tankers, tugboats, passenger vessels, and more in real time. Whether you're watching from shore, planning a photography outing, or simply curious about maritime traffic, BoatNerd provides a fast and intuitive way to track vessels and stay connected to activity on the water. Features: • Live AIS vessel tracking and interactive maps • Real-time vessel positions, speed, course, and destination information • Detailed vessel profiles and navigation information • Search for specific vessels by name • ETA waypoint tools to estimate when a vessel will reach a selected location • Vessel Passage Section that shows past and future passages • Free US and Canadian Nautical Chart Layers • Free layers showing weather, buoys, weather ops and more • View traffic throughout the Great Lakes and other AIS-covered waterways • Easy-to-use interface optimized for mobile devices • Frequent updates powered by AIS data sources •… And because we are BoatNerds, a section where you can blow vessel salutes from your phone Perfect for: • Ship watchers and maritime enthusiasts • Great Lakes fans and waterfront communities • Marine photographers • Boaters and recreational mariners • Anyone interested in vessel traffic and maritime operations Download BoatNerd and stay connected to the vessels you love to follow—wherever they are on the water. Note: Vessel tracking depends on AIS signal availability and coverage. Some areas may have limited or delayed data.
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
Supabase
react-navigation
expo-location
@react-native-community/geolocation
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.
