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.
VesselFinder is the world’s most popular and trusted vessel tracking and marine traffic app, delivering real-time information on ship positions and movements worldwide
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for VesselFinder: 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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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
Assumption to check: Inconsistent real-time data updates
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited search functionality
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Cluttered UI with too many options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Poor offline functionality
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
VesselFinder is the world’s most popular and trusted vessel tracking and marine traffic app, delivering real-time information on ship positions and movements worldwide. Using a powerful network of satellites, roaming and terrestrial AIS receivers, VesselFinder provides accurate and up-to-date insight into global maritime activity. Designed for maritime professionals, shipping enthusiasts, and anyone interested in live ship tracking, VesselFinder offers a fast, intuitive, and reliable way to explore vessel traffic across the globe. VesselFinder key features: • Real-time tracking of over 300,000 vessels daily using global AIS data • Vessel movement history with track visualization • Predicted routes and ETAs to next port • Comprehensive vessel particulars, including technical specifications, and cargo capacity information • Contact details for the owning company, manager, ISM manager, and more • Port Calls per vessel, showing arrival times and duration of stay • Port Calls per port, with detailed lists of expected vessels, arrivals, departures, and ships currently in port • My Fleet – save and monitor favorite vessels, synchronized with your VesselFinder account • My Views – save preferred map views for fast and easy navigation • Ship Photos contributed by the VesselFinder user community • Multiple map styles: Simple, Detailed, Dark, Satellite, and Nautical • Weather overlays, including wind, waves, and temperature • See your location feature for instant orientation • Distance measurement tool for route and range estimation Vessel visibility depends on AIS signal availability, with near-shore coverage consistent with the data provided on VesselFinder.com. If a vessel is outside our terrestrial AIS coverage area, its last reported position will be displayed and updated as soon as new data is received. Extended real-time coverage via satellite and roaming AIS sources is available through a subscription. While we make every effort to ensure accuracy, the completeness of the information cannot be guaranteed. Connect with VesselFinder • Facebook: http://www.facebook.com/vesselfinder • Twitter: http://www.twitter.com/vesselfinder
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.