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.
Sea Current Measure Tool helps sailors and coaches quickly measure sea current speed and direction directly on the water using only an iPhone.
$19.99 · 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 Sea Current Measure Tool: map the core Sports 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: Limited functionality for advanced measurements
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of social sharing options
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Subscription management can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline access to measurements
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.
Sea Current Measure Tool helps sailors and coaches quickly measure sea current speed and direction directly on the water using only an iPhone. The app is designed for sailing race preparation and training. Understanding the current in the race area can be critical for making the right tactical decisions. Even small currents can affect boat speed, laylines and mark roundings. Sea Current Measure Tool allows you to perform quick and reliable current measurements while on the water. Simply drop a floating stick or object into the water, press Start, wait a few seconds, retrieve the stick and press Stop. The app calculates the speed and direction of the water movement using GPS data. All measurements are stored so you can review them later and build a better understanding of the current patterns in your sailing area. Features Measure sea current speed and direction Simple start and stop measurement process GPS based current calculation View a list of all measurements Display measurements on the map Useful for race preparation and training sessions Designed for sailing coaches and racers How it works Drop a measuring stick or floating object in the water Press Start when the stick enters the water Wait a few seconds while the stick drifts Retrieve the stick and press Stop The app calculates the current vector based on the GPS movement Use cases Sailing race preparation Training sessions Understanding current patterns Mapping current across the race area Coaching analysis and tactical planning Sea Current Measure Tool is designed for sailors who want a fast and practical way to measure sea current directly on the water without additional equipment. Location access is required to calculate the movement of water during measurements and to display measurements on the map.
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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.