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.
The Performance Marine GPS for Racing & Sailing
$9.99 · 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 Watch Chartplotter: 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 user reviews and feedback on usability
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Subscription model may deter casual users
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Potentially steep learning curve for new users
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of community features or social sharing options
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.
The Performance Marine GPS for Racing & Sailing Transform your Apple Watch into a powerful, tactical racing computer. Watch Chartplotter is designed for competitive sailors, windsurfers, and kite racers who demand real-time performance data right on their wrist. Leave the bulky electronics behind and get the critical metrics you need to sail faster and smarter. Optimize Your Performance with VMG Make better tactical decisions with live Velocity Made Good (VMG). See exactly how fast you are closing in on your next waypoint and adjust your heading to maximize your efficiency toward the mark. Essential Racing Metrics on Your Wrist Stay informed without losing focus. Get instant, glanceable access to your most vital data: Real-Time Speed: Track your current boatspeed in knots, mph, or km/h. Average & Max Speed: Monitor your session's performance and push for a new personal best. Precise Heading: See your current course and the bearing to your next waypoint. Distance to the mark: Know exactly how far you have to go. Compass bearing to the mark: Know which direction on a compass the next waypoint is. Seamless Waypoint Navigation Plan your course on your iPhone and sync it directly to your watch. The app automatically transitions to the next waypoint as you round a mark, with haptic feedback to keep you alerted without needing to look at the screen. Disable and optionally hide waypoints. Disabled waypoints will be skipped when automatically going to the next waypoint. Offline Marine Charts Navigate with confidence using NOAA MACHC (U.S, Parts of South and Central America, Caribbean, Netherlands and some Pacific Islands), Australian Hydrographic Office (Australia) and OpenSeaMap (Worldwide) charts. Download offline. Power users can also add custom WMS and XYZ map servers for specialized layers. Built for the Elements Water Lock: Prevents accidental screen touches from spray and waves. HealthKit Integration: Logs your racing sessions as workouts, tracking your route, heart rate, and calories burned. Pay Once, Race Forever. Enjoy all professional features with a single purchase. No subscriptions, no hidden fees. Perfect for dinghy racing, catamaran sailing, kite foiling, and any on-water activity where performance matters. Get the winning edge with Watch Chartplotter. Note: This app is not certified for navigation. It is not an official navigational chart and must not be used for navigation or any related operational decision-making. It is designed to support shore-based maritime awareness and analysis. Map and chart data copyright: NOAA, MACHC, Australian Hydrographic Office, OpenStreetMap, Thunderforest and Mapbox.
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.