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.
An intuitive, easy to use tactical mobile application for sailors by sailors
$4.99 · 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 tack X Sailing Regatta Timer: 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: Poor user interface and experience
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of features for event management
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Limited customization options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent performance and bugs
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.
An intuitive, easy to use tactical mobile application for sailors by sailors. Built and optimized for iPhone and Apple Watch. Maximum feedback with minimal user input. Easy to use interfaces with highly visible displays. Distance to line, tactical pre-start data, and a race dial that tracks wind shifts and headers! We are happy to announce that all these features are also available on the Apple Watch. At tack X, our mission is simple. First, we provide sailors clear and concise data in all conditions. Second, we foster the improvement of sailing skills and a lifetime of learning through technology. Not only do we write and test the software for our customers, we use it too. Every member of our team uses tack X. Our continuous field testing process means a better experience for you. Not a racing sailor? Not a problem there are features for you too! Use the nav display for position and course information. Use the "line manager" to calculate distances and times to coordinates. And more! Features for all devices: - Easily readable user interfaces with large, clear fonts optimized for viewing in bright sunlight even with polarized lenses - Time your start to a tenth of a second - Track your distance to the start line - Pre-start course guidance and tactics - Track wind shift lifts and headers - Line length, seconds to run line, seconds to line - Map view - Manual boat and pin input - Signal K for NMEA integration - Apple Health App integration - add to your daily exercise goal while you sail - Night Mode - Diagnostics - And much more ******** DOWNLOAD THE USER GUIDE ******** Available at the developer & support URL. Before leaving a review - please contact us at the support link - we are here to help! We are constantly improving tack X. We have many features planned for upcoming releases. If you have a feature you want to see let us know! *Note that this app uses your location in the background. Using location background mode may dramatically decrease battery life.
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.