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
Watch Sailing Timer
The Perfect Standalone Watch App for Sailors and Yacht Racing Enthusiast!
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 Watch Sailing 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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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
Introduce extensive timer settings and presets.
Assumption to check: Limited timer customization options
Validate with people who use this workflow before building.
Hypothesis 2
Add animations and visual cues during timer operation.
Assumption to check: No visual feedback while timer is running
Validate with people who use this workflow before building.
Hypothesis 3
Include onboarding walkthrough for new users.
Assumption to check: Lack of tutorial for new users
Validate with people who use this workflow before building.
Hypothesis 4
Enable sharing timers and results to social media or sailing communities.
Assumption to check: Poor integration with other apps
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
The Perfect Standalone Watch App for Sailors and Yacht Racing Enthusiast! - Simple and easy-to-read countdown - Sync time to the nearest minute - Voice count down - Action Button support on Apple Watch Ultra - Start a countdown from the watch face - Turn the Digital Crown to add or subtract a minute at a time from your countdown — adjust the running timer without stopping it. The app also integrates with Apple Health to track your sailing workouts. All in a beautiful app. Key Features: - Choose from predefined countdowns (1 to 5 minutes) or select up to 5 custom durations to suit your training needs. - Start a countdown directly from your watch face – perfect for that sudden warning signal. - Start a countdown by pressing the Action Button on Apple Watch Ultra. Press again to sync time! Easy! Optional Apple Health Integration - HealthKit support: Automatically log your sailing workouts in HealthKit to keep track of your training and races. User-Friendly Interface - Intuitive design: A sleek, easy-to-navigate interface tailored for Apple Watch, so you can control your timer even under challenging conditions. - Haptic feedback: Feel vibrations every minute during the countdown, and at 30, 20, 10, and the final 5 seconds. - Background mode: The countdown continues even when the app runs in the background. Custom Settings - Personalize your experience: Adjust haptic feedback, select preferred countdown durations, and choose whether to save workouts to HealthKit. - Decide if you want to display the duration of the workout after the start. Action Button Support - Press once when you hear the warning signal to start the timer. - Press again to sync time. - Press the Action Button and the side button together to pause. - Press them again to reset the timer, ready for a new countdown. Make sure to allow Apple Health to fully utilize the Action Button. Permission is required before the Action Button can start a workout and thus a countdown. The app does not store anything in Health or read any data — unless you enable it in settings. --- Get Started Today! Download Watch Sailing Timer now and take the first step towards mastering your sailing routine. Whether you're training for a championship or enjoying leisurely races, our app is your perfect sailing partner. --- Experience the ultimate in sailing timer technology—only on Apple Watch.
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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 Navigation
Zustand
Expo
React Native Picker
React Native Reanimated
Firebase for Authentication
BUILD KIT DIFFICULTY
Intermediate
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.
