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
Okinawa Dive Watch
Okinawa Dive Watch is the fastest way to know if today is a good day to dive.
$3.99 · In-app purchases
PRICE
$3.99
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's included16 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 Okinawa Dive Watch: map the core Travel 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
Integrate friend tracking and sharing options for dives.
Assumption to check: Limited user engagement and retention due to lack of social features.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a user-generated content feature for location recommendations.
Assumption to check: Difficulty in finding diving locations.
Validate with people who use this workflow before building.
Hypothesis 3
Add offline dive log functionality.
Assumption to check: No offline capabilities, which can be problematic in remote dive spots.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce analytics on dive performance and history.
Assumption to check: Lack of dive statistics and analytics for users.
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
Okinawa Dive Watch is the fastest way to know if today is a good day to dive. Built for divers, instructors, and dive shops across Okinawa — from Maeda's Blue Cave to Cape Zanpa, Motobu, Kerama, Naha, and the southern reefs — Dive Watch pulls live ocean and weather data straight to your phone so you stop guessing and start diving. WHAT YOU GET • Real-time wind speed, gusts, and direction at every major dive site • Live wave height, swell period, and direction from marine forecast models • Sea surface temperature and air temperature • Tide charts with high/low times for each region • Live HD webcams pointed at popular entry points (Maeda, Onna, Motobu, Naha, Zanpa) • A simple go / caution / no-go score per site, calculated from current conditions • Forecast view so you can plan tomorrow's dive, not just today's WHY IT EXISTS Conditions on the East China Sea and Pacific sides of Okinawa can flip in hours. A site that's glassy at sunrise can be 2-meter swell by lunch. Dive Watch consolidates the data that local guides already check across five different websites — wind, swell, tide, webcam, sea temp — into one screen, refreshed live. WHO IT'S FOR • Recreational divers visiting Okinawa • Local instructors and dive masters checking morning conditions • Dive shop owners deciding whether to run a charter • Snorkelers, freedivers, and spearfishers • Military divers stationed on Okinawa No ads. No paywalls on conditions data. Just a fast, focused tool that respects your time and your safety. Data sources: Open-Meteo weather and marine APIs, WorldTides, and partnered live webcam feeds. Site database curated locally in Okinawa. Dive smart. Dive Okinawa.
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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 Native
Expo
Supabase
react-navigation
react-native-maps
@react-native-community/geolocation
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.
