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
Hawaiian Fishing Calendar
The Hawaiian Fishing Calendar app uses precise astronomical calculations to show you the strongest feeding windows of the day, calibrated to your exact harbor location across Oahu, Maui, Big Island and Kauai.
$19.99 · In-app purchases
PRICE
$19.99
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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/
Preview a sample Build Kit No email needed
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 Hawaiian Fishing Calendar: map the core Weather 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
Focus on user feedback and continuous updates to improve the app.
Assumption to check: Limited user reviews to gauge reliability and performance
Validate with people who use this workflow before building.
Hypothesis 2
Implement a free trial to attract more users.
Assumption to check: High upfront cost without free trial
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing and community recommendations for better engagement.
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 4
Include more detailed weather forecasts and alerts.
Assumption to check: Missing advanced weather features
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 Hawaiian Fishing Calendar app uses precise astronomical calculations to show you the strongest feeding windows of the day, calibrated to your exact harbor location across Oahu, Maui, Big Island and Kauai. Features: • Solunar bite times — major and minor feeding windows based on moon transit and moonrise/moonset • Moon phase calendar with 1–3 star daily fishing ratings • NOAA tide predictions accurate to the minute for all major Hawaiian harbors • Interactive marine map with ocean base layer showing reefs, seamounts, and depth shading • Hawaii terrain-aware wind forecast — accounts for island wind shadows behind volcanic peaks • Fishing log — record daily catches with species, location, and notes • Historical moon phase lookups for any date Premium: Full calendar access, tide charts, precision bite times, fishing log, and historical lookups. $19.99/year — just $1.67/month. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Written user reviews are not shown here. Check current App Store reviews >
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
Zustand
react-navigation
axios
react-native-calendars
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.
