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
SeaDays - Seafarer Tracker
SeaDays – Built for life between trips
$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/
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 SeaDays - Seafarer Tracker: map the core Finance 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
Simplify the linking process with better UI and guidance.
Assumption to check: Difficulty in linking bank accounts smoothly
Validate with people who use this workflow before building.
Hypothesis 2
Provide more categories and allow users to create custom ones.
Assumption to check: Limited transaction categorization options
Validate with people who use this workflow before building.
Hypothesis 3
Implement notifications for reminders on adding transactions.
Assumption to check: Inadequate alerts for transaction entries
Validate with people who use this workflow before building.
Hypothesis 4
Add comprehensive reports and analytics on spending and savings trends.
Assumption to check: Lack of detailed analytics
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
SeaDays – Built for life between trips SeaDays is a simple, reliable tool for seafarers who need to track their offshore days, time at home, earnings, expenses, and leave across trips and years. Life at sea isn’t just about time offshore. It’s about everything in between. SeaDays helps you keep clear, accurate records so you always know where you stand. Whether you’re managing your working patterns, preparing information for tax or compliance purposes, or simply wanting better oversight of your time and income, SeaDays keeps it all in one place. What you can do with SeaDays • Track offshore days and days at home • Log trips and rotations clearly • Record earnings per trip or per year • Track expenses and leave • View yearly summaries of your time and income • Keep consistent records across multiple trips Designed for seafarers by seafarers SeaDays is built specifically for seafarer life. It’s simple to use, flexible enough for different work patterns, and designed to work wherever you sail. No spreadsheets. No guesswork. Just clear records you can rely on. Why SeaDays • Built for seafarers worldwide • Clean, easy-to-use interface • Designed around real seafarer schedules • Clear records you can trust Built for life between trips SeaDays fits around your routine, not the other way around. Log your days, understand your numbers, and stay in control between trips.
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 Navigation
Zustand
React Native Paper
@supabase/supabase-js
React Native Picker
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.
