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
Ship Captain's Medical Guide
Ever wonder what happens if you eye pops out of its socket? The answer to this and many other survival medicine tactics is included in The Ship Captain's Medical Guide
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.7
6 ratings · Top 50%
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 included17 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 Ship Captain's Medical Guide: map the core Reference 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
Expand database with more conditions and treatments.
Assumption to check: Limited content coverage of medical conditions
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate multimedia elements like videos or illustrations.
Assumption to check: User interface is not very engaging
Validate with people who use this workflow before building.
Hypothesis 3
Implement better categorization and search filters for easier access.
Assumption to check: Difficult to navigate due to lack of clear categories
Validate with people who use this workflow before building.
Hypothesis 4
Provide offline access to critical information for emergency situations.
Assumption to check: No offline access to content
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
Ever wonder what happens if you eye pops out of its socket? The answer to this and many other survival medicine tactics is included in The Ship Captain's Medical Guide. The Ship Captain’s Medical Guide app over 1,100 pages content developed by the United Kingdom’s Maritime and Coastguard Agency (MCA). The Ship Captain’s Medical Guide is intended for use on ships where no doctor is carried. The app includes recommended measures of prevention and treatment are therefore confined to those which can reasonably be expected of the ship’s officers. Now you can have access to this information too. Some topics covered include: - General principles of first aid - General assessment of the situation - Toxic hazards - General nursing - Care of the injured --- Internal injuries --- Head injuries --- Eye injuries --- Ear injuries --- Nose injuries --- Mouth and dental injuries --- Burns and scalds --- Dislocations --- Sprains and strains - Causes and prevention of diseases - Communicable diseases - Survivors - External assistance - Basic anatomy and physiology If you boat, hike, climb mountains, hunt, fish or spend time outdoors this guide provides you valuable information not found in traditional first aid and survival manuals. You might also be interested in our other boating apps: - Boater’s Pocket Reference - Navigation Rules - Seamanship
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
Supabase
React Navigation
Axios
React Native Paper
BUILD KIT DIFFICULTY
Starter
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.
