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
Seamanship
Information and procedures every boater needs to know
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
22 ratings · Top 5%
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/
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 Seamanship: 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
Enhance user engagement with interactive tutorials and quizzes.
Assumption to check: Limited interactivity with tools and resources
Validate with people who use this workflow before building.
Hypothesis 2
Improve search algorithms and allow for filters.
Assumption to check: Search functionality may not yield relevant results
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a freemium model with limited but useful features available for free.
Assumption to check: Subscription model may deter users due to cost
Validate with people who use this workflow before building.
Hypothesis 4
Regularly update resources and introduce user-generated content.
Assumption to check: Content may feel static and unchanging
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
Information and procedures every boater needs to know. Seamanship is the U.S. Coast Guard’s manual (Boat Crew Seamanship Manual, United States Coast Guard publication COMDTINST M16114.5C) of approved methods and procedures for conduct of Coast Guard boats and operations. The app incorporates and standardizes the current best practices employed within the Coast Guard boat operations community. It is the primary reference for the Boat Crew Training Program and shore based boat operations and seamanship training. Content includes: + Boat Crew Duties and Responsibilities + Team Coordination and Risk Management Factors + Survival Equipment and Pyrotechnics + Marlinspike, Knots, Splicing + Boat Characteristics + Stability + Boat Handling + Basic Maneuvering + Maneuvering to and from a Dock + Maneuvering in Rough Weather + Maneuvering in Rivers + Anchoring + Communications + Prowords and Common Abbreviations + Emergency Voice Communications + Distress Signals + Weather + Oceanography, Waves, Currents + Aids to Navigation + Navigation + Nautical Charts + Search and Rescue + Person-In-The-Water Recovery + Towing + Fire Fighting and Rescue + Heavy Weather Operations If you are a boater then Seamanship is the app for you. You might also be interested in our other boating apps: - Boater’s Pocket Reference - Navigation Rules - Ship Captain's Medical Guide
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
TypeScript
React Navigation
React Native Gesture Handler
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.
