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
NW Ferry
Plan your Washington State Ferry trip in seconds
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
2,213 ratings · Top 15%
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 included19 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 NW Ferry: 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
Provide detailed descriptions, photos, and reviews for each route.
Assumption to check: Limited route information
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the booking flow with clear steps and guidance.
Assumption to check: Booking process can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Optimize messaging system for quicker responses and notifications.
Assumption to check: In-app messaging can be slow
Validate with people who use this workflow before building.
Hypothesis 4
Implement live updates for ferry schedules and availability.
Assumption to check: Lack of real-time updates
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
Plan your Washington State Ferry trip in seconds. NW Ferry gives you real-time schedules, live vessel tracking, service alerts, terminal cameras, and drive-up space estimates — everything you need, in one fast app. Whether you're a daily commuter or heading to the San Juan Islands for the weekend, NW Ferry keeps you one step ahead at the dock. What you get with NW Ferry: - Real-time schedules & fares: Check upcoming departures, fares, and seasonal schedule changes for every WSF route - Live vessel tracking: Watch ferries cross Puget Sound in real time - Service alerts: Know about delays, cancellations, and route changes before you leave - Terminal cameras: See dock conditions before you drive there - Drive-up space: View estimated vehicle space remaining for upcoming sailings - Favorites & recents: Save your go-to terminal pairs and jump back to recent routes in one tap - Quick route swap: Reverse your departure and arrival terminals in one tap - Apple Watch app & widgets: Check your next sailing from your wrist — with Closest Terminal and Favorite Terminal widgets - Home Screen & CarPlay widgets: See upcoming departures at a glance, including a Favorite Terminal widget for CarPlay Terminals covered: Anacortes, Bainbridge Island, Bremerton, Clinton, Coupeville, Edmonds, Fauntleroy, Friday Harbor, Kingston, Lopez Island, Mukilteo, Orcas Island, Point Defiance, Port Townsend, Seattle, Shaw Island, Sidney B.C., Southworth, Tahlequah, and Vashon Island. NW Ferry requires an internet connection to load live schedule, fare, and vessel data. NW Ferry is an independent app and is not affiliated with WSDOT or Washington State Ferries.
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
Axios
Redux
Expo
React Native Paper
BUILD KIT DIFFICULTY
Advanced
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.
