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
FerryFriend
FerryFriend is the ultimate tool for ferry riders in the Puget Sound! Includes schedules and so much more for Washington State Ferries, Kitsap Transit Fast Ferries, and King County Water Taxi.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
2,899 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 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 FerryFriend: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
FerryFriend is the ultimate tool for ferry riders in the Puget Sound! Includes schedules and so much more for Washington State Ferries, Kitsap Transit Fast Ferries, and King County Water Taxi. Features: • Brand new Apple Watch app with schedules, predictions, and your favorite routes on your wrist. • CarPlay support so you can check sailings, predictions, and favorites without picking up your phone. • Home Screen and Lock Screen widgets for one-glance access to your favorite routes and ferry tickets. • Drive-time ETAs to the terminal from your current location, so you know how long it'll take to reach the dock. • Real-time delay predictions and demand forecasts so you know when sailings will be delayed and how full they'll be. • Sailing notifications for delays, departures, arrivals, loading, and reservation availability. • Cached schedules available offline, even when the WSF servers are down. • Inline reservation availability with quick booking from the app. • Drive-up space availability with historical filling trends. • Live vessel map with detailed status, departure/arrival times, and vessel specs. • Ferry line cameras on a map so you can check the line before you arrive. • Travel alerts with push notifications, snoozing, and day-of-week filtering. • Scan, save, and share your WSF ferry tickets right from the app. • Tide warnings and vessel load indicators in the schedule. • Heads-up on Kingston to Edmonds schedules when the terminal's new boarding-pass system is active, so you don't miss a stop at the kiosk near Lindvog Road. • Customizable delay display, projected departure time or time-late duration, whichever you prefer. • Dark mode and 24-hour time support. Includes information for these departing terminals: Anacortes Annapolis Bainbridge Island Bremerton Clinton Coupeville Edmonds Fauntleroy Friday Harbor Kingston Lopez Island Mukilteo Orcas Island Point Defiance Port Orchard Port Townsend Seattle (WSF and Pier 50) Shaw Island Sidney B.C. Southworth Tahlequah Vashon Island West Seattle (Seacrest Park) Includes data from: Kitsap Transit King County Water Taxi Washington State Ferries - WSDOT
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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 partnerships with more ferry services.
Assumption to check: Limited ferry routes compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a step-by-step booking flow guide.
Assumption to check: Some users find the booking process confusing
Validate with people who use this workflow before building.
Hypothesis 3
Optimize message loading times.
Assumption to check: In-app messaging can be slow
Validate with people who use this workflow before building.
Hypothesis 4
Introduce features to personalize ferry suggestions based on user preferences.
Assumption to check: Lack of user customization options
Validate with people who use this workflow before building.
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
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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.
