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
Ferry Finder
Easily find your way to/from Fire Island communities serviced by Sayville Ferry (Pines, Cherry Grove, Water Island & Sailors Haven), Bay Shore Ferry (Ocean Bay Park, Ocean Beach, Fair Harbor, Kismet, Saltaire, Seaview...
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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 included18 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 Ferry Finder: 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
Expand database to include more routes and services.
Assumption to check: Limited ferry route coverage
Validate with people who use this workflow before building.
Hypothesis 2
Implement a consistent design language throughout the app.
Assumption to check: Inconsistent user interface
Validate with people who use this workflow before building.
Hypothesis 3
Optimize API calls and data caching for faster access.
Assumption to check: Slow loading times for route details
Validate with people who use this workflow before building.
Hypothesis 4
Integrate more payment gateways to improve user experience.
Assumption to check: Limited payment options
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
Easily find your way to/from Fire Island communities serviced by Sayville Ferry (Pines, Cherry Grove, Water Island & Sailors Haven), Bay Shore Ferry (Ocean Bay Park, Ocean Beach, Fair Harbor, Kismet, Saltaire, Seaview, Dunewood & Atlantique) and Davis Park Ferry (Davis Park & Watch Hill) from New York City. Simply choose From, To, Date, Time to select from all matching routes found between Long Island Rail Road and Sayville Ferry routes. Want a specific ferry? Just select the desired ferry time to see the routes within your time frame. Also, Ferry Only option is available by selecting the Ferry Station and the Fire Island Community. For example, to see just the Ferry Schedule to Fire Island Pines, choose Sayville to Fire Island Pines! Share your Journey (Train and Ferry schedule details) over SMS (text message) while viewing any route details using the "action" icon. Go forth and Share! Have an app feature request? Send it in! Have a complaint? Ugh! Send it in, too! See you on Fire Island! Upcoming features under development: ○ Push notifications providing a heads up as it is time to make the connection or get off the train! ○ Real-time LIRR status updates! NOTE: This app is not associated with Sayville Ferry Service, Fire Island Ferries nor MTA/LIRR. It does include and display data provided the respective transit providers in an off-line manner.
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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
Firebase
Redux
Axios
React Navigation
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.
