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
Amtrak Destinations Pro
Never worry about missing your train station with Amtrak Destinations
$19.99 · In-app purchases
PRICE
$19.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.8
34 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 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 Amtrak Destinations Pro: 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
Enhance listings with more detailed guides and user-generated content.
Assumption to check: Limited destination information compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a cleaner onboarding process with guided tours.
Assumption to check: User interface can be confusing for first-time users.
Validate with people who use this workflow before building.
Hypothesis 3
Offer a freemium model with features unlocked via subscription.
Assumption to check: High price point for app access without a free trial.
Validate with people who use this workflow before building.
Hypothesis 4
Add an in-app messaging feature for user support and community interaction.
Assumption to check: In-app messaging is limited.
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
Never worry about missing your train station with Amtrak Destinations. Receive timely alerts as you approach your station, allowing you to sit back and relax. Stay informed with all the information you need while traveling, whether you're a frequent commuter or just on a quick day trip – Destinations has something for everyone. — STATION ALERTS — Bid farewell to the days of worrying about missing your stop. Simply choose your station, and get notified when you're almost there. Enjoy a peaceful sleep after a long day, kick back and watch a movie, or receive an alert during your adventure to a new place! — BE IN THE KNOW — Trying to figure out where you are? Or how much time you have until your train station? Wonder no more! Destinations provides real-time information on your current location, arrival time, remaining travel time, distance to your destination, and even your speed! View your location on a map and track your journey. — CUSTOMIZABLE — Tailor your trip to your preferences. Decide how close to your station you want to be alerted and even choose the notification sound that plays when you're almost there. — SUPER SIMPLE — Destinations is designed to be both beautiful and incredibly user-friendly. Whether you want to follow your trip as you travel or quickly set a destination and take a nap, Destinations can do it all and more. New features and fixes are always on the way! If you have a feature you would like to see in the app or even a quirky bug that you found, feel free to reach out. We’re always excited to hear from our users! We read all emails and reviews, so please leave a review below or reach out to us at [email protected] Happy travels! Amtrak Destinations is not affiliated with the any rail companies. From time to time, Destinations may briefly access your GPS in order to have higher confidence in your location. Battery life is very important to us and we do many things to ensure we use it sparingly. Please be aware that continued use of GPS services running in the background can dramatically decrease battery life.
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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
Supabase
React Navigation
Zustand
react-native-reanimated
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.
