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
NextTrain DC Metro - AR
Apple Watch app is now included
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.2
13 ratings · Below Average
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included15 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 NextTrain DC Metro - AR: map the core Navigation 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
Implement robust error handling and testing to improve stability.
Assumption to check: Poor user reviews due to app crashes and bugs
Validate with people who use this workflow before building.
Hypothesis 2
Add offline maps and caching features for better usability.
Assumption to check: Lack of offline functionality
Validate with people who use this workflow before building.
Hypothesis 3
Enhance AR features for a more immersive navigation experience.
Assumption to check: Limited AR functionality compared to competitors
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the UI for easier navigation and improved user experience.
Assumption to check: Cluttered interface with too many 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
Apple Watch app is now included. Enjoy checking next arrivals on your Apple Watch! Force touch to access the favorite stations you have saved on your iPhone app with just one tap! ----------------------------------------------- Thanks fellow Washingtonians for making NextTrain DC Metro the #1 downloaded DC Metro app on the App Store and for helping it break into the Top 10 Navigation Apps! ----------------------------------------------- NextTrain DC Metro tells Washington DC metro train riders how many minutes are left until the next train comes. NextTrain DC Metro works with all metro stations in the DC Metro area, and for trains in all directions. Station names can be sorted alphabetically or according to distance from the user's location. Alphabetical sorted stations have a tappable index for quick access. Additional features include walking directions to any selected metro station and storage of favorite stations. With this app, you will never be in a rush when not necessary. You can savour your last minutes drinking a coffee knowing that it isn't until 7 more minutes that the train will come. Never wait for trains again. Just two iPhone screen touches will put all the information you need in front of you immediately.
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
react-navigation
@react-native-maps
axios
react-native-augmented-reality
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.
