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
Philly Trolleys
Philly Trolleys shows you where SEPTA's vintage PCC Trolleys are running on the G Line (Girard Avenue) right now, so you can plan a ride on a piece of Philadelphia transit history.
$4.99
PRICE
$4.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
5 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 included15 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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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.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Philly Trolleys shows you where SEPTA's vintage PCC Trolleys are running on the G Line (Girard Avenue) right now, so you can plan a ride on a piece of Philadelphia transit history. The PCC cars share the route with buses and do not run every day. This app tracks the trolleys specifically, tells you which cars are out, where each one is heading, and how to reach the line from any SEPTA Metro or Regional Rail station. What you get: - Live trolley positions on the G Line, refreshed every minute - Directions to the nearest pickup point from any Metro or Regional Rail station, with live train and trolley times - Trolley alerts, your way: one notification a day when the first PCC car appears, or one for every car that starts running - Stop alerts: save your G Line stop and direction, and get a notification when a PCC car is a few stops away - Home screen and lock screen widgets showing how many PCC cars are out and which ones - Share the app with a friend straight from the footer - Service analytics: typical hours, busiest days, the car roster, and the record books - Works underground: the app remembers the last positions and analytics it saw and shows them, labeled with their time, until you are back online Pay once and keep it. No subscriptions, no ads, no accounts, no tracking. Philly Trolleys is an independent project made in Philadelphia. It is not affiliated with SEPTA. Vehicle positions and schedules come from SEPTA's public data feeds.
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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
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.
