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
OntarioTransit Departure Times
Get real-time GO train updates – straight from the source.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 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/
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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 OntarioTransit Departure Times: 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 a feature for users to report inaccuracies.
Assumption to check: Real-time data may not always be accurate.
Validate with people who use this workflow before building.
Hypothesis 2
Provide offline maps and schedule downloads.
Assumption to check: Limited offline capabilities.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the purchasing process with clear explanations.
Assumption to check: In-app purchases might confuse users.
Validate with people who use this workflow before building.
Hypothesis 4
Add social features like sharing favorite stops or routes.
Assumption to check: Lack of user engagement features.
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
Get real-time GO train updates – straight from the source. Our app gives you instant, accurate train departure information for any GO Station – powered by the same system used by the real GO station displays. LIVE DEPARTURES, DELAYS & PLATFORM INFO Know exactly when your next train leaves right from your Home Screen See if it’s delayed and by how much Get platform assignments (and changes!) before you arrive – even when station signs don’t show them Set your Home & Work stations Automatically see the next train home or to work on your Lock screen Customize directions: inbound or outbound Lock Screen & Home Screen Widgets Stay updated without opening the app Lock screen widgets for quick glances while commuting Home screen widgets showing both directions at once Better than the station boards Many GO stations don’t show platforms until the last minute – or at all. Our app gives you real-time platform info ahead of time so you’re never guessing where to go. Updated every minute Our data connects directly to the official GO feed, so what you see is what’s happening live.
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
Zustand
axios
react-navigation
expo-location
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.
