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
ChiTrack: Tracker for CTA
Taking the train to work just got a whole lot easier! ChiTrack is the easiest, fastest, and most reliable Chicago Transit Authority (CTA) train tracker for your everyday commute.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
8 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.
Build your own version
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 included17 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 ChiTrack: Tracker for CTA: 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 offline maps and route saving features.
Assumption to check: Limited offline functionality for users without data
Validate with people who use this workflow before building.
Hypothesis 2
Simplify onboarding and navigation for first-time users.
Assumption to check: Complex UI for new users
Validate with people who use this workflow before building.
Hypothesis 3
Enhance real-time data accuracy and speed.
Assumption to check: Inconsistent real-time updates
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to categorize and organize saved routes.
Assumption to check: Limited customization options for favorites
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
Taking the train to work just got a whole lot easier! ChiTrack is the easiest, fastest, and most reliable Chicago Transit Authority (CTA) train tracker for your everyday commute. ----------------- What makes ChiTrack different: - Official, real‑time arrival data: Direct data from the CTA API, unlike Google or Apple Maps - Your direction only: Choose Belmont → Loop (or any stop + direction) and skip irrelevant trains. - Zero‑tap arrivals: Open the app and home + favorite stops refresh automatically. - Glance‑friendly design: Large, clean arrival times you can read in a second. - Search any station: Full coverage when your routine changes. Made by a Chicagoan, for Chicagoans who ride the L every day. ----------------- ChiTrack: Chicago CTA Tracker is not affiliated with the CTA or Ventra. All arrival times come from the public CTA Train Tracker API. Ventra® is a registered trademark of the Chicago Transit Authority / Cubic Transportation Systems. ChiTrack is an independent product and is neither endorsed by nor connected to CTA or Cubic.
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
axios
react-native-maps
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.
