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
Market Sessions
Market Sessions helps you track when major stock exchanges are open, closed, on a market break, opening soon, or closing soon at a glance.
$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.
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 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 Market Sessions: map the core Finance 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 user testimonials and ratings features.
Assumption to check: Lack of user reviews and trust in new finance apps
Validate with people who use this workflow before building.
Hypothesis 2
Provide charts and historical data visualization.
Assumption to check: Difficulty in tracking performance over time
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to set more complex conditions for alerts.
Assumption to check: Limited alert customization options
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the purchasing process with clear explanations and trial options.
Assumption to check: In-app purchase confusion
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
Market Sessions helps you track when major stock exchanges are open, closed, on a market break, opening soon, or closing soon at a glance. Star your favorite exchanges and follow them with a Timeline of their next openings, closings, and trading breaks, synced automatically between iPhone and Apple Watch. Add clean widgets, complications, in-app countdowns, and timely notifications, and Market Sessions keeps you on top of exchange hours wherever you trade or travel. Features: • Star your favorite exchanges for quick access • See a Timeline of the next few openings, closings, and trading breaks for your favorites • Keep favorites in sync automatically between iPhone and Apple Watch • Track major global exchanges across the Americas, Europe, and Asia • See whether a market is open, closed, or on a lunch break right now • View countdowns to the next open, close, or break in the app and widgets • Check each exchange's current local time • View opening hours converted to your local time • Get notifications when markets open, close, or pause for a market break • Set advance notifications 5, 10, 15, 30, or 60 minutes before open or close • Use iOS Shortcuts to check market status, next opening time, or next closing time • See upcoming exchange holidays • Support for shortened holiday sessions where applicable • Support intraday market breaks for exchanges that pause trading during the day • Home Screen and Lock Screen widgets • Apple Watch app and complications • Works 100% offline, including notifications and iOS Shortcuts integration • Simple, fast, and privacy-friendly design Please note: pre-market and after-hours trading sessions are not supported. Supported exchanges: • NYSE — New York Stock Exchange • NASDAQ — Nasdaq Stock Market • LSE — London Stock Exchange • JPX — Japan Exchange Group / Tokyo Stock Exchange • SSE — Shanghai Stock Exchange • SZSE — Shenzhen Stock Exchange • ASX — Australian Securities Exchange • ENX Paris — Euronext Paris • GPW — Warsaw Stock Exchange • KRX — Korea Exchange • NSE — National Stock Exchange of India • SIX — SIX Swiss Exchange • XETRA — Frankfurt Stock Exchange (Xetra) • HKEX — The Stock Exchange of Hong Kong • TSX — Toronto Stock Exchange • B3 — Brazil's Stock Exchange Market Sessions is designed for investors, traders, finance professionals, frequent travelers, and anyone who wants a quick overview of global market hours without opening a heavy finance app.
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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
Zustand
Axios
react-navigation
date-fns
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.
