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
FX Replay
Take your trading skills to the next level with FX Replay, the ultimate Forex market replay and backtesting simulator
$12.99
PRICE
$12.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
1 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.
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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 included16 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 FX Replay: 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
Include a comprehensive dashboard that shows all trades at a glance.
Assumption to check: Users find it hard to track multiple currency trades.
Validate with people who use this workflow before building.
Hypothesis 2
Add advanced filtering and comparison tools for historical data.
Assumption to check: Limited historical data analysis features.
Validate with people who use this workflow before building.
Hypothesis 3
Provide interactive tutorials or tooltips explaining calculations.
Assumption to check: Users struggle with understanding profit/loss calculations.
Validate with people who use this workflow before building.
Hypothesis 4
Implement AI-driven suggestions based on user trading history.
Assumption to check: Lack of personalized trade recommendations.
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
Take your trading skills to the next level with FX Replay, the ultimate Forex market replay and backtesting simulator. Whether you are a beginner learning the ropes or an experienced trader refining your edge, FX Replay allows you to practice trading on real historical chart data, completely risk-free. Stop waiting for the live market to present opportunities. With our advanced replay engine, you can simulate days, weeks, or even months of market price action in just a few hours. Test your strategies, build your confidence, and master your trading psychology anywhere, anytime. KEY FEATURES Historical Market Replay Travel back in time and replay real historical candlestick data. Control the speed of the market: play, pause, step forward candle-by-candle, or fast-forward to find your desired trading setups instantly. Extensive Cloud Datasets & Data Management Access a rich, built-in library of high-quality historical data ready for instant download and backtesting. Our available Cloud Datasets include: • Forex: EURUSD data back to 1971 GBPUSD data back to 1971 USDJPY data back to 1971 AUDUSD data back to 1993 USDCAD data back to 1993 USDCHF data back to 1971 • Commodities: XAUUSD data back to 2006. XAGUSD (Silver) USOIL (WTI) data back to 2019 UKOIL (Brent) data back to 2016 • Indices: US500 data back to 2000. US100 data back to 2000. • Crypto: BTCUSD data back to 2019 Want to trade something else? Easily import your own custom CSV data and perfectly replicate real-market conditions by customizing symbol settings like Spread, Tick Value, Contract Size, and Swaps. Realistic Trading Simulator Experience the thrill of live trading without the financial risk. Open and close positions, set Stop Loss (SL) and Take Profit (TP), and utilize the One-Click Trading panel for rapid execution. Advanced Charting and Indicators Analyze the market with a professional-grade charting interface inspired by the familiar MetaTrader 5 (MT5) layout. Utilize built-in technical indicators (including ZigZag) and drawing tools to mark up your charts just like you would in a live trading environment. Portfolio and History Management Track your simulated trading performance. Review your trading history, analyze your win rate, and monitor your virtual account balance to see if your strategy is truly profitable before going live. Seamless Cross-Platform Experience Designed with a highly intuitive interface, FX Replay offers a powerful, fluid backtesting experience optimized for both iOS and macOS. Why choose FX Replay? • Save Time: Gain years of screen-time and trading experience in a fraction of the time. • Zero Risk: Perfect your strategies using a virtual balance before risking real capital. • Familiar UI: Designed to feel just like the professional trading platforms you already know and love. Start mastering the markets today. Download FX Replay and turn historical data into future profits!
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
Supabase
Axios
Chart.js
Zustand
BUILD KIT DIFFICULTY
Advanced
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.
