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.
Find profitable prediction market arbitrage opportunities in seconds.
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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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
Your first Build Kit is free with a verified email.
Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Polymarket Arbitrage Calc: map the core Business workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Find profitable prediction market arbitrage opportunities in seconds. Polymarket Arbitrage Calculator helps traders calculate stake distribution, expected profit, ROI, and guaranteed returns across multiple prediction market outcomes. Whether you're trading on a single platform or comparing prices across multiple exchanges, the app simplifies complex calculations so you can make faster and more informed decisions. No spreadsheets. No manual formulas. Just accurate calculations. Key Features Prediction Market Arbitrage Analyze arbitrage opportunities across prediction markets by entering outcome prices and instantly seeing whether a profitable opportunity exists. Cross-Platform Calculator Compare prices between different prediction market platforms to identify potential arbitrage opportunities before placing trades. Single Platform Analysis Calculate arbitrage opportunities within a single prediction market by evaluating all possible outcomes. Smart Stake Allocation Automatically calculate the exact amount to invest in each outcome to maximize potential returns while balancing your investment. Profit & ROI Calculator Instantly view: • Expected Profit • Return on Investment (ROI) • Guaranteed Return • Total Investment • Gross Payout • Net Profit After Fees Fee Calculator Include real-world costs such as: • Trading Fees • Network (Gas) Fees • Profit Fees • Withdrawal Fees Get more accurate profit estimates before making a trade. Multi-Outcome Support Supports: • Binary Markets • Three-Outcome Markets • Custom Multi-Outcome Markets Break-Even Analysis Know the minimum spread required to remain profitable after fees and trading costs. Real-Time Results As you modify prices or fees, calculations update instantly with no waiting. Clean & Easy Interface Designed for both beginners and experienced traders with an intuitive interface focused on speed and accuracy. Works Offline Perform calculations anytime without requiring an internet connection. Great For • Prediction Market Traders • Polymarket Users • Event Traders • Arbitrage Traders • Probability Analysts • Crypto Market Participants • Research & Education Whether you're evaluating election markets, sports, economics, crypto events, or other prediction markets, Polymarket Arbitrage Calculator helps you quickly determine if an opportunity is worth taking. Why Use This App? • Fast calculations • Accurate stake distribution • Fee-aware profit estimates • ROI and payout analysis • Multi-outcome support • Simple and intuitive design • Offline functionality Spend less time calculating and more time finding opportunities. **Disclaimer:** This application is an independent calculation tool designed for educational and informational purposes only. It is not affiliated with, endorsed by, or sponsored by Polymarket or any other prediction market platform. Trading and investing involve risk, and calculated results do not guarantee profits. Always verify market information and conduct your own research before making financial decisions.
Written user reviews are not shown here. Check current App Store reviews >
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
Assumption to check: Limited functionality for complex calculations
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Poor user interface and experience
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of user feedback for calculations
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
Not assessed in a Build Kit yet.
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.