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.
Kalshi is the largest legal and federally regulated prediction market app in the U.S., where you can make money by predicting real-world events, including soccer, baseball, golf, and other sports
Free · In-app purchases
Evidence scope: #7 is the current overall US Free chart position. 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.
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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 Kalshi: Trade Football & more: 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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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: Users find it difficult to navigate between events and trades.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited educational resources for new users.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Some users report slow performance during peak times.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchases can be confusing.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Kalshi is the largest legal and federally regulated prediction market app in the U.S., where you can make money by predicting real-world events, including soccer, baseball, golf, and other sports. Trade real outcomes in a federally regulated prediction market. Perfect for sports trading, event trading, forecasting, futures-style markets, and real-world predictions. It’s like trading stocks — but instead, you trade on events you understand. Predict whether an event will happen or not, and earn money if you’re right. Join 10M+ users trading thousands of prediction markets across finance, weather, culture, sports, and more. FINANCIAL MARKETS Daily S&P 500, Nasdaq 100, WTI oil ECONOMIC MARKETS Fed interest rates, Inflation (CPI), GDP, Recession, Gas prices, Mortgage rates CLIMATE MARKETS Hurricane strength, Daily city temperatures, Tornado numbers CULTURE MARKETS Billboard 100, Oscars, Grammys, Emmys, #1 Hits HOW KALSHI WORKS Kalshi is the largest federally regulated prediction exchange where you buy and sell contracts based on event outcomes. Example: NASA announces a manned mission to the moon. Contract prices reflect trader probability estimates. If you think the event will happen, you buy contracts. Contracts cost between 1¢ and 99¢ and can be sold anytime. At market close, each correct contract is worth $1. TRADE SPORTS Kalshi lets you trade on real sports outcomes across football, baseball, basketball, golf, MMA, tennis, and more. Trade pro and college sports with highly liquid prediction markets. HOW IS KALSHI REGULATED? Kalshi is federally regulated as a Designated Contract Market (DCM) by the Commodity Futures Trading Commission (CFTC). Kalshi’s affiliate, Kalshi Klear LLC, is a CFTC-regulated clearinghouse that holds member funds and clears trades. TRADE YOUR CONVICTIONS Find prediction markets that match your views. If you think a recession is coming, trade recession and S&P markets. Put your money behind your forecasts. REDUCE FINANCIAL RISK Hedge against events that could impact your finances. If you hold stocks, trade Fed and inflation markets to help protect your portfolio. KALSHI VS. STOCKS Event contracts are direct. You trade the outcome of an event, not the future stock price of a company. Profits are not tied to company performance. No pattern day trading restrictions. Trade as much or as little as you want, anytime. In stock trading, you can be right and still lose money due to market sentiment or news. Prediction markets remove that layer. KALSHI VS. OPTIONS Event contracts are simpler. Options pricing depends on multiple complex factors. Kalshi contracts reflect straightforward event probabilities. No time decay. If the event odds stay the same, contract value stays stable. HOW MUCH MONEY DO I NEED TO START? Open and maintain a Kalshi account for free. Prediction markets require less capital than traditional trading, making it easier to diversify without risking large amounts. ADVANCED TOOLS & API ACCESS Build trading algorithms in Python with starter code and a dedicated package. Start in minutes with documentation. Access open-source tools from the Kalshi developer community. 18+ only. Restrictions and eligibility requirements apply. Trading event contracts and trading leveraged products, including perpetual futures, involves significant risk and is not appropriate for everyone. Please carefully consider if it is appropriate for you in light of your personal financial circumstances. Kalshi products are not available in all jurisdictions. See kalshi.com/regulatory for more information. Additional perpetual contract offerings are subject to applicable regulatory review and approval, and availability may vary. Leverage amplifies both potential gains and potential losses, and losses can exceed the amount deposited. Leverage limits are determined by KalshiEX LLC or the FCM based on its own risk assessment and each customer's individual risk profile, and are subject to change.
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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.
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.