Kalshi & Polymarket,
scored side-by-side.
A free, local-first Chrome extension that ranks every active prediction market by edge, spots cross-platform arbitrage, and suggests size with quarter-Kelly. All in your browser. No backend, no account, no paywall.
One popup. Five tools. No fluff.
Open the popup on any market page and the Analyzer runs in milliseconds. Switch tabs to scan or watch — every view stays under your control.
Same-book + cross-platform arbs
Auto-detects when YES + NO ask sums under 100¢ on the same market or across Kalshi/Polymarket. Surfaces both real arbs and near-arbs (where fees might still leave room).
Verdicts with the math shown
Every YES/NO/HOLD comes with expected-value cents, payout breakdown, and a confidence rating that cites why — cross-platform agreement, book depth, spread.
Composite edge scanner
Ranks every active market by liquidity, spread, momentum, sweet-spot pricing, urgency, and arb bonus. Filter to "arbs only" or "movers" with one dropdown.
Real 24-hour price history
Sparkline shows the actual last 24 hours from each platform's candlestick API — not just ticks since you opened the popup.
Background alerts
A 15-minute background scan watches your subscribed markets and fires an OS notification when prices cross your threshold. Click the notification, land on the market.
Settings sync across devices
Watchlist, alert prefs, and bankroll roam between any Chrome profile you sign into. API keys and trading journal stay local on each device.
Install. Open a market. Read the verdict.
Add to Chrome
Free install from the Web Store. No account, no signup — the icon shows up in your toolbar and that's it.
Open any Kalshi or Polymarket market
Click the toolbar icon. The Analyzer pulls live YES/NO from both platforms, scores the market, and tells you what to do.
Subscribe to the ones you care about
One click adds a market to your watchlist. Background alerts fire when prices cross your threshold. Your watchlist syncs across your Chrome profiles.
Local-first by design.
No developer backend. No account on our side. The extension talks directly from your browser to the platforms' own public APIs, and that's it.
- ✓ No developer servers, no telemetry, no analytics
- ✓ Settings + watchlist sync via Chrome's built-in account (Google handles it; the developer can't read it)
- ✓ API keys and the trading journal stay in chrome.storage.local on the device you entered them on
- ✓ Kalshi private keys are used to sign requests locally — never transmitted
- ✓ The only network requests are direct calls from your browser to Kalshi, Polymarket, PredictionHunt (optional), and Google News RSS
Read the full privacy policy · terms of use