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Langbot vs AltIndex

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Langbot compared with AltIndex
DetailLangbot logo LangbotAltIndex logo AltIndex
What it doesData and simulation layer for prediction markets on Kalshi and Polymarket Alternative data and AI for smarter stock investing
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFreemium Freemium
PricingFree ($0/month) with 60-second delay on live data, 60 API requests/minute, 1 concurrent stream, 5 subscriptions, 20 sim runs/month; Builder ($49/month) with 10-second delay, 600 requests/minute, 5 streams, 25 subscriptions, 100 sim runs/month; Standard ($199/month) with 2-second delay, 3,000 request Platform: Starter $29/month or $199/year (save $149); Pro $99/month or $499/year (save $689). API: Hobbyist $19/month or $120/year (save $108); Developer $79/month or $480/year (save $468); Research $199/month or $1,200/year (save $1,188); Enterprise custom pricing.
Key features
  • Order-book history with outcomes and rules for every market on Kalshi and Polymarket
  • Live context synchronized on one clock: speech, official text and data releases
  • Simulator with venue's real fees and timing for backtesting
  • Full REST, WebSocket and SSE access with signed webhooks
  • Python and TypeScript SDKs and CLI for programmatic access
  • MCP server with phrase and market subscription tools
  • Fair-value and live probability models for markets
  • Signed receipts and provenance reports for evidence
  • Paper trading mode on live record before switching to real exchange keys
  • Timestamped facts for resolved market outcomes with speaker attribution
  • Portfolio AI scoring from 0-100 for each holding
  • Real-time stock alerts on alternative data signals
  • AI-powered stock picks updated daily
  • AI chat analyst for portfolio questions
  • Autopilot rules-based portfolio copying
  • Stock screener with filters and export
  • Mobile app with push notifications and sync
  • API and MCP server for AI tools integration
  • Portfolio leaderboard ranking system
  • Market news and research insights
What makes it different
  • Synchronized context on the same clock: order books, market rules, and every speech or data release that moves prices
  • Speaker attribution and verdict for each phrase: whether it counts under market rules
  • Live recording of order books for every open market rolling out
  • No trading signals: users control all decisions and trades with their own exchange keys
  • Analyzes alternative data that hedge funds pay millions for
  • 61% win rate across AI stock picks
  • Portfolio import from any brokerage with just a screenshot
  • AI answers grounded in real data, never made-up numbers
  • Freemium access to premium features
Community votes01
DR (Domain Rating by Ahrefs)Not checked yet no change since last check62 no change since last check
Trust Flow (Majestic)013
Citation Flow (Majestic)042
Referring domains (Majestic)0955

5 details filled in for both companies.

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