Linewhale

Line Whale is a sports betting odds comparison platform built for bettors who want the best price on every wager. It pulls real-time lines from major US sportsbooks and prediction markets like Polymarket and Kalshi into a single odds grid, so you can shop a line across every book at once instead of checking each app individually. Beyond basic comparison, it includes a suite of edge-finding tools — a Middle Finder and Arbitrage Finder for locking in guaranteed or near-guaranteed profit, a +EV Finder for spotting mispriced lines, and Steam Moves tracking to catch sharp line movement as it happens — along with full line-movement history for every game so you can see how a market got to where it is. The core odds comparison is free, with premium tiers unlocking the deeper tools.