# NetArbs > NetArbs compares live odds from 30 sportsbooks and exchanges, removes the vig to find fair odds, and flags +EV player props on PrizePicks, Underdog and more. NetArbs is sports betting analytics software for people who shop lines and bet only when the price is right. ## What it does - **Odds board**: live odds from 30 sportsbooks, exchanges and prediction markets on one screen — moneylines, spreads, totals and player props — with each book's margin removed to show fair odds. - **DFS Studio**: player props on PrizePicks, Underdog, ParlayPlay, Betr, Sleeper, Dabble, DraftKings Pick6 priced against the sharp books; props above the app's break-even are listed with the number of books behind each price. - **Slip builder and bot**: the desktop app builds slips in PrizePicks, Underdog, Betr, Sleeper, DraftKings Pick6 and stops before Submit — the user places every bet. - **Prediction-market arbitrage**: the same contract on Kalshi, Polymarket, Limitless, with fees included. - **Beat the close**: every logged bet is re-priced at its own line until kickoff, to show whether the market moved toward it. ## Coverage - Sports: NFL, college football, NBA, WNBA, college basketball, MLB, NHL, soccer, tennis, esports - Sportsbooks, exchanges and prediction markets: Pinnacle, DraftKings, FanDuel, BetMGM, Caesars, BetOnline, Bet365, Bovada, Hard Rock Bet, Kalshi, Fanatics Markets, Polymarket, Novig, BetRivers, Bally Bet, Betway, Matchbook, MarathonBet, theScore Bet, BetParx, Smarkets, Fliff, ProphetX, Circa Sports, Fanatics Sportsbook, Heritage Sports, Jazz Sports, YouWager, Unibet, Dabble AU - DFS and pick'em apps: PrizePicks, Underdog, ParlayPlay, Betr, Sleeper, Dabble, DraftKings Pick6 ## Free beta - Full access is free while the open beta is active. Create an account, verify your email and download the Mac or Windows app. No card or subscription is required. ## Questions ### What is NetArbs? NetArbs is sports betting analytics software. It compares live odds from 30 sportsbooks, betting exchanges and prediction markets, removes each book's margin (the vig) to estimate fair probabilities, and shows where a price is off the market: +EV player props on DFS pick'em apps, better lines at sportsbooks, and arbitrage between Kalshi, Polymarket and Limitless. ### Which sportsbooks and apps does NetArbs compare? Sportsbooks, exchanges and prediction markets: Pinnacle, DraftKings, FanDuel, BetMGM, Caesars, BetOnline, Bet365, Bovada, Hard Rock Bet, Kalshi, Fanatics Markets, Polymarket, Novig, BetRivers, Bally Bet, Betway, Matchbook, MarathonBet, theScore Bet, BetParx, Smarkets, Fliff, ProphetX, Circa Sports, Fanatics Sportsbook, Heritage Sports, Jazz Sports, YouWager, Unibet and Dabble AU. DFS and pick'em apps: PrizePicks, Underdog, ParlayPlay, Betr, Sleeper, Dabble and DraftKings Pick6. ### Which sports does it cover? NFL, college football, NBA, WNBA, college basketball, MLB, NHL, soccer, tennis and esports — game lines and player props where the books post them. ### How does NetArbs find +EV player props? For each prop it takes the sharp books' prices on the same player, stat and line, removes their margin to get a fair probability, and compares that with the break-even the DFS app's payout requires. Props above break-even are listed in DFS Studio, each with the number of books behind its price. ### Does NetArbs place bets for me? No. The NetArbs desktop app can build a slip in your PrizePicks, Underdog, Betr, Sleeper and DraftKings Pick6 account, but it always stops before Submit: you review the slip and place it yourself. ### How much does NetArbs cost? NetArbs is free during open beta. Create an account, verify your email and download the desktop app without a card. Beta access includes every feature and does not start a subscription. ### Can I use it on Mac and Windows? Yes. NetArbs runs in the browser, and there is a desktop app for macOS and Windows; the slip-building bot runs in the desktop app. ### Does NetArbs guarantee winning bets? No. NetArbs is a research and price-comparison tool. It shows where books disagree with the market; it does not predict outcomes, and every bet carries risk. Bet only where it is legal for you. ## Links - [Home](https://netarbs.com/) - [Free odds board](https://netarbs.com/odds): moneylines, spreads and totals from the big US sportsbooks, refreshed every 10 minutes, no account needed - [NFL odds](https://netarbs.com/odds/nfl) - [NBA odds](https://netarbs.com/odds/nba) - [NHL odds](https://netarbs.com/odds/nhl) - [MLB odds](https://netarbs.com/odds/mlb) - [College Football odds](https://netarbs.com/odds/college-football) - [College Basketball odds](https://netarbs.com/odds/college-basketball) - [WNBA odds](https://netarbs.com/odds/wnba) - [Learning center](https://netarbs.com/learn): worked examples for sportsbook odds, DFS props and prediction markets - [How to remove sportsbook vig from odds](https://netarbs.com/learn/remove-sportsbook-vig): A worked no-vig probability example, the limits of a two-way model, and how NetArbs uses fair prices to compare books. - [What makes a bet positive expected value?](https://netarbs.com/learn/positive-expected-value-bets): Calculate break-even probability and expected value from a price, then see why a model edge still needs fresh lines and enough market support. - [How to price DFS pick’em player props](https://netarbs.com/learn/dfs-pickem-prop-pricing): Compare a pick’em prop with matching sportsbook lines, remove the vig, and account for the app’s payout and slip structure. - [Kalshi and Polymarket arbitrage: a practical checklist](https://netarbs.com/learn/kalshi-polymarket-arbitrage): Understand paired YES/NO prices, exchange fees, settlement mismatch, liquidity and execution risk before treating a spread as arbitrage. - [How it works](https://netarbs.com/how-it-works): line shopping, removing the vig, +EV against a pick'em app's break-even, closing-line value - [Pricing](https://netarbs.com/pricing) - [FAQ and betting terms](https://netarbs.com/faq) - [Desktop app for macOS and Windows](https://netarbs.com/download) - [Privacy](https://netarbs.com/privacy) - [Full text for AI assistants](https://netarbs.com/llms-full.txt) NetArbs is a research and price-comparison tool. It does not predict outcomes or guarantee winnings; bet only where it is legal for you.