Questions
NetArbs
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.
Betting terms
What is the vig?
The vig (also vigorish, juice or margin) is the bookmaker's built-in edge. At -110 on both sides each side implies 52.4%, 104.8% in total; the 4.8% over 100% is the vig.
What are no-vig fair odds?
The odds left after the vig is removed: the probabilities a market implies once they add up to 100%. On -110/-110 both sides are 50%. On -150/+130 the favourite is 58.0% by the multiplicative method and 58.4% by the power method.
What is a +EV bet?
A bet whose price pays more than its fair probability warrants, so it wins money on average over many bets. On a pick'em app, a leg whose fair probability is above the app's break-even hit rate.
What is line shopping?
Comparing the same bet across sportsbooks and taking the best price. NetArbs's odds board shows 30 books, exchanges and prediction markets side by side.
What is closing-line value (CLV)?
How much better your price was than the market's last price before the game started. Consistently beating the close is the best early sign that bets are +EV.
Is the free odds board real time?
No. The free board shows DraftKings, FanDuel, BetMGM, Caesars, Bet365, BetRivers, Hard Rock Bet and Fanatics Sportsbook and is refreshed every 10 minutes. Real-time odds from all 30 books, fair odds with the vig removed and the +EV lists are in the app, with a 7-day free trial.
The method behind the numbers: how it works.