NetArbs compares live odds from 30 sportsbooks and exchanges, removes the vig, and shows where a price is off the market — +EV player props on PrizePicks, Underdog and more, better lines at the books, and Kalshi–Polymarket arbitrage.
Real spreads are usually far smaller, and only count if both contracts settle on the same event.
What you actually get
Six things the platform does, described plainly.
Every book on one screen
Twenty-plus sportsbooks and DFS apps compared on the same game — moneyline, spreads, totals and player props side by side, so a book that is off the market is obvious instead of something you go hunting for.
Prices with the vig removed
Every line is de-vigged and blended into a consensus before it is shown, so the percentage you read is a fair probability rather than the book’s margin dressed up as one.
Cross-exchange arbitrage
Kalshi, Polymarket and Limitless watched together on the same contract, with fees already priced in — so a spread that survives costs is the only kind you see.
DFS props priced per app
PrizePicks, Underdog, Betr and Sleeper each pay differently — a flat table by pick count, a per-leg boost, a pure multiplier. Each leg is judged against its own app’s break-even, so the numbers are genuinely comparable rather than merely similar-looking.
Esports, including correlation
LoL, CS2, Valorant, Dota 2 and COD line-shopped across the DFS apps — plus same-team correlated pairs for LoL, where a carry’s kills and the support’s assists come off the same play.
Guards against phantom edges
A price only forms a consensus with enough books behind it and enough agreement between them, and an edge too large to be real is dropped rather than shown. Most of what looks like an edge is a stale line — this is what keeps those off the board.
What it deliberately does not do: place bets for you, promise a return, or tell you an outcome is likely because a line moved. It compares prices and shows its working.
Open beta
Try all of NetArbs for free
Create an account, verify your email and download the Mac or Windows app. The odds board, DFS Studio and slip-building bot are included while beta testing is open. No card, checkout or automatic billing.
Practical examples of the math behind sportsbook odds, DFS props and matched prediction markets, including the assumptions that can make a promising number disappear.
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.
Company Information
NetArbs Protocol Group
NetArbs is built by a distributed team of mathematical finance engineers and system architects. We believe in providing open, decentralized analytics tools that level the playing field for prediction market participants.
Our infrastructure runs zero custody code, meaning your private execution details are kept secure on your local workstation.
Need Support?
A dedicated NetArbs support mailbox is being set up. Contact details will appear here when it is ready.
