SLIP SURGEON
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Free NBA and NFL betting tools

Everything here is free with no account. Model picks, not locks.

Bet slip checker (Slip Surgery)
Screenshot any slip: legs checked against FanDuel and BetMGM, weakest leg found, one-tap load.
Parlay odds calculator
Payout, implied probability, no-vig fair odds and the book's margin for 2 to 12 legs.
Defense vs position
Which NFL and NBA defenses give up the most to each position.
+500 / +1000 Hunter
Cross-game long shots where our model rates every leg better than the price.
NBA player props tonight
Per-game FanDuel lines, model leans and matchup notes.
NFL player props
Per-game FanDuel lines, model leans and matchup notes.

Guides

How to check a parlay before you betHow to fix a parlay with a bad legSame game parlay correlation, explainedHow to read prop odds and implied probabilityWhat is the vig? Finding no-vig fair odds on propsHow many legs should a parlay have?How to load a slip into FanDuel or BetMGM in one tap

Model picks, not locks. No checker can tell you a slip will win; it can only show you the price, the math and what changed. 21+ only. If betting stops being fun, call 1-800-GAMBLER or read our responsible gaming page.