Stack your edges.
Score the slip.
Every leg graded for EV. The whole slip scored 0 to 100 by ThunderScore. Correlation warnings on same-game legs. Auto-generate by risk profile.
From legs to a scored slip
Pull legs from any +EV source, let the builder grade them in real time, then save the slip to your tracker.
Built for smarter parlays
Most parlay tools just multiply odds. This one tells you whether the slip is actually worth taking.
ThunderScore
A single 0-to-100 number that tells you if the slip is worth the click. Combines per-leg EV, signal agreement, and correlation into one rating.
Correlation warnings
Two legs from the same game trigger an inline warning. Some books void correlated parlays automatically. The builder catches it before you place the bet.
Auto-generate by risk
Pick a risk profile, sport, and leg count. The builder pulls the highest-rated +EV legs that fit and stitches the slip for you. Three profiles, three appetites.
Every leg, +EV
Negative-EV legs drag the whole slip down even when they feel right. Each leg shows its EV against Pinnacle so you can swap or remove anything that's not earning its spot.
Frequently asked questions
ThunderScore is a 0 to 100 rating of your entire parlay slip. It factors in the EV of each leg, whether sharp signals agree on the picks, and any correlation between legs. Above 70 is green and considered strong. 40 to 69 is yellow and worth a second look. Below 40 is red and the slip likely has a negative-EV leg dragging it down.
Pinnacle's no-vig price is treated as the fair line for each leg. We compare the price you'd actually take against that fair price and surface the percentage difference. A leg at +3.8% means the book is offering 3.8% better than fair. Combined EV is the math on the entire slip, not just an average of legs.
If two or more legs come from the same game (for example, Lakers spread + Lakers Over), the builder shows a yellow warning. Some sportsbooks void correlated parlays automatically; others leave them but the math gets distorted. The warning lets you check the book's rules before placing.
Pick a risk profile (Conservative, Balanced, or Aggressive), a sport, and a leg count. The builder pulls the highest-rated +EV legs that match your profile and stitches them into a slip. Conservative caps at 3 legs and only uses the highest-conviction picks; Aggressive goes up to 6 legs for bigger payouts.
Parlay payouts compound, but so does the math against you. A negative-EV leg multiplies its losses across every other leg in the slip. Building only with +EV legs is the only way for a parlay to have a positive theoretical return. The 2-to-3 leg sweet spot keeps variance manageable while still amplifying edge.
Build a parlay worth taking
Stop stacking longshots and start stacking edges. Every leg measured, the whole slip scored.