Check the bet before you place it.
Paste up to six MLB or NFL player props from any sportsbook. ET checks each leg against the data, grades the slip, and shows you what deserves a second look.
How accurate have these grades been?
On September 10, 2026, ET started lowering the numbers it shows to what its record supports. Since then it has graded 1,525 MLB board reads written before first pitch, through October 4, 2026. Misses stay in the count. Two weeks of games is a short record, so treat each row as a first look.
| ET said | Reads | Average | Landed |
|---|---|---|---|
| 0 to 20% | 361 | 17% | 19% |
| 20 to 40% | 441 | 37% | 35% |
| 40 to 60% | 428 | 49% | 45% |
| 60 to 80% | 295 | 63% | 60% |
Average is what ET said on average inside each band. Bands with fewer than 30 graded reads are left out.
Before September 10 the numbers ran high: reads that said 80 to 90% landed about 63% of the time. See every graded read since April 14, market by market →
Questions
How do I check if my parlay will hit?
No tool can tell you it will. What you can check is how likely each leg is, which leg is weakest, and how much the whole slip needs to go right. Paste your legs above: each gets a letter, MLB legs show how often that letter has landed before, and the graded legs combine into one chance for the slip.
Is this parlay checker free?
Yes. You need no account and no card. You can paste up to 6 MLB or NFL player props per check, 5 checks a day per connection. It is not a sportsbook and takes no bets.
How accurate have ET’s grades been?
Since September 10, 2026, ET has graded 1,525 MLB board reads written before first pitch. In the biggest group, it said 20 to 40% (about 37% on average) and 35% landed. Before that date the numbers ran high: reads that said 80 to 90% landed about 63% of the time. You can see every graded read since April 14, market by market, on the page about whether betting prediction apps are accurate.
Which leg of my parlay is the weakest?
Slip Check names a leg only when it sits clearly below every other leg on your slip: MLB legs by ET’s number, NFL legs by their price. If none of your legs stands out, it tells you so instead of guessing. Usually your weakest leg is the one with the longest price.
Is this an AI parlay analyzer?
No. ET uses statistical models graded against what actually happened, and it shows how often its numbers have landed, misses included.
Why is one of my legs not graded?
The free checker grades the top of each MLB market on today’s board and covered NFL player props before kickoff. Early in the NFL season some players stay ungraded until their own games carry the read, and anytime touchdown letters are held for now. When you sign in as a member, you get the full pool.