Is There an App That Checks Your Parlay Before You Bet It?
Yes. ET Parlays: Slip Check is on Google Play for Android. You paste or scan an NFL slip, and every leg shows how often it lands at the sportsbooks’ own price, with their cut taken out. On 1,863 NFL player props ET graded in weeks 1 to 5 of 2026, that number said 49.9% on average, and 48.7% landed.
It also names your weakest leg and shows what the whole slip needs to land to break even. It takes no bets, holds no money and makes no picks. You bring the slip.
What you see when you check a slip
- Every leg, as a chance. How often it lands at the books’ price for your exact line. Up to 20 legs a check.
- Your weakest leg. Named only when one sits clearly below the rest, by the chance each leg shows.
- The slip as a whole. The legs combined into one chance, what the slip pays, and what it needs to land to break even. If your paste has no total odds, add a line like “Total odds +1250”.
- A warning on same-game legs. Legs from the same game move together, so the combined number is rough when they share one.
- What happened, the next morning. Save a slip and ET writes up every leg after the games, then sends you a notification. NFL can take a day longer.
- The record. A Record tab shows how ET’s reads have landed this season, band by band, misses included.
One slip, start to finish
Say you paste four NFL legs, each from a different game, each priced -110, each about a coin flip. That is where most main lines sit. Here is what the check shows you, in numbers.
- Each leg lands about 50 times in 100. It misses the other 50.
- All four land about 6 times in 100. Half of a half of a half of a half is 6.25%. It misses about 94 times.
- The slip pays +1228. A $10 slip wins $122.83. To break even at that price it needs to land 7.5 times in 100.
So the slip needs 7.5 and lands about 6. Over 100 slips like it you stake $1,000 and get back about $830. The missing $170 is the books’ cut, taken once on each leg and multiplied four times (the full math is in why parlays lose: the vig stacks). The app puts that gap in front of you before you place the slip, not after.
Why the app shows the books’ number, not ours
For NFL legs the chance in the app is the sportsbooks’, not ET’s. We tested ours first. On the same 1,863 props, ET’s own numbers said 52.6% on average and 48.7% landed. When ET said 70 to 80%, about half landed (201 props). The books’ price, with the cut taken out, came much closer:
| The books said | Props | Average said | Landed |
|---|---|---|---|
| 30 to 40% | 74 | 37.5% | 41.9% |
| 40 to 50% | 682 | 47.6% | 44.1% |
| 50 to 60% | 1,051 | 51.5% | 51.2% |
| 60 to 70% | 56 | 62.7% | 66.1% |
NFL passing, rushing, receiving and reception props, main lines, weeks 1 to 5 of 2026. Each book’s last price before kickoff, cut removed, then the middle of the books. Anytime touchdown is separate, because books post only the yes side and the cut stays in: 1,952 props, said 17.2%, landed 16.5%.
NFL props the sportsbooks priced at 50 to 60%, once their cut was taken out, landed 51.2% of the time, across 1,051 props in weeks 1 to 5 of 2026.
So the app tells you what the market already thinks, plainly, and does the multiplying the books leave to you. Two limits. Five weeks is a short season, and these bands will move. And the app shows the price when you check, which can be days before kickoff. When we graded the earlier price instead, the result barely changed.
What it does not do
- It is not a sportsbook. You place every bet yourself, at a licensed book.
- NFL only, for now. MLB legs get checked on the website, at Slip Check, with no account.
- No iPhone version yet. The web checker works in any phone’s browser.
- It needs an account. You sign in with an ET Parlays account, made on etparlays.com. Scanning a screenshot is part of ET Plus and Pro, 10 a day.
- It cannot tell you a slip will hit. No tool can. It tells you how often slips like yours do.
This is research and education, not betting advice. Bet only what you can afford to lose, keep it 21+, and if it has stopped being fun, there is free help: responsible gambling resources.
Keep going: How do I find the weakest leg in my parlay? · Is my parlay good? · Betting apps that aren’t sportsbooks · All Learn articles
FAQ
Is there an app that checks my parlay before I bet it?
Yes. ET Parlays: Slip Check is on Google Play for Android. You paste or scan an NFL slip and each leg shows how often it lands at the sportsbooks’ own price, with their cut taken out. It names your weakest leg and shows what the whole slip needs to land to break even. It takes no bets.
Can I scan my bet slip with an app?
Yes. In Slip Check you can pick a screenshot of your slip or take a photo of it, and the app reads the legs for you. Scanning is part of ET Plus and Pro, 10 scans a day. Pasting the slip as text works on any account.
How accurate is the Slip Check app?
Each NFL leg shows the sportsbooks’ price with their cut removed. On 1,863 NFL player props ET graded in weeks 1 to 5 of 2026, that number said 49.9% on average and 48.7% landed. Props it put at 50 to 60% landed 51.2% of the time, across 1,051 props.
Is the Slip Check app on iPhone?
Not yet. Until it is, the web checker at etparlays.com/check works in any phone’s browser, with no account, for MLB and NFL player props.
Does the app tell me which parlay to bet?
No. It checks the slip you bring. It never builds a slip or picks legs for you, and it cannot tell you a slip will hit. It shows how likely each leg is, which leg is weakest and what the slip pays against what it needs.
Is Slip Check an AI parlay analyzer?
No. For NFL legs it uses the sportsbooks’ own prices with their cut taken out, and ET publishes how that number has landed, misses included.