Ask five apps for a star guard's points line tonight and you can get five answers: 22.5, 23, 23.5, 24, 24.5. They can't all be right. Line shopping — comparing every version of a line before you play one — is the oldest edge in betting, and DFS pick'em made it bigger, not smaller.
Why the gaps exist
- Independent pricing. Every app runs its own models and moves on its own schedule. Injury news hits one app minutes before another.
- Different customer bases. Apps shade lines toward what their users like to play — popular overs get more expensive, unpopular markets go stale.
- Coverage breadth. Niche markets (esports kill lines, tennis games won, golf bogeys) get less attention and drift furthest from fair.
The reference point: a de-vigged consensus
A single sportsbook's odds contain vig — the built-in margin. Remove it and you recover the book's honest probability estimate. Do that across 20+ books, weight the sharpest ones highest, and you get a consensus fair line that outpredicts any individual source. That consensus is the yardstick every DFS line gets measured against.
From gap to EV
When an app hangs 22.5 and the consensus says the fair line is 24, the over on that app is mispriced in your favor — and the size of the gap converts directly into EV%. Doing this by hand for one player takes minutes; doing it for every player on every app all day is the part that used to be impossible. That is the part AutoDFS automates.
Shopping the payout, not just the line
The second half of line shopping is the payout side: the same 58% leg is worth more in a structure that breaks even at 55% than one that needs 57.7%. The full comparison — fair probability vs. this app's structure — is what the EV% number already contains.