Web app · Sports
Linevigil
Where the books and Kalshi disagree — watch the gap
Log tonight's sportsbook moneyline, Kalshi's cents and your own read on each game, and Linevigil computes the implied edge per side, charts the path the line took, and explains the fourteen movement patterns. No bets, no book integration, no money — a discipline journal. Free.
Stored in your browser only. Nothing you do in the web version is sent to our servers. Clear your browser data and it's gone — so export a backup from the in-app menu if you want to keep it.
This app is a community proposal.
Try the full browser version now. We build the iPhone and Android app once 100 people upvote it.
We'll email you once, when it ships. Unsubscribe anytime.
In your browser
What you can do in Linevigil on the web
The gap, computed per game
Enter the book's moneyline and Kalshi's last trade and Linevigil converts both to implied cents, shows the spread between them, and highlights anything at or beyond your tradable threshold.
Three prices on one bar
A signature gap bar puts the book's implied probability, Kalshi's cents and your own perceived probability on the same 0–100 scale, with the divergence shaded green or red.
Your edge, both ways
Your probability minus Kalshi's cents is the edge on the yes; your probability minus the book's implied is the edge against the book — plus the fair moneyline your own read implies.
Movement journal with the charted path
Log each line move as it happens — opened −110, −125 by tipoff — flag which pattern you think it is, and both the Kalshi and book-implied paths are charted into the game.
Fourteen line-movement patterns
Reverse line movement, steam, air ball, key-number resistance, buyback, weather and injury moves, lookahead and letdown spots, primetime fade, the Kalshi-versus-book gap, limit moves, totals divergence and the CLV check — searchable, with flag counts from your own journal.
A journal, and only a journal
No sportsbook or exchange integration, no order entry, no automated trading, no real money. Every entry stays in this browser and exports as JSON or CSV.
Screens
Every screen, rebuilt for the browser
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1
Watchlist
The widest gap on the board, the tradable count, a sport filter, and every game as a card with its three prices on the gap bar.
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2
Game
One game's gap, the arithmetic behind it, the charted path of both prices and the movement journal.
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3
Patterns
The fourteen line-movement patterns with what each one signals, searchable, tapped open to read in full.
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4
Moves
Every logged move grouped by game, with the opener-to-latest step and the Kalshi path charted.
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5
Settings
The promises, journal totals, the tradable-spread threshold, JSON and CSV export, sample data and erase.
Try it with sample data: Loads six games across the NBA, NFL, MLB, NHL and college basketball with book and Kalshi prices already diverging, plus thirteen logged line moves — a reverse line move, a steam play, an injury repricing and an air ball — flagged against the pattern library. You can start fresh at any time.
Ready? It's free.
No account, no install, no subscription. Everything you do stays in this browser.
Your say
What should Linevigil do? Tell us before we build it.
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Questions
Is the web version of Linevigil free?+
Yes. Every screen is free to use: no subscription, no in-app purchases, no account.
Do I need an account?+
No. Open Linevigil and start using it right away. Sign in with Google only if you want to upvote an app, save it to your list, or leave a comment.
Where is my data stored?+
Only in this browser's local storage. Nothing you enter is sent to our servers, so we can't see it, back it up, or restore it. Clearing site data, a private window, or another device starts empty. Export a backup from the in-app menu to keep it.
Is there a Linevigil app for iPhone or Android?+
Not yet. Linevigil is a community proposal: the browser version is complete, and we build the iPhone and Android app once 100 people upvote it. Upvoters get one email when it ships.