Analytics
ExampleThis month by date placed
+$1,240
Today +$86 3 bets
Personal stats on the left, the profit chart in the center, tags and per-sportsbook vig on the right. Same arrangement as Analytics.
Free bet tracker
Track every bet. Leave the spreadsheet.
VigStamp is free. Log slips from any sportsbook with a screenshot or the Chrome extension — American or decimal — with the odds converter on the same screen. No book password, and no paid login sync.
Optional: connect Kalshi or Polymarket in Settings. Sync open + history pulls open positions and past bets when the exchange API provides them. Keys stay in this browser.
Example
A look at the tracker
Sample numbers. Analytics is personal stats, a blue profit line with a green fill, and tags with per-sportsbook vig. History keeps each sub account on the right, apart from the main slips. The odds converter reads a Kalshi price in cents. No sign-in needed to see this.
Results calendar
ExampleSeptember
+$840 ROI +12%
Blue days are wins. Coral days are losses. Same calendar you get in the tracker.
Books and capture
ExampleOn the slip and in the extension
PowerPlay
Stake
1xBet
Betway
PlayNow
Mise-o-jeu+
Proline
TonyBet
ToonieBet
Sports Interaction
BET99
Pinnacle
Betano
Unibet
Betfair
William Hill
Paddy Power
Betsson
Tipico
bwin
Superbet
LeoVegas
Betclic
Snai
Toolbar summary
Bets this week
8
Wagered
$240
Net this week
+$42
The Chrome toolbar opens this summary from your own record. Capture slip still reads the sportsbook page.
On each book
Sub accounts
Four labels under one sportsbook. They sort slips. They do not split that book's balance, deposits, or profit. A book with none works as before. Chasing steam is a tag, not one of these labels.
DraftKings
Main
Everyday slips on the account you use most.
Sub 1
A second login on the same book, kept as its own list.
Bonus
Promo and boosted slips, separate from the main list.
Live
In-game bets you want to see on their own.
Add them in Settings
On that book's card, type a name and add it. Rename or delete it there too.
Pick one on the slip
Sub accountBonus
The picker shows once the book has a sub. None stays the default.
See the name on the bet
Home, History, and the slip detail show the label next to the book.
See them on History
Sub accountLive
The right side totals Main against every label. Pick a row and the list shows only that pile.
History
On the rightFalcons vs PackersBonus+$18
Bills −2.5Bonus−$8
Same panel as History. Bonus is selected, so the list shows only that label. Main stays the slips with no label, and picking it shows those instead. Chasing a number is a tag named Steam, not a sub account.
New slip
On the form
American
−233
Decimal
1.43
Commission
Kalshi
Polymarket
Polymarket US
ProphetX
Novig
Kalshi, 100 contracts at 50¢ · $1.75. Polymarket sports is $1.25, Polymarket US is $1.74. The dollar amount is stored on the slip.
No on “Packers wins by over 4.5” is the other team +4.5. Yes on that line is Packers −4.5. A 70¢ price is −233.
70¢, 70%, and −233 are the same price. Decimal 1.43 sits with them. The converter loads with New slip, including when there is no screenshot.
Download the Chrome extension
Capture stays on the sportsbook tab. A clear slip saves on its own. If the read is shaky, Add Bet opens with the fields filled so you can confirm. JSON download is only a backup if that handoff fails.
Download Chrome extension- Download vigstamp-slip-capture.zip over HTTPS from
https://raw.githubusercontent.com/trustLUC/vigstamp/main/vigstamp-slip-capture.zip. The github.io copy redirects tohttp://vigstamp.com, which Chrome treats as a dangerous file. This raw URL stays on HTTPS. A second copy is often saved as vigstamp-slip-capture (1).zip. - Unzip it once. On Mac, double-click the zip. On Windows, right-click and choose Extract All.
- Open the folder unzipping created.
manifest.jsonshould be directly inside it, besidebackground.jsandREADME.md. That folder is usually vigstamp-slip-capture, or vigstamp-slip-capture (1) when a folder with the first name already exists. - When
manifest.jsonis one level down, open that inner folder. Load unpacked uses the folder that containsmanifest.json. - In Chrome, open Extensions (
chrome://extensions), turn on Developer mode, click Load unpacked, and select that folder.
The zip contains JavaScript, CSS, PNG icons, and a README — no executables. The button uses https://raw.githubusercontent.com/trustLUC/vigstamp/main/vigstamp-slip-capture.zip, which responds 200 over HTTPS as application/zip and does not redirect to HTTP. Load unpacked is enough. A Web Store listing is optional.
Try Capture on a sportsbook
Load the extension, open any sportsbook site where you can see a bet slip, confirm the sportsbook, then use Select area (or Full tab). A clear slip saves on its own. If the read is shaky, Add Bet opens so you can confirm.
Capture works on any http or https site. You stay logged into your own sportsbook in Chrome. VigStamp never gets sportsbook passwords.
Running profit chart
Personal stats on the left, a blue profit line with a green fill in the center, and tags with per-sportsbook vig on the right. Day, 7 days, month, year, or all time.
Sub accounts
Name labels under one book — Main, Sub 1, Bonus, Live. History puts their profit on the right, apart from the main slips. Pick a row to see only that pile. Chasing steam is a tag, already in the default list. The book's balance stays one number.
Odds converter
It loads with New slip, including when there is no screenshot. Percent, Kalshi cents, American, decimal, and fractional. 70¢ is 70% and −233. Site blue on white, and navy in dark mode.
Kalshi and Polymarket
A screenshot in cents becomes American odds. Yes on a team is that moneyline. No on “wins by over 4.5” is the other team +4.5. The printed fee is stored on the slip.
Decimal odds
Overseas prices can be typed as decimal. 1.91 becomes −110, and 2.50 becomes +150. The saved slip still stores American odds.
Any sportsbook
Screenshot a slip or capture it with the Chrome extension. DraftKings, FanDuel, and Heritage cards fill the form, and overseas books from Pinnacle and Betfair to PlayNow and Mise-o-jeu+ are on the list. The read stays in your browser.
Auto-grade, free
ESPN’s public scoreboards settle moneylines, spreads, and totals. Common player props can auto-settle from box scores when the player and market match. Closing prices on those markets are saved once the game has started.
Calendar
The month is the first thing you see, with profit and ROI together and a day-by-day record. Blue days are wins. Coral days are losses.
Capture summary
The extension toolbar shows bets today, this week, and this month, plus wagered and net this week, from the record already on this browser.
Coming from Google Sheets or Excel? Open the tracker, then Settings → Backup → Import CSV. The column names and how-to are on that screen.