Better lines, automatically
Every page, the best price visible at a glance.
The free alternative to paid odds-comparison tools
Pro-grade line shopping without the subscription.
Compare 88+ sportsbooks in real time. Overlay the best price on the sites you already use. No trial wall, no credit card, no monthly fee.
Install Free ExtensionFree forever · No credit card · No trial wall
Interactive preview: drag the slider to compare the same odds without OddsGuard(greyed out) versus with OddsGuard's live savings badges on every better price.
Lakers ML · NBA · Tonight
Your book
DraftKings
-115
Better lines hidden. Install to reveal
You may be leaving money on the table
Lakers ML · NBA · Tonight
Your book
DraftKings
-115
Best available
FanDuel
+135
Extra on a $100 bet
The problem
Line shopping without the headache.
- You open six tabs just to find one line.
- You miss closing line value while switching apps.
- You paid for a dashboard you open twice a week.
- You can't tell whether the line you took was actually good.
Why it matters
Paid tools put the market behind a paywall and make you open another dashboard. OddsGuard runs where you already bet and costs nothing. Because the affiliate economy pays for it, not you.
Same market data. Zero subscription.
The solution
The transparency layer for the books you already use.
OddsGuard runs quietly inside the sportsbook sites you visit and shows the best available price for every line, so you never have to switch tabs to check.
- Compares 88+ price sources in under a second.
- Overlays 52+ sportsbook sites. No extra tabs.
- Flags stale lines and better prices before you commit.
- Runs locally. No betting data collected. No account required.
How OddsGuard pays for itself
Two badges. Real money saved on every bet.
Like Honey at checkout, but for your lines. Two on-page badges do the heavy lifting so you stop overpaying and stop missing +EV plays. Every bet, every page, every sportsbook we cover.
Hidden dollars: Save on every bet
We shop the lines so you don't have to.
Five tiers, Minimal to Fire. Whichever sportsbook has the better line, you see exactly how much you would save before you click bet.
+EV: Bet sharper
We do the math so you get the edge.
We compare every line to the de-vigged consensus across 52+ books. If a bet is priced better than fair value, you get a +EV badge. No spreadsheets, no math.
Live demo
See it working on real odds.
This is the extension running on live data. Switch books, change sports, and watch the best price update in real time.
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How it works
Install once. Better lines, forever.
Install the extension
Chrome, Edge, Firefox, or Safari. We'll detect your browser and ship the right one.
Open your sportsbook
OddsGuard activates on the 52+ supported sites. Everywhere else it stays out of your way.
See the better price
Our overlay shows the best available line from the market, inline, on every bet.
Life after install
What changes the first week you install.
Free forever
Supported by affiliate partnerships, just like the travel and shopping sites you already use. We earn the same whichever book you pick.
Private by design
No account required. Works locally on your device. We don't track what you bet.
Works where you bet
Works where you already bet.
52+ sportsbook sites supported. 88+ price-comparison sources feeding the market.
What line shoppers are saying
Join 1,000s of Smarter Line Shoppers
14 5-star reviews from line shoppers using OddsGuard today.
Common questions
Answers to the stuff that usually stops you.
How is this actually free when the other guys charge $50+/month?
We earn affiliate commissions from sportsbooks when users sign up through our links, the same way travel and shopping comparison sites work. You pay the same whichever book you pick; we earn the same whichever book you pick.
Is OddsGuard really free?
Yes. The comparison product is free forever. We earn affiliate commissions from sportsbooks, the same way travel and shopping sites do. You pay the same whichever book you pick; we earn the same whichever book you pick.
Do I need an account?
No account required to use the extension. You need accounts with the individual sportsbooks to actually place bets. OddsGuard never accepts or places wagers.
Will it slow down my browser?
The extension only loads on supported sportsbook sites. Everywhere else it does nothing. No background polling on random pages.
Do you see my bets or my account data?
No. OddsGuard runs locally on your device, reads the public odds on the page, and compares them to the market. It does not read account balances, bet history, or personal data.
Which sportsbooks does it work on?
Most major US and international books. See the full supported list at our home page bookmaker section. The list updates as we add new adapters.
More in our full FAQ.
Switch from a paid tool. Free forever.
88+ books compared in real time. 52+ sportsbook sites overlaid. One extension.
Switch freeFree forever · No credit card · No trial wall
Already protecting bettors across every major book
Where the price-shopping money is, broken down
Pre-match
Where the smart money sets the line
Live · in-play right now
Mispriced quotes that move every second
Compound your edge
What line-shopping every leg means on a $100 stake (or local-currency equivalent)
Best-case 4-leg parlay
Best vs lowest book
Extra winnings if every leg hits
Best book
$4,185
Lowest
$3,318
Best-case 5-leg parlay
Best vs lowest book
Extra winnings if every leg hits
Best book
$10,643
Lowest
$7,963
Illustrative mixed-market parlay (avg leg ~2.40 decimal). Real parlays vary; the compounded edge is independent of the base leg odds.
Futures & outrights — where price gaps explode