A number websites provide odds comparisons for many of the online bookmakers. Such websites allow the punter to determine where the best odds are available for a particular match and whether any arbitrage opportunities exist where value odds can be found for each match outcome at different bookmakers. An arbitrage or sure bet opportunity arises when it is possible to bet on all three match outcomes at different bookmakers to guarentee a profit.

AsianOdds
Asianodds.org is a website that gives you the ability to watch live the lines, the odds and their changes in asian betting market.

Best Betting
Powered by Bet Genius bestbetting.com finds the best odds available from a variaety of bookmakers for a ranges of specialised bets, including double result, correct score and first goal scorer, in addition to the more traditional 1X2 odds comparisons. You can choose between British (fractional) and European (decimal) odds, and also switch between showing the full range of prices for each selection and showing just the best prices.

BetBase
A superb site with odds comparisions for 51 bookmakers and 233 football competitions!! Uniquely, this odds comparision service allows analysis of team form at the same time as comparing odds for a particular game - quite invaluable!!

BetBrain
An invaluable tool to increase betting profits (or at least minimise losses) that allows you to compare the odds available for many European football matches with all the reputable online bookmakers. If you're a punter with multiple accounts don't place a bet before checking BetBrain's comparisons.

BetExplorer
Comparing odds from nearly 90 bookmakers and publishing them side by side with matchups stats.

Betting Odds
Sports betting odds comparison.

Betting Odds
A sports odds comparison free from banner advertising.

Book Odds
Follows spreads and odds changes in real time on the Asian handicap market for the most popular sports.

Check Best Odds
An odds comparison for more than 25 bookmakers, with surebets and dropping odds.

Check Your Odds
Odds comparison service for a variety of sports.

Joly Odds
An odds comparison site designed to have the look and feel of a bookie, on offer is a range of bookies, sports and bet types. All these bet types can also be easily added to the bet slip to show which bookmaker offers the best multiple bet odds.

Live Best Odds
Sport website for odds comparison, dropping odds, sure bets, livescore, sport statistics and more.

Live Football Betting
Live football odds comparison, predictions and tips.

Odds1X2
A soccer odds comparison service with a clean and simple interface to give the user what they want as fast as possible. All major leagues in Europe are covered and updated 24/7.

Odds4Free
A useful football odds comparison site with a tool to compare odds for multiple bets.

OddsExplorer
OddsExplorer is an online odds comparison service that finds the best odds from more then 80 online betting bookmakers.

Odds Math
Odds comparison, dropping odds and betting tips.

OddsOddsOdds.Com
A new and easy to use odds comparison service from wettforum.info with odds for football, tennis, ice hockey, basketball, american football and handball. Available in English or German.

OddsPortal
Compare betting odds from 50+ major bookmakers and create a coupon and find the bookmaker offering highest odds on your multi-bet for a range of sports.

OddStorm
Fast odds comparison and arbitrage services, with Real Time Bookmaker's Odds, Real Time Odds Changes, Odds Comparison Service, Actual Asian Lines and Unique Sports Arbitrages.

Oranara
OranAra.com gives you up to date betting odds from all major online bookmakers, dropping odds tool, surebet calculator and hot volumes service. Also running a tipping competition with €1,500 in monthly prizes since 2013.

Quick Odds
Qodds compares odds from up to 49 bookmakers for football, tennis, basketball, snooker and boxing. More sports and bookmakers will be added over the coming months.

Search4Bets
Odds Comparison and analysis for all the major sports worldwide.

SportsPunter
Website featuring a betting odds comparison from sportsbooks around the world as well as online betting statistics and computer predictions.

Wett Portal
A sports odds comparison with sure and value bets, available in English, German, Danish and Russian.