301440 odds checker and comparison

Looking for software development whereby searches can be made of 20 or so specified sites and compare betting odds for particular events, similar to [login to view URL] Easy to use interface. Software to search simultaneously and alert user when lower odds found with one company compared to another. Software to determine when percentages provide an arbitrage of a two, three or four event outcome thus finding arbitrage opportunities. Easy to use online apps system. Able to work with fractions and decimals.