I`m talking not only about analyze but about different ways of getting profit from sport betting. We can compare odds that different bookies give us on one event. Sometimes one bookie gives w1 odd 4(for example), and another bookie gives x2 odd 5. So we can get profit anyway if we bet both. But you can`t search online such mistakes manually. And there are other ways to get profit that need software.
So if we are talking only about prediction - we don`t need any software - just internet and lots of free time.
You are referring to arbitrage betting, and no, it's hard to win with that kind of betting if you don't have a decent amount of bankroll. Don't expect to get a difference of at least +100... maybe 1 to 5% is already a good difference that you can exploit. It does not have risk, but it's time-consuming if you don't have enough capital, so I suggest you fulfill that first if you want to try this. Of course, there's a system for doing it as manually can be more like a waste of time, and you won't be able to find the best arbitrage opportunities.
I think there's also risk with arbitrage betting, house might detect you from doing it and they can freeze your account, as we know gambling is a business and not a cash-cow for gambler, once they find you doing this type of gambling they will tag you doing a suspicious kind of betting and there you go it's against the terms and conditions.
And it's true the difference is just a little percentage, but if you have that time and you are willing to take the risk knowing what are the possibilities once you succeed in cashing out your winning then it's good to go.