Short of finding a way to see your opponents cards, I wouldn't really say it was possible to cheat at poker. This service is just one step beyond the many odds calculator apps that are available already - would you consider those cheating, too?
So yes, I consider it cheating.
If you couldn't get away with it in a real game at a table, it's cheating IMO.
Part of the skill of poker is being able to work out those odds in real time, when money is on the line.