Which is better Intelius or TruthFinder?

In terms of costs, its better to choose Intelius if you only need a few results about someones background because it is possible to purchase people search reports for a lower, one-off fee, while TruthFinder is the better option for those who wish to run several complete background checks.

Can you tell if someone does a background check on you?

The easiest way to know whether someone has run a background check on you is to hear it from them directly. Background checks are most common in the hiring process. When running a background check, an employer is beholden to the Fair Credit Reporting Act, or FCRA.