Levels allows HR departments to post their actual salary bands, which they're normally more than happy to do. So you're not just relying on user reported data.

Levels allows HR departments to post their actual salary bands, which they're normally more than happy to do. So you're not just relying on user reported data. They're also incentivized to do it because they want compensation benchmarking information (big companies want to know how much their competitors are paying so they can calibrate their own bands to market rate). https://www.levels.fyi/offerings/ https://www.levels.fyi/offerings/ They also have users upload W2s, offer letters, and supporting documents in addition to proof of identity. https://www.levels.fyi/verified/ https://www.levels.fyi/verified/ They have their own job advertisement business and they partner with third party recruiting companies to get anonymous data about offers candidates receive. They also just take having accurate compensation information seriously so they do things like outlier and forgery detection as well as seeming to have a much better algorithm for processing the information they receive.