Depends where you're comparing them to in the US but in general most European tech wages are lower than the US. If comparing to SF perhaps even shockingly lower.

It can be hard to swallow at first, but when you account for lower rent, much cheaper health insurance, and far more vacation days (~20-24 by law - and no one actually expects you to be available) along with safer cities with generally higher quality of life, in my opinion it ends up being a very, very good trade off.

I moved to Amsterdam some years back (and have worked for a Berlin based company) and don't know if I could ever move back to the states.