Are the UML symbols in Gliffy UML 2.5 compliant?

I want to draw UML diagrams using Gliffy, I want to know whether the symbols provided comply with the UML 2.5 specification?

We’ve never checked Gliffy’s UML symbols, unfortunately.

The UML symbols in draw.io are compliant with UML 2.5. You could bring up those and Gliffy’s side by side and check Gliffy’s that way.