Culture Amp is well established as a modern employee mood/ culture measurement platform. They offer a combination of pulse surveys, deep dives combined with strong analytical and reporting capabilities. Strong list of clients.
Look and Feel?
Modern, state of the art.
Extensive offering, innovations are difficult to judge.
Easy to implement?
Will take considerable time and effort
Culture Amp (founded 2009) seems to be a good choice if you are serious about measuring if your people are amplifying the culture, and if you want a broad range of tools (pulse, deep dive, personal feedback). We also like the ability to measure in the different phases of the employee journey. Supports multiple languages.