I can’t seem to find any information on where the company is from. I’ll try to stick with European software, not necessarily because it’s better or more secure, but out of principle. My experience is that if they don’t mention where it’s from it’s most likely not US :)

What are some good alternatives? Preferably with a web-client. I am pretty limited in installing software at work.

I recently found https://www.aliasvault.com/. It is still in early-ish development but the 1.0 release including a security audit is planned for end of this or beginning of next year. The main developer is also very active on https://www.privacyguides.org/ and listens to community feedback.

Cant wait for it to mature a bit. Right now my biggest gripe is UI/UX related.