It seems the question is ambiguous. Everyone is responding with the marketing websites of SaaS compnaies, but I interpreted it as asking for well-designed inter

It seems the question is ambiguous. Everyone is responding with the marketing websites of SaaS compnaies, but I interpreted it as asking for well-designed internal interfaces of SaaS websites. Would love to see examples of that which people think are particularly great. Personally I've always found Gusto and Basecamp to have very good interfaces. Stripe's internal interface (which others have mentioned for their public site) gets the job done but I would hardly call it great.