USYD Wall is a student-run community for University of Sydney students in Sydney: course reviews and difficulty ratings, a student forum, campus events, clubs and societies and a marketplace. Anyone can read it without an account; posting, commenting and writing reviews need a verified university email (uni.sydney.edu.au / sydney.edu.au), so what you read comes from enrolled USYD students.
1283 USYD courses have student reviews here. Each course page gives an overall score, difficulty and would-recommend ratings, merged from reviews written on USYD Wall and public sources such as StudentVIP and Reddit.
Many posts are written in Chinese — the community started with Chinese-speaking students — and the app translates posts and comments into English.
USYD Wall is an independent student community and is not affiliated with University of Sydney.