Cass

Cass is a clone of the infamous invisible AI assistant Cluely. Only works on macOS though.

I built Cass to learn a lot about macOS internals (how screen sharing and audio mixing works) and also just the tech behind Interview Coder/Cluely. It's suprisingly very simple.

I don't work on the project anymore for obvious PR reasons, but you can check out the code on Github.

I don't recommend using this tool for unethical purposes, such as cheating on interviews or other use cases. There are also updates and workarounds that limit the effectiveness of the invisibility features. For example, sometime before July 4, 2025, Zoom's screen recording method using the ScreenCaptureKit API changed, which makes Cass no longer invisible out of the box. You now have to manually go into the Zoom settings and turn on the "Advanced capture with window filtering" setting.