I've been a VERY happy customer (no affiliation whatsoever) of Presentify for many years now, which was also a "Show HN" post (yeesh) 5 years ago
https://news.ycombinator.com/item?id=22938604
I am very excited to try Draw Over It—thank you for sharing. I speak at several conferences a year, and also do online workshops and training, and Presentify has been a godsend.
However, the one limitation is if you toggle it, you lose your annotations. And you can't do anything with the underlying app—can't scroll or click buttons. Looking forward to trying this out.
Thank you for your kind words! Indeed, I wanted the sketch to remain on-screen after disabling it too - in Draw Over It you can toggle whether you want it to remain on-screen or not :)