I like glasswire a lot, the ability to have virustotal analyze new processes is awesome. Someone in one of the threads mentioned going through steam for the lifetime license (what I did) and it works well. It does get a little thirsty if you keep the monitoring window open but overall it is very helpful. I forgot i had a backup job running and that helped me remember. I was hoping the monitoring would be cloud based but i missread...you have to run a local client to connect to the remote client which probably preferable for a lot of people. Regarding Heimdal, they are a fast growing company, they have an LTD on stack social for their foresight tool for 3 devices. It uses both ai and signatures and uses minimal resources. They have some informative youtube videos also.