Warning: Use at your own risk. There are no warranties or guarentees with this site. It uses ADB.JS and some of my own code, and everything is done in browser. The ADB protocol is a debbuging protocol and as such it could be possible to get access to all of your data. If you don't trust this tool, your machine, or extensions in this browser, don't use this site.
Quick LogCat is a simple tool that connects to your Android phone using the ADB protocol over the WebUSB API and it runs the logcat command.
Why? I needed a quick way to get a Logcat output from my KaiOS device on Chrome OS without installing ADB.