looks like a slopfork of the fairly new https://shaders.com - frustrating for them!
I'm the Founder at https://shaders.com . Not frustrating at all, and Basement is an excellent team. Shader Lab looks like a solid tool for exploration and and creating effects, nothing slop about it (although I love the word "slopfork", that's new). Our platform goes above and beyond that with a large collection of Pro presets and a unique capability in our component-based approach with reactive props, and of course…
Went to try it and then gave up after it asked me to sign up/log in