Does Guru support spellcheck?
Yes! Your default browser spell-check will work in Guru.
Does Guru support Grammarly?
At this time, the Grammarly extension is not fully supported in Guru.
When you are in the web app, Grammarly will be disabled and you will see your operating system's spellcheck indicate errors instead. As a workaround, you can copy/paste your Guru Card into the Grammarly web-app to correct spelling and grammar errors before pasting the copy back into a Guru Card.