you need an account for it though, right? meaning they have access to your stuff. and because they use unique formatting such as `![[filename]]`, it may not be easily cross-compatible
No account needed. They don't have access to your stuff—it works on local files—but appear to be working on a cloud option. They claim to support Commonmark and Github Flavored Markdown. [[filename]] is just a shortcut for [filename](filename), but in any case "Export to standard Markdown links" is on their short-term roadmap.
