Looks like it from the Documentation. The User and Developer Guide references Atom quite a bit (includes the original Atom docs too)
An aside, but I wish more webpages for applications put screenshots on the front page. Probably would had made it easier to notice if the application was based on Electron or not
An aside, but I wish more webpages for applications put screenshots on the front page. Probably would had made it easier to notice if the application was based on Electron or not