Downloaded win version for a 32bit xp system and noticed two bugs,

1. along with the app another window started which was like the menu with a menu item "File" represented by a horizontal line at the very top of my screen, i just right clicked from task bar and closed it, main app still worked.

2. tried to open saved html file with browser (assigned to chrome) but the url was wrong, it was missing the drive letter so nothing showed.

3. after closing page and then choosing another template the app vanishes.

At first glance it is ok, maybe better suited for users without much experience with browser tools and code. However it provides viewing in different screen sizes, code snippets and drag and drop which are helpful.