Grapesjs is awesome software thanks for making it! I've been looking for a chance to use grapesjs in some projects but haven't had the chance to yet but it looks fantastic -- it's been bookmarked for a long time :).
I think it might be a good idea to further limit your free tier to a time trial (a week?) maybe rather than # of projects, and maybe adding a cheaper tier -- the ability to make a website with only drag and drop.
Some that you might consider competitors:
- http://macaw.co/ (not really)
- https://landingi.com/pricing
Also, I'm not sure who your main audience is, but using ',' for a decimal point is not commonplace in the USA. I doubt any worthwhile customer would think it was $1,490 a month, but just saying.