The best alternatives to StaticWeb Studio are Gatsby, Carrd, and Softr. If these 3 options don't work for you, we've listed a few more alternatives below.
A free platform for building simple, fully responsive one-page sites for pretty much anything. With over 4000 upvotes, Carrd is one the most popular products of all time on Product Hunt.
Softr turns your spreadsheets (Airtable, Google Sheets) and databases into customer portals, internal tools, and any other custom app. Pick a template or start from scratch.
Sitesauce converts your dynamic websites into static sites, so you can keep your existing workflow while enjoying all the benefits static sites provide.