Design tools for solo founders?

Hi all,

Can indie hackers suggest any low-code design tools please? I would like to build a web site mock-up and then export the code into plain html, css and js so that I can scale it up and add backend in the future. I've been using Bootstrap Studio but I find it buggy and the default css is annoying. Webflow is better but is more for those who do it regularly and professionally hence the export option is not available on a freemium. Glitch is not low-code in my view. Saul is good in general but too buggy and with little community. Any other suggestions for those who have a basic understanding of html, css & js but who can't produce a mock-up without a GUI?