Marvel
8.2#1 in user flow softwareFrom $12 a monthFree planAndroidiOSWebAPI
VisitMarvel suits individuals or teams that need to create and share prototypes, collect design feedback, and hand design assets and code to developers. Its listed audience includes startups, larger companies, and schools.
Synclet suits product teams and individuals who want prototypes from written descriptions and iterative chat refinement. It is also relevant to people preparing Markdown specifications for AI coding tools.