Inertia does not currently support server-side rendering. If that's a priority for your application, Inertia may not be the right choice for you. That said, we believe server-side rendering to be technically possible with Inertia, and are likely to revisit this in the future.
Depictr - A package developed by Linus Juhlin, which renders static pages for search engine crawlers.
Some Inertia users are successfully using services like Prerender.io, Prerender.cloud and Rendertron to generate and cache HTML versions of their Inertia websites, and then serve that content to bots for SEO purposes.