What web tech stack are folks choosing for seed stage startups today?

Laravel+Livewire

It is as close to nocode as you can get. It has sane defaults, Hosting is cheaper than coffee.

The default setup is faster than Django and rails, and with swoole it can handle way more requests than node. But yeah none of this should matter. Go with something you and your team is comfortable with.

Also from my experience your location might be important too, Django/Ruby if you are in the US, PHP or Node or C like languages for the rest of the world. But with remote work, that might not matter as well.

Rails

Or the obligatory "the stack you already know".

Worrying about your tech stack is one of those procrastination traps like fiddling with your development environment too much rather than writing code.

Elixir seems cool. RoR and React Native used to be the bread and butter given the bustling community. I imagine the community is still there and I'd still recommend anyone wondering about this question to just use RoR+RN. But I think Elixir has been a really interesting piece of tech that now has native mobile app dev capabilities[0] though IDK how it compares in ease-of-use and community support:)

[0] https://native.live/ -- HN Discussion @ https://news.ycombinator.com/item?id=32694668

JS, Node.js, MySQL, AWS