Specifically with an eye for Bridgetown static sites and/or small Rails apps.
- Render - Static hosting, but also Node/Python/Go/Rust/Ruby/Elixir apps, Postgres, Redis, cron. Everything but cron has a $0 base tier (but Postgres is only free for 90d). TLS support, CDN for assets. Positioning as a better Heroku given the latter is more or less on life-support.
- Fly - Run anything in a Dockerfile, deploys to multiple geo locations for fast reads, manages a distributed Postgres cluster across those deploy locations. Loves Elixir/Phoenix (employs Chris McCord).
- Netlify - Static hosting, serverless functions, form submissions. Baseline pricing by “member” feels weird though.
- Vercel - Static hosting, serverless functions, also with the “per member” pricing.
- Neon does “serverless” Postgresql, free tier handles 3gb data and enough active CPU time to manage it. Has a “branch” concept to let you fork your prod database for a staging/QA environment with copy-on-write semantics so it’s a cheap operation to spin up, free tier supports 100 hours CPU time across up to 9 non-primary branches.