PostgreSQL is the most powerful open-source object-relational database system, maintained by a global developer community, renowned for its extensibility, standard compliance, and reliability.
Render, founded in 2019 in San Francisco (YC S19), is a unified developer cloud PaaS offering one-click deployment of static sites, web services, PostgreSQL, Redis and cron jobs, with a free tier of 750 instance hours per month and widely seen as a modern Heroku alternative.
Railway is a developer deployment platform founded in 2020 in Phoenix, Arizona (YC S20, $50M+ raised). It auto-builds and deploys apps from Git repos, hosts Postgres/Redis, bills by usage with a $5 monthly free allowance, and is a popular modern Heroku alternative.
Supabase is an open-source Firebase alternative headquartered in San Francisco, United States, providing PostgreSQL database, authentication, realtime subscriptions, and storage as a backend platform for building apps.