Neon
Serverless Postgres with branching and autoscaling
Free tier, Pro from $19/mo
PlanetScale
Serverless MySQL platform with branching
From $39/mo (free tier discontinued)
Supabase
Open source Firebase alternative with Postgres
Free tier, Pro from $25/mo
Upstash
Serverless Redis, Kafka, and QStash for modern apps
Free tier, usage-based from $0.20/100K commands