See also:

• Free backend hosting
• https://free-for.dev/#/?id=dbaas

Service	Type	Storage	Limitations
Amazon DynamoDB	⚠️ Proprietary NoSQL	25 GB	⚠️ Payment method required
Amazon RDS	⚠️ Proprietary RDBMS		⚠️ Only free for 1 year
Azure SQL Database	MS SQL Server		⚠️ Only free for 1 year
👉 Clever Cloud	PostgreSQL, MySQL, MongoDB, Redis	256 MB (PostgreSQL)	Max 5 connections (PostgreSQL)
ElephantSQL (⚠️reaching end of life)	PostgreSQL	20 MB	5 concurrent connections This service will not be available after 27-Jan-2025. They have already stopped taking new users w.e.f. 01-May-2024.
Fly.io	PostgreSQL	3 GB	⚠️ Credit card required, limited outbound traffic, no way to avoid accidental overage fees
Google Cloud Firestore	⚠️ Proprietary NoSQL	1 GB	⚠️ After the first year there's no way to avoid accidental overage fees
Heroku Postgres (discontinued) 😭	PostgreSQL	10K max rows
IBM Cloud Cloudant	⚠️ Proprietary NoSQL	1 GB	Deleted after 30 days of no activity
IBM Cloud Db2	Db2	200 MB	⚠️ "users are asked to re-extend their free account every 90 days by email. If you do not re-extend, your free account is cleaned out a further 90 days later"
MongoDB Atlas	MongoDB	512 MB
OpenShift Developer Sandbox	MariaDB, MongoDB, MySQL, PostgreSQL	15 GB	⚠️ Expires after 30 days (can resubscribe for free but not extend subscription), pods are automatically deleted after 12 consecutive hours of runtime
Oracle Cloud	Oracle Database	20 GB each per two databases	⚠️ Payment method required
Redis Enterprise	Redis	30 MB
Scalingo	PostgreSQL	128 MB	Max 10 connections ⚠️ Payment method required after 30 day trial
👉 Supabase	PostgreSQL	500 MB	Paused after 1 week inactivity 2 GB transfer limit