Best Free Serverless Databases in 2026

Popular open-source relational database

4.5/5 across SourceForge and G2 · 1,688 ratings, Sep 2026

MySQL is the relational database that powered the web. Open source, reliable, and understood-the database behind countless applications. The ecosystem is vast. The knowledge is widespread. The reliability is proven. Web applications often use MySQL because it works and everyone knows it.

Managed in-memory database for real-time data across clouds

4.5/5 on G2 · 136 ratings, Sep 2026

Redis Cloud is a fully managed in-memory database service offering real-time data capabilities across AWS, Azure, and GCP with enterprise-grade features including active-active replication and auto-tiering.

Document database with sync and offline support

3.9/5 on G2 · 64 ratings, Sep 2026

CouchDB stores JSON documents with built-in synchronization and conflict resolution. Deploy it anywhere, work offline, and trust that data will sync when connectivity returns. The replication protocol is elegant and proven. REST API makes access straightforward. The focus on reliability over speed serves specific use cases well. Applications with offline requirements or multi-master replication needs choose CouchDB for a database designed around sync.

Official MCP server to manage serverless Postgres with AI

Neon is serverless Postgres with database branching, where a branch is a copy on write clone of the data that spins up in seconds and can be discarded just as fast. Its MCP server exposes both that control plane and the SQL surface, which makes it one of the few database integrations where an agent can experiment without putting the main database at risk. An agent connected to it can list and create projects, create, list and delete branches, fetch connection strings, describe database and table schemas, and execute SQL against a chosen branch. It also supports a migration pattern that fits agents specifically: the change is applied to a temporary branch first, verified there, then committed to the main branch, so a migration that breaks something never lands on production data in the first place. This is built for developers working on a Neon project with an assistant in the editor. The assistant reads the real schema instead of guessing from model files, tries a query against a branch, and proposes a migration for approval before anything is committed. The usual caution for SQL access applies: the connection carries whatever permissions its role has, so use a limited role and keep destructive statements behind human review.

Set up serverless PostgreSQL instantly with pooling and automated backups

Prisma Postgres is serverless PostgreSQL for TypeScript and AI apps: instant setup, built-in pooling, and a free plan with no credit card (200k operations/mo, 2 GB). Pair it with Prisma ORM or any Postgres client, and optionally host the app next to the database with Prisma Compute. Paid plans are available; Business adds HIPAA with a signed BAA. Standard Postgres underneath, so you can leave with a normal dump.