Best Databases & Backend APIs for AI Agents in 2026

NoSQL cloud database with real-time sync across clients.

Best for: Real-time sync across clients with zero backend code

Open-source Firebase alternative with PostgreSQL, auth, and storage.

Best for: Best open-source Firebase alternative - Postgres under the hood

Access MongoDB data via HTTPS endpoints without drivers.

Best for: Access MongoDB over HTTP without a driver - great for serverless

Serverless Redis, Kafka, and QStash for edge applications.

Best for: Serverless Redis and Kafka with per-request pricing

Serverless PostgreSQL with branching, autoscaling, and instant provisioning.

Best for: Serverless Postgres that scales to zero - pay only when active

Managed vector database for AI similarity search and RAG.

Best for: Most popular managed vector database for AI/RAG applications

Open-source vector database for semantic search and AI apps.

Best for: Open-source vector database you can self-host

Reactive backend with real-time queries and serverless functions.

Best for: Real-time backend with automatic reactivity - no polling needed

Serverless MySQL platform with branching and non-blocking schema changes.

Best for: Serverless MySQL with branching - database version control

Distributed document-relational database with native GraphQL.

Best for: Globally distributed database with strong consistency