8 Best Open Source MongoDB Alternatives
A curated collection of the 8 best open source and self-hosted alternatives to MongoDB in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for MongoDB in 2026? The top open-source alternative is TiDB — Distributed SQL database combining OLTP and OLAP capabilities, offering horizontal scalability, high availability, and real-time analytics..
Other highly rated open-source MongoDB alternatives include Turso, Convex and Instant.
Distributed SQL database combining OLTP and OLAP capabilities, offering horizontal scalability, high availability, and real-time analytics.
Distributed SQL database combining OLTP and OLAP capabilities, offering horizontal scalability, high availability, and real-time analytics.
Turso provides a simple developer experience with SQLite compatibility, allowing you to build and scale multi-tenant applications with unlimited databases.
Turso provides a simple developer experience with SQLite compatibility, allowing you to build and scale multi-tenant applications with unlimited databases.
Open-source reactive database that keeps your web and mobile apps in sync. Write everything in TypeScript with built-in auth, cron jobs, and AI integration.
Open-source reactive database that keeps your web and mobile apps in sync. Write everything in TypeScript with built-in auth, cron jobs, and AI integration.
Instant is a database solution for building real-time and offline-enabled applications, simplifying the development of collaborative products.
Instant is a database solution for building real-time and offline-enabled applications, simplifying the development of collaborative products.
Scalable, high-availability database system supporting OLTP, OLAP, and hybrid transactional/analytical processing workloads.
Scalable, high-availability database system supporting OLTP, OLAP, and hybrid transactional/analytical processing workloads.
Continual Learning Infrastructure for AI Agents
Activeloop provides the infrastructure for continual learning, enabling AI agents to improve with each execution. Their GPU database, Deeplake, unifies vector and tensor data for efficient agent operations. - Deeplake Database: GPU-native database combining vector and tensor storage for AI agents - Hivemind Memory: Agent traces become shared organizational skills for cross-team reuse - Refinery Software Factory: Continuous learning pipeline that turns feedback into production improvements - GPU Streaming: Enables real-time fine-tuning and optimization - Serverless Postgres Interface: Familiar SQL interface for vector and tensor data - Trajectory Capture: Records agent execution paths for analysis and improvement - Skill Distribution: Shares learned skills across teams and projects - Benchmarking & Verification: Ensures only validated improvements move forward Activeloop offers both cloud-hosted and self-hosted solutions. The open-source Deeplake database can be deployed on-premises or in cloud environments. The company provides enterprise-grade support and professional services for production deployments.
Memgraph is a scalable, in-memory graph database solution offering high-performance computing and Neo4j compatibility.
Memgraph is a scalable, in-memory graph database solution offering high-performance computing and Neo4j compatibility.
SlateDB is an embedded storage engine that leverages object storage for durability, scalability, and simplified replication without the need for disk management.
SlateDB is an embedded storage engine that leverages object storage for durability, scalability, and simplified replication without the need for disk management.
About MongoDB
A NoSQL database program that uses JSON-like documents with optional schemas.