5 Best Open Source Fauna Alternatives
A curated collection of the 5 best open source and self-hosted alternatives to Fauna in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for Fauna in 2026? The top open-source alternative is Supabase — Open source Postgres development platform.
Other highly rated open-source Fauna alternatives include TiDB, Convex and Instant.
Open source Postgres development platform
Supabase is an open-source platform that provides developers with a full suite of tools to build scalable applications quickly. Built on top of PostgreSQL, it offers integrated features like authentication, real-time data synchronization, edge functions, and storage. - Postgres Database: Full PostgreSQL database with built-in authentication and Row Level Security (RLS). - Authentication: Secure user sign-ups and logins with RLS for data protection. - Edge Functions: Write and deploy custom code without managing servers. - Realtime: Enable multiplayer experiences with live data synchronization. - Storage: Store, organize, and serve large files like videos and images. - Vector Embeddings: Integrate ML models to store, index, and search vector embeddings. - Instant APIs: Ready-to-use REST APIs for seamless data access. - Dashboard: Manage your app directly from the dashboard with tools like Table Editor, SQL Editor, and RLS Policies. Supabase is open-source and can be self-hosted. It is built on PostgreSQL, making it highly portable and extensible. The platform is trusted by fast-growing companies worldwide and offers a free tier to get started.
Fully managed auto-scaling SQL database
TiDB Cloud is a fully managed, auto-scaling SQL database designed for modern applications, including AI workloads. Built on open-source TiDB, it offers seamless scalability, high availability, and compatibility with MySQL. - Auto-scaling: Dynamically adjusts resources to handle fluctuating workloads without manual intervention. - MySQL Compatibility: Fully compatible with MySQL, enabling easy migration and integration. - High Availability: Multi-region deployments ensure uptime and data durability. - AI-Optimized: Purpose-built for AI applications, including vector search and persistent context for agents. - Generous Free Tier: Start for free with scalable resources and pay-as-you-go pricing. - Global Reach: Deploy in multiple regions for low-latency access worldwide. - Security & Compliance: Enterprise-grade security with GDPR and SOC 2 compliance. TiDB Cloud is a fully managed service, but the open-source TiDB database can be self-hosted for complete control. Self-hosted deployments support Kubernetes, bare metal, and cloud environments. For AI workloads, TiDB provides native vector indexing and retrieval-augmented generation (RAG) pipelines.
Reactive backend platform for agents and apps
Convex is a reactive backend platform designed to keep pace with developers and their AI agents. It combines a realtime database, functions, workflows, sync, search, and file storage into a single TypeScript-based solution with zero glue code. - Realtime Database: Keep your app up to date with built-in realtime capabilities. - Authentication: Over 80+ OAuth integrations for seamless user management. - Components: Independent, modular TypeScript building blocks for your backend. - AI Coding: Generate high-quality Convex code with AI tools and plugins. - Open Source: Self-host and develop locally with full control. - Templates: Quick-start recipes for common use cases. - Search: Cross-document and community search for efficient development. - File Storage: Integrated file storage solutions. Convex is open source and can be self-hosted, allowing full control over your infrastructure. It supports TypeScript natively and integrates with popular frameworks and tools. The platform is designed for scalability and performance, making it suitable for both small projects and enterprise applications.
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.
Unified distributed database for transactions, analytics, and AI
OceanBase is a unified distributed database designed to handle transactional, analytical, and AI workloads with ultra-fast performance. It maintains world records in both TPC-C (OLTP) and TPC-H (analytics) benchmarks, demonstrating its exceptional scalability and efficiency. - Unified Database: Supports OLTP, real-time analytics, and AI workloads in a single system - World-Record Performance: Holds TPC-C and TPC-H benchmark records for speed and scalability - Global Deployment: Enables multi-cloud and global application deployment with active geo-redundancy - Elastic Scaling: Automatically scales to handle peak traffic demands without downtime - Mission-Critical Reliability: Powers critical systems for 400+ enterprises including Alipay - Open Source Community Edition: Free, open-source distributed database available - AI Lakebase: Specialized version for operational data, real-time analytics, and AI applications - Database Consolidation: Supports multi-tenant architectures for efficient resource utilization OceanBase offers multiple deployment options: - OceanBase Cloud: Fully managed cloud service for easy deployment and scaling - OceanBase Enterprise: Self-hosted version for on-premises or private cloud deployment - Community Edition: Open-source version available on GitHub for self-hosting - OceanBase seekdb: Open-source AI-native search database The database is compatible with standard SQL interfaces and provides connectors for various programming languages and frameworks. Comprehensive documentation and training resources are available for all deployment options.
About Fauna
The truly serverless database that combines the power of a relational database with the flexibility of JSON documents.