# 5 Best Open Source Alternatives for Fauna

Canonical: https://caniforkit.com/fauna
Last updated: 2026-11-07

Looking for the best open source alternative for Fauna? Compare 5 verified free and open source alternatives to Fauna (Supabase, TiDB, Convex) with license details, self-hosting requirements, and practical trade-offs.

## Fauna Overview & Subscription Cost
- **Product**: Fauna
- **Category**: [dev tools](https://caniforkit.com/category/dev-tools)
- **Paid Subscription Price**: $25/month per seat
- **1-Seat Annualized Cost**: $300/year
- **5-Person Team Annualized Cost**: $1,500/year
- **10-Person Team Annualized Cost**: $3,000/year
- **Can I Vibe-Code / Rebuild It Myself?**: NO (use a free alternative, save the tokens)
- **Rebuild Verdict**: Instead of paying recurring SaaS fees for Fauna or rebuilding it from scratch, deploy one of the 5 battle-tested open-source alternatives like Supabase.

## Verified Free & Open Source Alternatives

| Alternative | Type | License | Runs On | GitHub Stars | Head-to-Head |
| --- | --- | --- | --- | --- | --- |
| [Supabase](https://caniforkit.com/fork/supabase) | Open Source | Apache-2.0 | Self-host | ★ 114.6k | [Compare vs Fauna](https://caniforkit.com/vs/fauna-vs-supabase) |
| [TiDB](https://caniforkit.com/fork/tidb) | Open Source | Open Source | Local | ★ 40.7k | [Compare vs Fauna](https://caniforkit.com/vs/fauna-vs-tidb) |
| [Convex](https://caniforkit.com/fork/convex) | Open Source | Open Source | Self-host | ★ 12.8k | [Compare vs Fauna](https://caniforkit.com/vs/fauna-vs-convex) |
| [Instant](https://caniforkit.com/fork/instant) | Open Source | Open Source | Local | ★ 10.6k | [Compare vs Fauna](https://caniforkit.com/vs/fauna-vs-instant) |
| [OceanBase](https://caniforkit.com/fork/oceanbase) | Open Source | Open Source | Local | ★ 10.4k | [Compare vs Fauna](https://caniforkit.com/vs/fauna-vs-oceanbase) |

## In-Depth Alternative Profiles

### Supabase
- **Fork Page**: [Supabase Profile](https://caniforkit.com/fork/supabase)
- **Head-to-Head Comparison**: [Fauna vs Supabase](https://caniforkit.com/vs/fauna-vs-supabase)
- **Official Website**: https://supabase.com/
- **Source Code Repository**: https://github.com/supabase/supabase
- **License**: Apache-2.0
- **Runs On**: Self-host
- **GitHub Stars**: 114.6k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, cli, self-host, real ops
- **Summary**: Provides a full backend stack built on Postgres: authentication, auto-generated APIs, edge functions, realtime subscriptions, file storage, and vector search.
- **The Catch vs Fauna**: Supabase replaces Convex's document/function runtime with PostgreSQL, SQL migrations, row-level security, and separate services, so the application architecture must be rewritten rather than simply moved.
- **Installation**: Hosted Supabase project, or the official Docker Compose stack; `supabase start` runs the local stack
- **Setup**: Self-hosting is not 'just Postgres': the Compose stack needs many secrets and services, plus SMTP, object storage, TLS, backups, observability, and coordinated upgrades.
- **Data Storage**: Relational data, auth records, and platform metadata live in PostgreSQL; Realtime consumes the Postgres replication stream; object data lives in the configured storage backend with metadata in Postgres; edge-function and migration source stays in project files. Supabase Cloud stores and operates the managed copy.

### TiDB
- **Fork Page**: [TiDB Profile](https://caniforkit.com/fork/tidb)
- **Head-to-Head Comparison**: [Fauna vs TiDB](https://caniforkit.com/vs/fauna-vs-tidb)
- **Official Website**: https://tidb.cloud/
- **Source Code Repository**: https://github.com/pingcap/tidb
- **License**: Open Source
- **Runs On**: Local
- **GitHub Stars**: 40.7k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: desktop, cross-platform, one-click install
- **Summary**: Distributed SQL database combining OLTP and OLAP capabilities, offering horizontal scalability, high availability, and real-time analytics.
- **The Catch vs Fauna**: Community-driven open source project without dedicated enterprise SLAs.
- **Installation**: Clone https://github.com/pingcap/tidb or deploy with Docker Compose
- **Setup**: Download the native package or installer for your operating system.
- **Data Storage**: All application data lives locally on your own machine.

### Convex
- **Fork Page**: [Convex Profile](https://caniforkit.com/fork/convex)
- **Head-to-Head Comparison**: [Fauna vs Convex](https://caniforkit.com/vs/fauna-vs-convex)
- **Official Website**: https://convex.dev
- **Source Code Repository**: https://github.com/get-convex/convex-backend
- **License**: Open Source
- **Runs On**: Self-host
- **GitHub Stars**: 12.8k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: web, self-hosted, docker to self-host
- **Summary**: 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.
- **The Catch vs Fauna**: Requires self-hosting setup, updates, and server maintenance compared to managed Fauna.
- **Installation**: Clone https://github.com/get-convex/convex-backend or deploy with Docker Compose
- **Setup**: Deploy via Docker or binary release from GitHub and configure environment variables.
- **Data Storage**: All application data and configuration live on your own server or local database.

### Instant
- **Fork Page**: [Instant Profile](https://caniforkit.com/fork/instant)
- **Head-to-Head Comparison**: [Fauna vs Instant](https://caniforkit.com/vs/fauna-vs-instant)
- **Official Website**: https://www.instantdb.com/
- **Source Code Repository**: https://github.com/instantdb/instant
- **License**: Open Source
- **Runs On**: Local
- **GitHub Stars**: 10.6k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: desktop, cross-platform, one-click install
- **Summary**: Instant is a database solution for building real-time and offline-enabled applications, simplifying the development of collaborative products.
- **The Catch vs Fauna**: Community-driven open source project without dedicated enterprise SLAs.
- **Installation**: Clone https://github.com/instantdb/instant or deploy with Docker Compose
- **Setup**: Download the native package or installer for your operating system.
- **Data Storage**: All application data lives locally on your own machine.

### OceanBase
- **Fork Page**: [OceanBase Profile](https://caniforkit.com/fork/oceanbase)
- **Head-to-Head Comparison**: [Fauna vs OceanBase](https://caniforkit.com/vs/fauna-vs-oceanbase)
- **Official Website**: https://en.oceanbase.com/
- **Source Code Repository**: https://github.com/oceanbase/oceanbase
- **License**: Open Source
- **Runs On**: Local
- **GitHub Stars**: 10.4k
- **Maintenance Activity**: nov 2026
- **Supported Platforms**: desktop, cross-platform, one-click install
- **Summary**: Scalable, high-availability database system supporting OLTP, OLAP, and hybrid transactional/analytical processing workloads.
- **The Catch vs Fauna**: Community-driven open source project without dedicated enterprise SLAs.
- **Installation**: Clone https://github.com/oceanbase/oceanbase or deploy with Docker Compose
- **Setup**: Download the native package or installer for your operating system.
- **Data Storage**: All application data lives locally on your own machine.

## Frequently Asked Questions

### What is the best free alternative to Fauna?
The top free alternative to Fauna is Supabase (open source, Apache-2.0). Provides a full backend stack built on Postgres: authentication, auto-generated APIs, edge functions, realtime subscriptions, file storage, and vector search. Other popular Fauna replacements include TiDB, Convex, Instant.

### How much does switching from Fauna to a free alternative save?
Fauna starts at $25/month per seat ($300/year). Switching a 5-person team to a free alternative like Supabase saves $1,500 per year in software subscription fees.

### What is the catch when switching away from Fauna?
While Supabase replaces core Fauna features without subscription fees, the real-world trade-off is: Supabase replaces Convex's document/function runtime with PostgreSQL, SQL migrations, row-level security, and separate services, so the application architecture must be rewritten rather than simply moved.

## Related

- [dev tools Software Category Hub](https://caniforkit.com/category/dev-tools)
- [All Paid SaaS Alternatives Index](https://caniforkit.com/alternatives)
- [Self-Hosted Software Directory](https://caniforkit.com/self-hosted)
- [Homepage](https://caniforkit.com)