Open-source alternatives guide · Updated 2026
Compare the best free and open-source alternatives to Fauna — 6 verified projects with explicit catalog relationships. Inspect licenses, GitHub activity, self-hosting signals, and migration fit before you switch.
Only explicit alternative relationships are shown—never inferred competitor claims.
This guide compares 6 verified open-source alternatives to Fauna, including [Supabase](/projects/supabase), TiDB, Convex, and FerretDB.
Projects appear across AI & Machine Learning and Data & Analytics. 2 options include a self-hosting signal — see the self-hosted catalog. Ranking follows public GitHub stars and recorded momentum—not vendor marketing. Compare projects side by side, then confirm license fit, migration effort, and operational ownership before adopting any option.
Strongest repository-activity signal: Supabase · Jump to ranking · 107.2K stars
Proprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, repository activity, and self-hosting options befo
Compare capabilities, licensing, and ownership model. Stars help with discovery; they are not a security or product-fit guarantee.
The Postgres development platform. Supabase gives you a dedicated Postgres database to build your web, mobile, and AI applications.
The Postgres development platform. Supabase gives you a dedicated Postgres database to build your web, mobile, and AI applications. Review the official repository, license, release
Open-source alternative to Fauna
TiDB is built for agentic workloads that grow unpredictably, with ACID guarantees and native support for transactions, analytics, and vector search. No data silos. No noisy neighbors. No infrastructure ceiling.
TiDB is built for agentic workloads that grow unpredictably, with ACID guarantees and native support for transactions, analytics, and vector search. No data silos. No noisy neighbo
Open-source alternative to Fauna
The open-source reactive database for app developers
The open-source reactive database for app developers Review the official repository, license, release activity, and deployment documentation before production adoption.
Open-source alternative to Fauna
A truly Open Source MongoDB alternative
A truly Open Source MongoDB alternative Review the official repository, license, release activity, and deployment documentation before production adoption.
Open-source alternative to Fauna
Instant is the best backend for AI-coded apps. You get auth, permissions, storage, presence, and streams — everything you need to ship apps your users will love.
Instant is the best backend for AI-coded apps. You get auth, permissions, storage, presence, and streams — everything you need to ship apps your users will love. Review the offici
Open-source alternative to Fauna
The Fastest Distributed Database for Transactional, Analytical, and AI Workloads.
The Fastest Distributed Database for Transactional, Analytical, and AI Workloads. Review the official repository, license, release activity, and deployment documentation before pr
Map must-have capabilitiesList the workflows in Fauna you cannot drop during migration.
Verify the licenseConfirm it fits your use, distribution, and compliance model. Browse license briefs.
Run a proof of conceptTest real data, integrations, clients, and failure modes. Use Compare for side-by-side checks.
Plan ownershipAssess upgrades, backups, support, and an exit path. Read when self-hosting is worth it.
OpenSourceChoice currently lists 6 projects with an explicit alternative relationship to Fauna. Catalog highlights include [Supabase](/projects/supabase), TiDB, and Convex. Rankings follow public GitHub stars and recorded momentum—not paid placement. Match capabilities and license fit to your workflow before adopting any option.
Most catalogued alternatives publish source under OSI or source-available licenses and are free to inspect. Hosting, commercial support, or cloud model APIs may still cost money. Always read the project license for your use case.
2 options in this list carry a self-hosting signal. Confirm the official install guide, backups, upgrades, and hardening steps before production.
Map must-have Fauna workflows, verify license and compliance fit, run a proof of concept with real data and integrations, then plan ownership for upgrades, backups, support, and an exit path.
Narrow the same alternatives by search, license, tags, or self-hosting signals when you need a tighter shortlist.
United StatesApache-2.0The Postgres development platform. Supabase gives you a dedicated Postgres database to build your web, mobile, and AI applications.
AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.#
TypeScriptProjects tagged with this topic in the verified catalog.
Github ActionsProjects tagged with this topic in the verified catalog.
JavaScriptProjects tagged with this topic in the verified catalog.AI-nativeThis project includes AI-native capability signals in the catalog metadata.
FaunaProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…TiDB is built for agentic workloads that grow unpredictably, with ACID guarantees and native support for transactions, analytics, and vector search. No data silos. No noisy neighbors. No infrastructure ceiling.
AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.#
GoProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.AI-nativeThis project includes AI-native capability signals in the catalog metadata.FaunaProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…The open-source reactive database for app developers
Data & AnalyticsOpen-source projects grouped in this category for discovery and comparison.#TypeScriptProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.FaunaProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…A truly Open Source MongoDB alternative
Data & AnalyticsOpen-source projects grouped in this category for discovery and comparison.#GoProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.
Self-hostedThis project carries a self-hosting or local-deployment signal. Verify the official install guide before production use.FaunaProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…Instant is the best backend for AI-coded apps. You get auth, permissions, storage, presence, and streams — everything you need to ship apps your users will love.
AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.#TypeScriptProjects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.JavaScriptProjects tagged with this topic in the verified catalog.AI-nativeThis project includes AI-native capability signals in the catalog metadata.FaunaProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…The Fastest Distributed Database for Transactional, Analytical, and AI Workloads.
AI & Machine LearningOpen-source projects grouped in this category for discovery and comparison.#
C++Projects tagged with this topic in the verified catalog.Github ActionsProjects tagged with this topic in the verified catalog.
BashProjects tagged with this topic in the verified catalog.Self-hostedThis project carries a self-hosting or local-deployment signal. Verify the official install guide before production use.AI-nativeThis project includes AI-native capability signals in the catalog metadata.FaunaProprietary product with documented open-source alternatives cataloged on OpenSourceChoice. Compare licenses, reposit…
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