Best Open-Source Alternatives to Firebase Auth (2026) | open-source.store

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Best Open Source Alternatives to Firebase Auth

Compare the best free and open-source alternatives to Firebase Auth — self-hosted and desktop replacements you fully control, ranked by GitHub stars, license and platform support.

Curated by open-source.store · Updated August 2026 · 3 alternatives

Firebase Auth

Proprietary SaaS

PricingFreemium

Platformsweb, ios, android

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Firebase Auth alternatives compared

Open-source alternatives to Firebase Auth, compared by stars, license and platform
Tool		License	Platforms	Self-hosted
SuperTokens	15,240	Apache-2.0	LinuxDocker	Yes	Jul 2026	Visit
Zitadel	14,614	Apache-2.0	LinuxDocker	Yes	Jul 2026	Visit
Ory Kratos	13,804	Apache-2.0	LinuxDocker	Yes	Jul 2026	Visit