Best Open Source Alternatives to Duo Security

Compare the best free and open-source alternatives to Duo Security — 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

Duo Security

Proprietary SaaS

PricingFreemium

Platformsios, android, web

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Duo Security alternatives compared

Open-source alternatives to Duo Security, compared by stars, license and platform
Tool		License	Platforms	Self-hosted
Ente Auth	28,080	AGPL-3.0	iosandroidWeb	No	Aug 2026	Visit
Aegis Authenticator	12,832	GPL-3.0	android	No	Jul 2026	Visit
PrivacyIdea	1,748	AGPL-3.0	LinuxDocker	Yes	Jul 2026	Visit