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Security2 alternatives·~$3/mo to replace

2 Best Duo Security Alternatives for Small Teams (2026)

Duo Security averages $3/user/month. Below are 2 hand-picked alternatives (2 of them free or open-source) with verified pricing and honest pros and cons. Ranked by potential savings.

Quick pick

If you’re short on time, the best free pick is Authelia (Open source) — Open-source authentication and authorization server. TOTP, WebAuthn, push notifications, and SSO.

For a deeper read, scroll the full list below. Each entry covers price, what type of alternative it is, and the official website.

All 2 alternatives, ranked by savings

  1. #1

    Authelia

    Open sourceFree · saves 100% vs Duo Security

    Open-source authentication and authorization server. TOTP, WebAuthn, push notifications, and SSO.

    authelia.com ↗
  2. #2

    privacyIDEA

    Open sourceFree · saves 100% vs Duo Security

    Open-source MFA solution. TOTP, HOTP, SMS, email, push tokens. Self-hosted with LDAP integration.

    privacyidea.org ↗

How to actually pick one

Three-question filter:

  1. Can you self-host? If yes, the open-source picks usually win on cost and data ownership.
  2. Will the alternative cover ≥80% of your current use case? Don’t switch for a 50% feature match — the hidden cost of workflow re-learning outweighs the savings.
  3. What does the renewal math say? Calculate 12 months of cost on the alternative vs. Duo Security, then subtract switching cost (estimated at ~1 work week).

See also