OpenOTP Authentication Server review
A broad self-hosted MFA server for organizations that need PKI and federation.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
OpenOTP Authentication Server is a multi-factor authentication platform from RCDevs Security SA for organizations securing domain users, applications, VPNs, Wi-Fi, desktops, servers and remote access. It supports on-premise and cloud deployments across Linux and self-hosted environments, with mobile apps for iOS and Android. Its factor coverage includes software and hardware tokens, mobile push, FIDO2, passkeys, smart cards, PKI certificates, SMS, email, secure email, magic links and QR codes. Passwordless Windows login, adaptive access, device trust and contextual policies extend its use beyond basic second-factor prompts.
Pricing is structured around a renewable Freeware License and an Enterprise Subscription. The Freeware License supports up to 25 users, includes all features except high availability and encryption of configuration data, and remains valid for 365 days with renewal. The Enterprise Subscription uses annual per-user licensing, with user packs and pricing handled through sales; software maintenance is included. A 30-day trial is also available. This makes the freeware option relevant for small deployments, while larger organizations should plan around a quote-based subscription and the capabilities required for production use.
Its strongest fit is an environment that needs several integration paths rather than a single login method. Active Directory and LDAP support combine with RADIUS for VPN, Wi-Fi and network services, LDAP proxying for legacy applications, and SAML2, OpenID Connect, OAuth and ADFS for federated access. Integrations also cover Citrix, VMware, Windows RDP/RDS, Linux PAM, Nextcloud and ownCloud. Organizations seeking self-hosted MFA with PKI, certificate authentication, federation and passwordless Windows access should consider OpenOTP. Those prioritizing open-source software or a larger freeware allowance should choose an alternative.
OpenOTP Authentication Server pros and cons
- Where it wins
- Supports OTP, push, FIDO2, passkeys, smart cards and PKI
- Bridges RADIUS and LDAP for VPN, Wi-Fi and legacy applications
- Offers SAML2, OpenID Connect, OAuth and SOAP/XML or JSON APIs
- Where it doesn't
- Freeware License supports up to 25 users
- High availability is excluded from the Freeware License
- The product is not open source
OpenOTP Authentication Server fact sheet, pricing and score →
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