OpenOTP Authentication Server
OpenOTP Authentication Server is a multi-factor authentication server for securing network access with OTP and FIDO2.
What OpenOTP Authentication Server is
OpenOTP Authentication Server is a multi-factor authentication server for securing network access with OTP and FIDO2. It supports on-premise installation or cloud/SaaS deployment across Android, iOS, Linux, macOS, Windows, web, and API environments. Authentication methods include mobile push, FIDO2 and passkeys, YubiKey, OATH tokens, SMS, email, printed OTP lists, and PKI certificates. OpenOTP works with local Active Directory and LDAP directories and lists integrations with Entra ID, DUO, Okta, Google, Ping Identity, and One Identity. Policies can apply by application, user, group, risk, network, geolocation, or context, with step-up and step-down controls. Listed protections include phishing, denial-of-service, replay attacks, leaked passwords, geo-fencing, and integrated PKI. Federation and integration options include SAML, OpenID Connect, OAuth2, Kerberos, ADFS, a management API, SIEM, and a RADIUS Bridge for VPN and Wi-Fi or NAC authentication. Free options include on-premise use under 25 users and several trials. SMS requires credits or an external provider, while LDAP Bridge OTP is marked unsupported in listed editions.
Good
- Supports passkeys, push, tokens, SMS, and email
- Offers on-premise and cloud deployment
- Includes risk and geolocation policies
- Integrates with directories and federation protocols
- Free on-premise option under 25 users
Watch out
- SMS requires credits or an external provider
- LDAP Bridge OTP is marked unsupported
- SLA and support services are optional
- Some editions have user limits
Who it suits
It suits SMEs and large corporations in IT, finance, healthcare, and government. Organizations can choose on-premise or cloud deployment and connect existing directories, VPNs, and federation systems.
Verdict
OpenOTP offers broad authentication methods, policy controls, and deployment choices for enterprise access. Verify edition limits, support terms, and SMS requirements before implementation.
Plans and prices
From OpenOTP Authentication Server's own pricing page, checked 20 Sep 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Freeware Edition | — | 25 users · 1 server |
| Enterprise Edition | — | 250 users |
| Cloud Edition | — | 250 users |
| On-Premise Freeware | Free | under 25 users · all features · one server · no HA · 365 days, renewable |
| On-Premise Trial | Free | all features · 2 active/active servers (HA) · 30 days · up to 10 users |
| SaaS Trial | Free | 30 days · up to 250 OpenOTP users · 50 SpanKey hosts |
| OpenOTP On-Premise Edition | Priced on request | Request a quote |
The facts
Each one read from OpenOTP Authentication Server's own pages, with the date it was checked.
What it does
- Access policies
- The feature list includes per-application, per-user and group, risk-based, network and geolocation policies, plus contextual authentication and step-up/step-down policies.checked 30 Sep 2026
- Authentication methods
- Listed methods include mobile push, FIDO2/passkeys, YubiKey, OATH tokens, SMS, email, printed OTP lists, and PKI certificate authentication.checked 30 Sep 2026
- Deployment
- OpenOTP is offered for on-premise installation and as a cloud/SaaS service.checked 30 Sep 2026
- Directory integration
- The product supports local Active Directory and LDAP directories and lists integrations with Entra ID, DUO, Okta, Google, Ping Identity, and One Identity.checked 30 Sep 2026
- Federation and API
- Listed integration features include SAML, OpenID Connect, OAuth2, Kerberos, an ADFS plugin, Windows login plugin, RPC-based management API, and SIEM integration.checked 30 Sep 2026
- Intended customers
- RCDevs says it serves SMEs and large corporations across IT, finance, healthcare, and government sectors.checked 30 Sep 2026
- Notable limits
- The feature table marks LDAP Bridge OTP as currently unsupported in the listed editions and says SMS authentication requires SMS credits or an external SMS provider.checked 30 Sep 2026
- Purpose
- OpenOTP is an MFA server with OTP and FIDO2 for securing user network access.checked 30 Sep 2026
- Security features
- The feature list includes phishing protection, denial-of-service protection, intelligent geo-fencing, replay attack protection, leaked-password protection, and integrated PKI.checked 30 Sep 2026
- Support
- The feature table lists SLA and support services as optional, and RCDevs links to product documentation and community forums.checked 30 Sep 2026
- VPN and RADIUS
- The OpenOTP RADIUS Bridge provides a RADIUS API over OpenOTP web services and supports enterprise VPN appliances and EAP for Wi-Fi or NAC authentication.checked 30 Sep 2026
Money
- Free plan
- Yeschecked 20 Sep 2026
The company
- Headquarters
- Esch-sur-Alzette, Luxembourgchecked 28 Sep 2026
Where it runs
- Legacy LDAP applications
- The optional OpenOTP LDAP Bridge acts as a proxy to provide OTP login mechanisms for existing LDAP users and legacy applications.checked 30 Sep 2026
- Platform plugins
- RCDevs lists OpenOTP plugins for Windows login, Linux PAM, macOS PAM and login, ADFS, RDWeb Gateway, SimpleSAMLphp, and Nextcloud.checked 30 Sep 2026
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