OpenOTP Authentication Server
OpenOTP Authentication Server: A broad self-hosted MFA server for organizations that need PKI and federation. Ranked #12 of 54 in Multi-Factor Authentication Software by our editors (8.1/10); pricing: Free plan · 30-day trial; best for self-hosted authentication with PKI.
At a glance
- Editor score8.1 / 10
- PricingFree plan · 30-day trial
- Best forSelf-hosted authentication with PKI
- Free planYes
- Adaptive access policiesYes
- Facts checked23 Sep 2026
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
Our verdict on OpenOTP Authentication Server
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.
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OpenOTP Authentication Server pricing
OpenOTP Authentication Server fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Not verified |
| Deployment | Not verified |
| Supported factors | Mobile push; FIDO2/passkeys; PKI certificates/smart cards; OATH software and hardware tokens; YubiKey; secure magic links; email OTP; SMS OTP; printed OTP lists |
| App integration methods | RADIUS; LDAP; Windows Credential Provider; macOS Credential Provider; Linux PAM; SAML; OpenID Connect; ADFS plugin; application plugins |
| Adaptive access policies | Yes |
| Passwordless authentication | Yes |
| Device trust controls | Yes |
| Free trial | 30 days · no card needed |
| Deployment | Cloud, Self-hosted |
| Platforms | Web, Windows, macOS, Linux, iOS, Android |
| Support | Docs, Community |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 11 integrations: Active Directory, LDAP, Entra ID, Duo, Okta, Google … |
| Pricing | Free plan · 30-day trial |
| Website | openotp.com |
| Facts checked | 23 Sep 2026 |
OpenOTP Authentication Server integrations
OpenOTP Authentication Server lists 11 integrations on its own site.
- Active Directory
- LDAP
- Entra ID
- Duo
- Okta
- Ping Identity
- One Identity
- RADIUS
- SAML
- OpenID Connect
Alternatives to OpenOTP Authentication Server
- Cisco Duo PasswordlessA broad MFA platform with a capable free tier and paid passwordless access.9.4
- miniOrange Multi-Factor AuthenticationBroad MFA coverage for mixed environments, with adaptive access and passwordless options.9.3
- LoginTCA flexible MFA platform with broad factors, offline access, and multiple deployment options.9.1
See all OpenOTP Authentication Server alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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