OpenOTP Authentication Server

OpenOTP Authentication Server is a multi-factor authentication and identity-management platform for organizations securing access across cloud and on-premise environments. It suits teams that need varied login methods and directory connections; its dependence on WebADM makes it a poor choice for anyone seeking a standalone server.

Overview

OpenOTP brings authentication, identity integrations, and federated access together, with additional capabilities for network access control, mobile signatures, and badging. That range is useful for organizations securing more than one kind of access, but it also means the product is best evaluated as part of a broader deployment rather than as a simple second-factor tool.

Cloud and on-premise deployment provide flexibility about where the service runs. RCDevs serves SMEs and large corporations in fields including IT, finance, healthcare, and government. Whichever model an organization chooses, OpenOTP is a WebADM sub-package and cannot be installed by itself—a consequential prerequisite for teams planning their own infrastructure.

Key features

Authentication and access controls

Authentication options include mobile push, software and hardware tokens, OATH, SMS, email and secure email, smart-card certificates, secure magic links, YubiKey, and FIDO2 passkeys. Passwordless authentication, adaptive access policies, and device trust controls let organizations address more than a basic one-time-code workflow. The breadth is a strength for environments with different user or system requirements, though smaller teams with a single authentication need may not benefit from the full range.

Federation and integration

OpenOTP supports SAML, OpenID Connect, and OAuth, alongside RADIUS, LDAP proxy, ADFS and web plugins, and SOAP integration methods. Directory connections include Active Directory, LDAP, Entra ID, Okta, Google, Ping Identity, and One Identity. This combination suits organizations connecting authentication to a mixed directory and application estate. Desktop plugins cover Windows and macOS login, while PAM plugins are available for Linux and macOS.

Additional capabilities

EAP network access control, mobile electronic signatures, and mobile badging extend the server beyond login authentication. These functions may make OpenOTP relevant to organizations consolidating several access-related needs; buyers focused only on MFA should weigh that breadth against the WebADM deployment requirement.

Pricing

OpenOTP is paid software with a free plan and a 30-day trial. The cloud trial supports up to 250 OpenOTP users and 50 SpanKey hosts. The on-premise trial includes all features, two active-active high-availability servers, and up to 10 users for 30 days. The difference matters: cloud is the more generous evaluation for user capacity, while on-premise lets a team assess a high-availability setup.

The Enterprise prices are presented per user/month on a 250-user basis, while the price line gives an annual term; buyers should confirm the applicable quote for their deployment. Freeware saves the subscription cost but caps users and SpanKey hosts, limits the deployment to one non-HA server, and restricts support to documentation and the forum. Enterprise Edition adds HA and maintenance but not SLA support; the higher tier is the option with that support. Paid pricing is also available on request, and the product offers a 30-day trial.

Platforms

OpenOTP supports Android, iOS, Linux, macOS, and Windows, as well as self-hosted deployment. The platform range accommodates mobile users and desktop or server environments, while cloud and on-premise deployment give organizations a choice of operating model. The WebADM dependency remains a deployment consideration across those choices.

Who it's for

OpenOTP is a strong candidate for SMEs and larger organizations that need multiple authentication factors, federation, and connections to several directory providers. It is particularly relevant where access controls extend to network access, desktop login, or mobile signatures and badging. It is less suitable for individuals or small teams looking for a standalone authenticator, or for organizations unwilling to include WebADM in the deployment.

Pros and cons

• Pros: Broad factors, including FIDO2 passkeys, YubiKey, smart cards, and mobile push, serve environments with varied authentication needs.
• Pros: SAML, OIDC, OAuth, and integrations with major directory providers support mixed identity and application environments.
• Pros: Cloud and on-premise options, plus a 30-day trial in each model, let organizations evaluate different deployment approaches.
• Pros: Enterprise tiers include two active HA servers and maintenance; the SLA tier adds bug-reporting support.
• Cons: OpenOTP cannot run without WebADM, adding a required dependency for deployment planning.
• Cons: Freeware is limited to 25 users, 10 SpanKey hosts, and one server without HA; its SMS and e-Signature credits expire after one month.
• Cons: Freeware support is limited to documentation and forums, while the standard Enterprise tier has no SLA support.

Alternatives

For a broader comparison, browse the Multi-Factor Authentication Software directory.

• Protectimus MFA is another paid MFA option with a free plan and trial; consider it if you want to compare a separate MFA product and its listed Individual plan at $2 a month per user.
• LinOTP is a free alternative distributed under AGPLv3 and GPLv2, worth considering if an open-source option is the priority.
• LoginTC offers a free Cloud Starter plan for up to three users with VPN and firewall protection, making it an option for very small deployments.
• miniOrange Multi-Factor Authentication has a free plan starting at no cost, a possible fit for readers comparing entry-level MFA pricing.
• Spriv Adaptive MFA has a free Startup plan for up to two users and two servers, with SMS charged at carrier cost; consider it for a very small starting deployment.
• WiKID offers a free strong authentication server plan for up to five users, an option to consider when that user cap fits.
• Entrust Identity App is free to download, but activation requires an organization using Identity Enterprise.
• Duo Mobile has a free plan for 10 users and a $3 a month Essentials plan; consider it if those plans better match your team size and budget.

Verdict

Choose OpenOTP if your organization needs a wide choice of authentication methods, federation, and directory integrations, with cloud or on-premise deployment and optional high availability. Its most important advantage is the breadth of access controls; its main drawback is that WebADM is mandatory, while free and standard Enterprise support remain limited. Teams that need a standalone server or SLA support should look elsewhere or budget for Enterprise Edition + SLA.