OpenOTP Authentication Server

OpenOTP Authentication Server brings a broad set of authentication and access controls to organizational deployments. It suits teams that need to connect multiple identity directories and federated applications; the WebADM dependency is a meaningful drawback for anyone seeking a standalone server.

Overview

OpenOTP combines multi-factor authentication and identity management with cloud or on-premise deployment. Its range of factors, directory connections, and federation options makes it a plausible fit for organizations with varied access requirements, while the requirement to install it as a WebADM sub-package adds a platform dependency that buyers must plan around.

RCDevs positions its security solutions for SMEs and large corporations in IT, finance, healthcare, and government. Those are settings where different teams and systems may need different access methods. For a small deployment with a narrow authentication need, the breadth may be unnecessary complexity.

Key features

Authentication and access controls

OpenOTP supports mobile push, software and hardware tokens, OATH, SMS, email and secure email, as well as smart-card certificates, secure magic links, YubiKey, and FIDO2 passkeys. Passwordless authentication, adaptive access policies, and device trust controls expand the options for controlling access beyond a basic second-factor prompt. This range is useful when an organization needs to accommodate different users or systems, but teams should weigh that flexibility against the work of deploying and managing a WebADM-based server.

Federation and integrations

Federated access includes SAML, OIDC, and OAuth. OpenOTP integrates with Active Directory, LDAP, Entra ID, Okta, Google, Ping Identity, and One Identity, and supports integration through RADIUS, LDAP proxy, SAML2, OpenID Connect, OAuth, an ADFS plugin, web plugins, and SOAP. That breadth can help organizations connect authentication to an existing identity environment rather than relying on a single directory or protocol.

Additional capabilities

The server also provides EAP network access control, mobile electronic signatures, and mobile badging. These capabilities may make OpenOTP more relevant to organizations securing network access or supporting mobile workflows; they are less compelling for a buyer who only needs a basic authenticator.

Pricing

OpenOTP has a free plan and paid plans, with 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 HA servers, and up to 10 users for 30 days. That means the cloud trial offers a substantially larger user allowance, while the on-premise option lets teams evaluate a high-availability setup.

Plan	Price	What it includes
Freeware	free	25 users, 10 SpanKey hosts, one year, one server with no HA, 20 SMS credits and 20 e-Signature credits (each valid for one month), and documentation and forum support.
Enterprise Edition	€1.90 a year	Shown per user/month, based on 250 users; 40 SpanKey hosts, two active servers with HA, maintenance, all integrations and authentication methods, and no SLA support.
Enterprise Edition + SLA	€2.28 a year	Shown per user/month, based on 250 users; 40 SpanKey hosts, two active servers with HA, maintenance, all integrations and authentication methods, and SLA support for bug reporting.

Freeware is a fit for a small deployment that can work within 25 users, 10 hosts, and a single server without HA. Its monthly credit validity and limited support are important constraints. The Enterprise plans raise the host allowance to 40, include HA and maintenance, and provide all integrations and authentication methods; the higher-priced SLA tier adds SLA support for bug reporting. The paid prices are shown per user/month based on 250 users and billed annually, so organizations should confirm the commercial terms for their own deployment.

Platforms

OpenOTP supports Android, iOS, Linux, macOS, and Windows, as well as self-hosted deployment. RCDevs offers Windows and macOS login plugins and PAM plugins for Linux and macOS, which gives desktop administrators options for integrating logins. Platform breadth does not remove the WebADM installation requirement.

Who it's for

OpenOTP is best suited to organizations that need multiple authentication methods, federated access, and connections to existing directories, particularly where cloud and on-premise deployment choices matter. Its trial limits and free tier give smaller teams a way to assess fit, but the no-HA Freeware setup and WebADM dependency may make it a poor match for buyers looking for a simple, independent authentication server.

Pros and cons

• Broad factor choice: Mobile push, passkeys, tokens, smart cards, and other methods let organizations support varied authentication needs.
• Wide integration scope: Multiple federation protocols, directory connections, and app integration methods can fit into diverse identity environments.
• Cloud and on-premise options: Organizations can consider either deployment model, with a 30-day trial for each.
• WebADM is required: OpenOTP cannot be installed by itself, adding a deployment dependency.
• Freeware has operational limits: Its 25-user and 10-host caps, single server without HA, short-lived credits, and forum/documentation support constrain its use.

Alternatives

Multi-Factor Authentication Software is the broader category for comparing options. Consider Protectimus MFA if its individual plan at $2 a month better fits your budget or deployment needs. LoginTC is worth considering for a free cloud start capped at three users, with VPN and firewall protection. WiKID offers a free server plan for up to five users. LinOTP is the alternative to consider if you want free open-source software under AGPLv3 and GPLv2. miniOrange Multi-Factor Authentication has a free plan starting at $0 per month. Spriv Adaptive MFA offers a free Startup plan for up to two users and two servers, with SMS usage billed at carrier cost. Duo Mobile has a free plan for 10 users and paid Essentials at $3 a month. Entrust Identity App is free to download, but activation requires an organization using Identity Enterprise.

Verdict

Choose OpenOTP if your organization needs a wide selection of authentication factors, directory integrations, and federation options in a cloud or on-premise deployment. Its broad access toolkit and HA-capable paid plans are the main reasons to shortlist it. Look elsewhere if you need a standalone server or a lightweight setup that does not depend on WebADM.