LinOTP

LinOTP is an open-source multi-factor authentication platform for organizations that want to manage authentication infrastructure themselves. It suits teams connecting varied directories and applications, especially where offline Windows login matters. Its flexibility is a strength, but Linux installation choices and the need to arrange support make it less straightforward for teams seeking a turnkey service.

Overview

Developed and maintained by netgo software GmbH, LinOTP is intended for deployments from small installations to enterprises with thousands of users, including distributed setups. That range makes it a candidate for organizations consolidating authentication across sites and systems, rather than a narrowly scoped login tool.

The platform's architecture is auditable, and its signed audit log records authentication and management actions; LinOTP describes the log as tamper-proof. It also cites support for requirements associated with GDPR, ISO 27001, NIS2, BSI IT-Grundschutz, PSD2, and PCI-DSS. These capabilities can help organizations with formal security obligations, but do not by themselves establish compliance for a particular deployment.

Key features

Factors and integrations

LinOTP supports OATH TOTP and HOTP, mOTP, OCRA, SMS and email OTP, push, QR, YubiKey, FIDO U2F, and WebAuthn, as well as remote, forwarding, static-password, and daily-password methods. This breadth gives administrators options for different users and access scenarios, though it also means choosing and managing an appropriate factor mix.

Integration routes include HTTP/JSON API, PAM, RADIUS, SAML, OpenVPN, SSH, Apache, and WordPress. Protocol support includes OIDC and ADFS as well as SAML and RADIUS. LinOTP connects to Active Directory and LDAP, and to SQL databases including PostgreSQL, MySQL, MariaDB, Oracle, and DB2. Organizations with an established mix of identity stores and applications have several ways to connect them without relying on a single protocol.

Self-service and offline access

Users can register, manage, and reset tokens through a self-service portal, and hardware tokens can be resynchronized automatically. That can reduce routine administrator involvement. LinOTP also describes offline authentication for Windows users without a permanent internet connection, a useful distinction for environments where connectivity cannot be assumed.

Deployment and operations

Deployment options include a virtual appliance for common hypervisors and containers for Kubernetes and other orchestration platforms. The Linux installation picture is less uniform: the LinOTP 3 download page lists Debian 10 Buster packages, RPM packages are currently for LinOTP 2, and other distributions may require source or pip installation. Teams should weigh that variation against their operating-system standards before adopting it.

Pricing

LinOTP open-source software costs nothing under AGPLv3 and GPLv2. This is the fit for organizations able to operate and maintain the platform themselves. A demo license also costs nothing; it is a test deployment arranged by request with the LinOTP team, rather than a self-serve trial with a stated duration.

Paid support offerings include SLA-backed support contracts, software subscriptions, integration services, possible 24/7 emergency response, SaaS, training, and remote or on-site help. These suit teams that need operational assistance or a hosted option, but require custom pricing. The open-source option avoids a stated software price while leaving deployment and administration to the organization.

Platforms

LinOTP supports Android, iOS, Linux, Windows, web, API, and self-hosted environments. Its appliance and container options give infrastructure teams alternatives, although the Linux package differences may affect the effort of fitting it into a particular distribution.

Who it's for

LinOTP is best suited to organizations that want control over MFA infrastructure and need multiple factors, directory connections, and application integration paths. Its scale and distributed deployment support make it relevant to larger environments, while offline Windows authentication serves sites with intermittent connectivity. It is a weaker fit for teams that want a consistent packaged installation across Linux distributions or do not want to operate authentication services themselves.

Pros and cons

Pros: Broad factor and protocol support accommodates varied users, applications, and identity stores.

Pros: Self-service token management and automatic hardware-token resynchronization can reduce routine administration.

Pros: Open-source licensing and self-hosted deployment offer control over the authentication environment.

Cons: LinOTP 3 packages are listed for Debian 10, while RPM packages are for LinOTP 2; other distributions may need source or pip installation.

Cons: Operational assistance, SaaS, and related services are paid offerings with custom pricing.

Alternatives

Compare multi-factor authentication software if you want to survey the category before settling on a platform.

Protectimus MFA is worth considering for per-user pricing, with an individual plan at $2 a month and a $33 a month Starter plan. HYPR Authenticate has a $3 a month Identity Assurance Access plan that includes web access and phishing-resistant onboarding. LoginTC offers a free Cloud Starter plan for up to 3 users, including VPN and firewall protection, making it a possible fit for a small team seeking a capped free option.

miniOrange Multi-Factor Authentication has a free plan and a $2 a month Essential plan; Spriv Adaptive MFA offers a free Startup plan for up to 2 users and 2 servers, with SMS charged at carrier cost. Deepnet DualShield MFA Platform is another option for on-premises or private-cloud deployments, with a quote required. Duo Mobile has a free plan for 10 users and a $3 a month Essentials plan. WatchGuard FireCloud may suit buyers seeking a paid internet-access product; its 1–50 license, one-year plan costs $97.75 a year.

Verdict

Choose LinOTP if your organization wants open-source control over MFA, needs a broad range of factors and integrations, and can run the service itself. Its clearest advantages are integration breadth, self-service, and deployment flexibility; look elsewhere if uniform Linux packages or a managed operating model are priorities.