LinOTP
LinOTP: A flexible open-source MFA server for teams integrating varied OTP and authentication methods. Ranked #30 of 54 in Multi-Factor Authentication Software by our editors (6.3/10); pricing: Free plan; best for open-source OTP infrastructure.
At a glance
- Editor score6.3 / 10
- PricingFree plan
- Best forOpen-source OTP infrastructure
- Free planYes
- Paid fromFree
- Facts checked23 Sep 2026
Where it wins
- Broad OTP, challenge-response, YubiKey, and FIDO U2F support
- Self-service token administration with signed audit logging
- APIs, identity resolvers, PAM, RADIUS, SAML, and other integrations
Where it doesn't
- FIDO U2F support is provided through the web API
- Self-hosted deployment requires server and identity-integration management
- Broad token and policy coverage can increase administration complexity
Our verdict on LinOTP
LinOTP is an open-source multi-factor authentication server maintained by netgo software GmbH. It is designed for organizations that need to deploy authentication within existing infrastructure rather than adopt a narrowly focused token service. The platform supports web, Linux, Windows, iOS, Android, and API-based environments, with hybrid deployment options. Its scope covers token management, authentication policies, enrollment, administration, self-service, audit logging, and integration APIs.
Integration breadth is a central strength. LinOTP connects with LDAP and Active Directory, SQL, and other identity stores through user identity resolvers. Its HTTP/JSON APIs cover management, authentication, self-service, user resolvers, and audit functions. Application and access integrations include PAM, RADIUS, SAML, OpenVPN, SSH, Apache, and WordPress. High-availability and load-balancing support also suit deployments that need distributed service operation. Teams should expect to map these interfaces to their existing identity and access architecture rather than treat LinOTP as an isolated application.
The factor range is unusually broad within this product’s stated scope. LinOTP supports HOTP, TOTP, mOTP, OCRA, SMS, email, push, QR challenge-response, YubiKey, and FIDO U2F, alongside other token types. Its policy framework covers authentication, authorization, enrollment, and administration, while the self-service portal handles enrollment, disabling, deletion, PIN changes, and resynchronization. Signed audit logs record authentication and management actions. LinOTP is a strong fit for technical teams seeking open-source OTP infrastructure with detailed control. Organizations wanting a simpler, fully managed experience may prefer a product with less server and policy administration.
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LinOTP pricing
LinOTP fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Deployment | Self_hosted |
| Supported factors | OATH OTP (HOTP/TOTP), YubiKey, SMS, email, voice, push, QR, challenge-response, static password |
| App integration methods | Web API, PAM module, RADIUS modules/connectors, simpleSAMLphp module |
| Adaptive access policies | Not verified |
| Passwordless authentication | Not verified |
| Device trust controls | Not verified |
| Deployment | Self-hosted |
| Platforms | Web, Linux |
| Compliance & security | PCI DSS |
| Support | Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 7 integrations: PAM, FreeRADIUS, Radiator, simpleSAMLphp, LDAP, Active Directory … |
| Pricing | Free plan |
| Website | linotp.org |
| Facts checked | 23 Sep 2026 |
LinOTP integrations
LinOTP lists 7 integrations on its own site.
- PAM
- FreeRADIUS
- Radiator
- simpleSAMLphp
- LDAP
- Active Directory
- SQL databases
Alternatives to LinOTP
- 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
Also Ranked In
LinOTP is ranked in 2 of our directories.
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Featured on iTechGuides
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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