Freedom251 › Multi-Factor Authentication Software
multiOTP
What multiOTP is
multiOTP is self-hosted, RADIUS-based authentication software for VPN authentication, SSL-VPN connections, and extranet portals. It runs as an on-premise standalone appliance without a cloud connection. Supported factors include OATH TOTP and HOTP, mOTP, YubiKey, SMS, TAN or scratch passwords, and hardware tokens; the maker says it is certified for OATH TOTP and HOTP. Smartphone apps for iPhone and Android are also described.
Integration options include RADIUS, a web service, REST API, PHP library, command-line interface, and Active Directory or LDAP synchronization. It can create a PDF with a QR code for each new user, and users can synchronize tokens during authentication. Pro and Entreprise add automatic directory synchronization and password-prefix options. Entreprise adds two-appliance master-slave high availability, push notifications, and REST API support. The free plan is available. The appliance requires 4 GB RAM and 16 GB storage and uses a Debian-based operating system.
Who it suits
It suits organizations seeking on-premise RADIUS authentication for VPNs or extranet portals, with token and directory integration options. Pro and Entreprise offer different user limits and capabilities.
What it does well
- Free plan available.
- Supports multiple token and authentication factors.
- Works with RADIUS, APIs, and directory synchronization.
- Creates QR-code PDFs for new users.
- Entreprise supports two-appliance high availability.
What to know first
- No cloud connection for the standalone appliance.
- Appliance requires 4 GB RAM and 16 GB storage.
- Pro is limited to 500 users.
- Enterprise renewal is needed for updates and mail support.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Hardware Device | Price (with VAT) · Only available in Switzerland · 20 lifetime 5.x user licences included · Upgradable up to 500 users | 499 CHF, paid once |
| Pro | One license per active user; no annual fee. Major version upgrades cost 30% of installed licenses. · Up to 500 users · Mail support and current major version firmware updates included | On request |
| Entreprise | One license per active user; annual renewal fee is 20% of installed licenses. · Up to 100’000 users · Mail support and firmware updates require renewal | On request |
As multiotp.com lists them, read 11 Oct 2026. The maker's own page has the final word.
Verdict
multiOTP offers a broad set of authentication factors and integration methods in an on-premise appliance. Compare plan limits and renewal terms with the capabilities your organization needs.
Facts from multiOTP's own pages
- Authentication
- The maker states that the software is OATH TOTP and HOTP certified. · multiotp.com, 11 Oct 2026
- Backups
- The product page lists automatic scheduled FTP or email backups. · multiotp.com, 11 Oct 2026
- Deployment
- The product is offered as an on-premise standalone appliance with no cloud connection. · multiotp.com, 11 Oct 2026
- Directory integration
- Pro and Entreprise include automatic AD / LDAP user synchronization and allow AD / LDAP passwords as a prefix instead of PIN codes. · multiotp.com, 11 Oct 2026
- Downloads
- The download page lists Proxmox, OVA, and Hyper-V appliances, an Enterprise Raspberry Pi image, and a Windows Credential Provider. · download.multiotp.com, 11 Oct 2026
- Enterprise capabilities
- Entreprise includes master-slave high availability with two appliances, a REST API, and push notification support. · multiotp.com, 11 Oct 2026
- Integrations
- The maker names firewalls, Apache HTTP Server, and OpenSSH as examples of systems that implement RADIUS. · multiotp.com, 11 Oct 2026
- Purpose
- multiOTP is RADIUS-based and can be used for VPN authentication, SSL-VPN connections, and extranet portals. · multiotp.com, 11 Oct 2026
- Resource requirements
- The appliance is listed as requiring 4 GB RAM and 16 GB storage and uses a Debian-based operating system. · multiotp.com, 11 Oct 2026
- Support
- Pro includes mail support and firmware updates for the current major version; Enterprise renewal is needed for new firmware updates and mail support. · multiotp.com, 11 Oct 2026
- Tokens
- It supports OATH hardware tokens, and its product page describes smartphone apps for iPhone and Android. · multiotp.com, 11 Oct 2026
- User limits
- The comparison lists a maximum of 500 users for Pro and 100'000 users for Entreprise. · multiotp.com, 11 Oct 2026
- User provisioning
- It generates a PDF with a QR code for each new user and supports self-service token synchronization during authentication. · multiotp.com, 11 Oct 2026
Where multiOTP stands on Freedom251
- Multi-Factor Authentication Software#11 of 52