Side by side
2FAS Auth vs OpenOTP Authentication Server
Both stand on authenticator apps. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Choose 2FAS Auth if you want a free, open-source authenticator that works offline and connects to supported browser extensions. Its setup depends on a compatible mobile app for pairing and confirming extension token requests.
Visit 2FAS Auth
Choose OpenOTP if you need MFA for network access with a choice of deployment, authentication methods and directory integrations. Its free on-premise option is for fewer than 25 users on one server; teams needing high availability or supported LDAP Bridge OTP should review the edition limits.
Visit OpenOTP Authentication ServerThe facts
| 2FAS Auth | OpenOTP Authentication Server | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Android, Extension, iPhone | Android, API, iPhone, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 1 | 7 |
| Maker | Not published | OpenOTP Authentication Server |
| Website | 2fas.com | rcdevs.com |
| On authenticator apps | #16 of 111 | #20 of 111 |
2FAS Auth: what it does well
- Supports TOTP and HOTP codes and works offline.
- Mobile apps and extensions cover iOS, Android, Chrome, Brave, Firefox, Edge, Opera, and Safari.
- Extension communication is end-to-end encrypted with no unencrypted fallback.
- Encrypted backup and token synchronization are available.
- Open-source code can be reviewed by independent security experts.
What to know first
- The mobile apps require iOS 18.6 or later, or Android 9.0 or later.
- Browser extensions must be paired with the mobile app using a QR code.
- The free project is supported by donations.
OpenOTP Authentication Server: what it does well
- Supports passkeys, FIDO2, push, TOTP, SMS and email authentication.
- Offers on-premise and cloud/SaaS deployment.
- Connects with local Active Directory and LDAP directories.
- Includes SAML, OpenID Connect, OAuth2 and Kerberos federation.
- Free on-premise plan covers under 25 users and one server.
What to know first
- On-premise freeware is limited to one server and has no HA.
- SMS authentication requires credits or an external SMS provider.
- LDAP Bridge OTP is marked unsupported in the listed editions.
- SLA and support services are optional.
Alternatives to 2FAS Auth Alternatives to OpenOTP Authentication Server The whole list