Find which websites support two-factor authentication and what methods they offer in this directory.
SSL for Free vs OTP Auth
How do SSL for Free and OTP Auth compare? Here are the facts side by side: pricing, platforms, open-source status and what each one is for.
| Directory detail | SSL for Free | OTP Auth |
|---|---|---|
| What it is | SSL for Free provides SSL and wildcard certificates for enabling HTTPS on websites. | Manage two-factor authentication codes with OTP Auth, an iOS app listed on the App Store. |
| Website | ||
| Type | Website | Website |
| Topic | ||
| Pricing | Free | Freemium |
| Platforms | Web | iOS, Web |
| Open source | Not stated | Not stated |
| Language | English | English |
| Alternatives |
Other options to consider
Sites similar to both SSL for Free and OTP Auth.
Generate secure SSL configurations for selected web, database, and mail software.
Lucia was deprecated in March 2025. The website was updated in July 2026 and points to code/auth_session.ts as a single-file replacement for the NPM package and to the Auth Book for auth information.
Use Metasploit to find security issues, verify mitigations, and manage authorized penetration testing assessments.
Solve reverse engineering challenges published on challenges.re, a challenge-focused site.
GoPlus offers Web3 security tools including audits, APIs, a user security hub, and a browser extension.






