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.
OTP Auth
vschallenges.re
OTP Auth vs challenges.re
How do OTP Auth and challenges.re compare? Here are the facts side by side: pricing, platforms, open-source status and what each one is for.
| Directory detail | OTP Auth | challenges.re |
|---|---|---|
| What it is | Manage two-factor authentication codes with OTP Auth, an iOS app listed on the App Store. | Solve reverse engineering challenges published on challenges.re, a challenge-focused site. |
| Website | ||
| Type | Website | Website |
| Topic | ||
| Pricing | Freemium | Not confirmed |
| Platforms | iOS, Web | Web |
| Open source | Not stated | Not stated |
| Language | English | — |
| Alternatives |
Other options to consider
Sites similar to both OTP Auth and challenges.re.
Add proof-of-work verification to websites with mCaptcha, a privacy-focused automated CAPTCHA system.
Use Metasploit to find security issues, verify mitigations, and manage authorized penetration testing assessments.
Generate secure SSL configurations for selected web, database, and mail software.
Pick
24 alternatives
GoPlus offers Web3 security tools including audits, APIs, a user security hub, and a browser extension.
Search the National Vulnerability Database, a public resource for vulnerability information.