The Best Authenticator Alternatives in 2026

Manage two-factor authentication codes with OTP Auth, an iOS app listed on the App Store.

Store, generate, and organize one-time password codes with 2FAuth, a self-hosted manager for individuals and teams.

Find which websites support two-factor authentication and what methods they offer in this directory.

Generate two-factor authentication codes with Proton Authenticator across supported devices, including phones and computers.

Generate secure SSL configurations for selected web, database, and mail software.

GoPlus offers Web3 security tools including audits, APIs, a user security hub, and a browser extension.

Manage two-step verification tokens on Android with Aegis Authenticator, a free, open-source app.

CheckFileType identifies unknown files without extensions by analyzing their contents.

Online Color Picker lets users select colors and view values such as RGB, HSL, and hexadecimal codes.

SSLMate CAA helps generate CAA DNS records and explains which certificate authorities support the record type.

Facia provides deepfake and liveness detection for identity verification and authentication.

This WebAuthn guide explains an authentication API intended to replace passwords with stronger authentication.

Build authentication into applications with Better Auth, an authentication framework.

Solve reverse engineering challenges published on challenges.re, a challenge-focused site.

Search the National Vulnerability Database, a public resource for vulnerability information.

View Toronto Police calls for service on a map that updates in real time, according to the supplied page description.

Add proof-of-work verification to websites with mCaptcha, a privacy-focused automated CAPTCHA system.

WhatsMyDNS checks DNS record propagation across global resolvers for record types including A, AAAA, MX, and TXT.

Use Metasploit to find security issues, verify mitigations, and manage authorized penetration testing assessments.

The Snyk Security Database provides vulnerability details and remediation guidance for packages and cloud configurations.

The URL Decoder and Encoder converts text between encoded and decoded forms, including JavaScript URLs.

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.

DNSPerf compares the performance and uptime of enterprise and commercial DNS providers.

Search a community-curated collection of bug bounty writeups and learning resources.