The Best Proton Authenticator Alternatives in 2026

Generate two-factor authentication codes in Chrome, Firefox, or Edge with the Authenticator extension.

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.

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

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

Explore a map of connected devices and sensors, including environmental, weather, earthquake, wildlife, and vessel data.

APK Editor Studio changes Android app icons, titles, translations, and other resources on desktop computers.

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.

Windows program inspection is supported by x64dbg, an open source debugger for both x64 and x32 applications.

Observe and reprogram running programs with Frida’s dynamic instrumentation toolkit.

Intercept, inspect, and edit HTTP(S) traffic with HTTP Toolkit for debugging and testing.

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

Block hosts after repeated authentication errors with Fail2Ban, a daemon for monitoring failed logins.

Discover hosts and map networks with Nmap, a network exploration and security scanning tool.

Binary Ninja supports software reverse engineering and can be tried in a browser or installed as a desktop application.

Kismet monitors and captures Wi-Fi network traffic, with wireless intrusion detection and wardriving features.

Inspect HTTPS traffic interactively with mitmproxy, an open-source proxy tool.

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

OpenCVE tracks vulnerabilities, vendors, products, and weaknesses through searchable security records.

Obtain a certificate for a website with Certbot, which helps configure HTTPS.