Trustworthy, encrypted, command-line TOTP/HOTP authenticator app with import functionality.

Time-Based One-Time Password (TOTP) and HMAC-Based One-Time Password (HOTP) library for Go.

web service and api with free phone numbers from various providers in one place

Generate TOTP secrets and codes to use while making and testing software secured by TOTP MFA/2FA.

jCat One Time Password Manager

A TOTP code generator for the CLI that securely stores secrets in the keychain

Python script to dump 2fa pin from Android FreeOTPPlus (FreeOTP+) export file freeotp-backup.json

Command line Google Authenticator alternative. Or, Command line Script for managing 2FAs.

A time-base one time password generator for Mac (TOTP)

Web-App to share TOTP with a group of people.

🔑 Command-line tool for managing Time-based One-Time Passwords (TOTPs).

Java implementation of TOTP

Cross-platform desktop application for generating TOTP codes

Time based OTP (TOTP) generation for 2-factor authentication like Google Authenticator without backend

Operation system for boards. The Operating System allows you to use the board as a security key.

Debugging tool for time-based one-time password (TOTP).

Alternative security options

Local TOTP Generator is an offline tool for generating time-based one-time passwords (TOTPs) using the Web Crypto API. With customizable settings for digit length, period, and algorithm, it's perfect for secure 2FA testing, temporary access setups, and quick authentications without compromising your secret key.

Implementation of HOTP and TOTP as per the RFC RFC4226 and RFC6238 respectively

A browser based TOTP client.