Open Authenticator

Open Authenticator

Open Authenticator is a free and open source two-factor authentication app for Android and iOS. It allows users to generate time-based one-time passwords compatible with Google Authenticator and similar apps for two-factor authentication. It provides an easy way to improve the se
Security & Privacy Two-Factor Authentication
Open Authenticator image
open-source timebased-onetime-passwords compatible-with-google-authenticator twofactor-authentication android ios
Open Authenticator alternatives ➤

Open Authenticator: Free 2FA App for Android & iOS

Open Authenticator is a free and open source two-factor authentication app for Android and iOS. It allows users to generate time-based one-time passwords compatible with Google Authenticator and similar apps for two-factor authentication. It provides an easy way to improve the security of your online accounts.

What is Open Authenticator?

Open Authenticator is a free, open source two-factor authentication application available for Android and iOS. It allows users to set up two-factor authentication for online accounts by generating time-based one-time passwords compatible with services like Google Authenticator, Authy, and Microsoft Authenticator.

The app is designed to provide an easy way for users to improve the security of their online accounts by enabling two-factor authentication. It can generate OTP codes for logins, as well as verify codes for account recovery. The codes are generated based on the industry standard Time-based One-time Password Algorithm (TOTP), as described in RFC 6238.

As an open source application, Open Authenticator emphasizes transparency, privacy, and trust. All code is available for review and audit under the GPLv3 license. The app does not collect any user analytics or personal data. Local encrypted backups help prevent lockout in case of lost devices.

Overall, Open Authenticator delivers an essential security tool for individuals to safeguard their online presence. With its focus on openness and ease of use, it makes enabling two-factor authentication as accessible as possible for everyday users looking to improve their account security.

Open Authenticator Features

Features

  1. Generate time-based one-time passwords (TOTP) compatible with Google Authenticator
  2. Support for multiple accounts
  3. Encrypted local storage of secrets
  4. Open source codebase
  5. Available on Android and iOS

Pricing

  • Open Source

Pros

Free and open source

Simple and easy to use interface

Works offline

Actively maintained

Cons

Limited to TOTP codes only

No cloud sync or backup options

Fewer customization options compared to some apps

Official Links

Official Website
https://code.google.com/r/vinblau-google-auth-s...

The Best Open Authenticator Alternatives

Top Security & Privacy and Two-Factor Authentication and other similar apps like Open Authenticator

Here are some alternatives to Open Authenticator:

Authy icon
Authy
Google Authenticator icon
Google Authenticator
Microsoft Authenticator icon
Microsoft Authenticator
FreeOTP icon
FreeOTP
2FA Authenticator (2FAS) icon
2FA Authenticator (2FAS)
Aegis Authenticator icon
Aegis Authenticator
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Authy icon

Authy

Authy is a two-factor authentication application developed by Twilio that provides enhanced security for logging into online accounts. It works by associating your mobile device with your online accounts so that a second one-time passcode generated by the Authy app is required in addition to your regular account password when...
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Google Authenticator icon

Google Authenticator

Google Authenticator is a software-based authenticator app developed by Google for multi-factor authentication by generating timed one-time passwords. It can be used to enhance the security of user logins to applications and online accounts by requiring users to provide both their regular account password as well as a 6-digit one-time...
Google Authenticator image
Microsoft Authenticator icon

Microsoft Authenticator

Microsoft Authenticator is a free multi-factor authentication app developed by Microsoft that adds an extra layer of account security for personal and work Microsoft accounts. It works by requiring the user to provide both their account password and a verification code generated by the Authenticator app when signing in, preventing...
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FreeOTP icon

FreeOTP

FreeOTP is an open source, free two-factor authentication application for Android and iOS devices. It allows users to generate time-based one-time passwords (TOTP) for added login security to websites and other services that support TOTP authentication.Some key features of FreeOTP include:Open source code and free to useSupports secure password generation...
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2FA Authenticator (2FAS) icon

2FA Authenticator (2FAS)

2FA Authenticator (2FAS) is a free and open-source two-factor authentication mobile app. It allows users to set up two-factor authentication for their online accounts in order to add an extra layer of security beyond just a password.Some key features of 2FA Authenticator include:Support for common 2FA standards like Time-based One-time...
2FA Authenticator (2FAS) image
Aegis Authenticator icon

Aegis Authenticator

Aegis Authenticator is a free and open source two-factor authentication app for Android. It provides enhanced security for your online accounts by requiring a second one-time password in addition to your regular login password when accessing important services.Some of the key features of Aegis Authenticator include:Support for common 2FA methods...
Aegis Authenticator image
OTPClient icon

OTPClient

OTPClient is a free, open source two-factor authentication (2FA) client that runs on Linux, macOS and Windows. It supports the most common types of 2FA including time-based one-time passwords (TOTPs) and HMAC-based one-time passwords (HOTPs).By scanning a QR code from services like GitHub, Google, Facebook etc., OTPClient can generate 6...
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AndOTP icon

AndOTP

andOTP is a free, open-source two-factor authentication application for Android. It enables users to generate one-time passwords for logins to provide an additional layer of account security beyond just a password.Some of the key features of andOTP include:Support for both time-based algorithms (TOTP) and counter-based algorithms (HOTP)Encrypted backups that allow...
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FreeOTP+ (fork of FreeOTP) icon

FreeOTP+ (fork of FreeOTP)

FreeOTP+ is a fork of the popular open source two-factor authentication (2FA) app called FreeOTP for Android. It was created to add additional features that were not present in the original FreeOTP app.Like FreeOTP, FreeOTP+ generates time-based one-time passwords (TOTP) for two-factor authentication. It supports both HMAC-SHA1 and HMAC-SHA256 algorithms...
FreeOTP+ (fork of FreeOTP) image
Authenticator Extension icon

Authenticator Extension

The Authenticator Extension is a free, open source browser extension used for two-factor authentication (2FA) and one-time passwords (OTP). It allows users to manage and generate 2FA/OTP codes for secure logins, without requiring a separate authentication mobile app.The extension supports integration with popular sites and services like Google, Facebook, Github,...
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Toopher icon

Toopher

Toopher is a cloud-based multi-factor authentication service designed to enhance login security for websites and applications. It works by requiring users to present two or more authentication factors when signing in - typically something they know (like a password), something they have (like a mobile device or security key), and...
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SecKey icon

SecKey

SecKey is an open source, self-hosted password manager and secure digital vault application. It allows individuals and teams to securely store passwords, sensitive information, credentials, and other digital valuables in an encrypted vault that is accessible through a web interface.Some key features of SecKey include:Secure encryption (AES-256 + RSA) to...
OTPmanager icon

OTPmanager

OTPmanager is an open-source, self-hosted one-time password manager application that allows users to conveniently store, generate, and manage one-time passcodes (OTPs) for multi-factor authentication across their various online accounts and services that support two-factor authentication.It provides a simple and intuitive user interface to securely store OTP secrets, which are encrypted...