2fa

An extra step of security never hurt anybody. Enable two-factor authentication on your online accounts and let Authenticator App by 2Stable do the rest.

freemium $49.99 / Annually (Unlimited Accounts. Encrypted Backup and Synchronisation.)

Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.

Google Authenticator is a multifactor app for mobile devices.

free

One app to quickly and securely verify your identity online, for all of your accounts.

Duo Security provides cloud-based two-factor authentication. Duo’s technology can be deployed to protect users, data, and applications from breaches, credential theft, and account takeover.

Signata is a cryptocurrency wallet service that uses your YubiKey to protect your keys

Simple 2FA Authenticator - Generate Two Factor Authentication tokens.

3-factor authentication app that uses voice biometrics as a third factor.

Web-based 2FA authenticator. Securely share access, no phone needed.

paid Free Trial $19.0 / Monthly (incl. 3 users)

SMS API and WhatsApp Business API

freemium $13.0 / Monthly

Proximity passwords for PC, Mac, websites, and desktop applications. Get instant authentication with GateKeeper wireless, hands-free security key. Anti-phishing, secure, passwordless, proximity-based wireless access token for computers/websites.

paid $3.0 / Monthly (per User)

Protectimus multi-factor authentication solution is powerful and flexible, and scales to meet the needs of any business

freemium

Send and receive text messages globally with Twilio SMS.