Apps similar to Proton Authenticator include Bitwarden, which is open source with a free version. Other options are KeePassXC, KeePass, Aegis Authenticator and Ente Auth. You're spoiled for choice with Authenticators like Proton Authenticator: we list more than 50 alternatives for Android, iPhone, iPad, Windows and Mac.
Kerveros is a robust two-factor authentication code generator that combines ease of use with enterprise-grade security. It generates time-based one-time passwords (TOTP) for your online accounts while keeping your secrets encrypted and protected.
Germany
EU
Coffer is a self-hosted, multi-user authenticator vault. It generates TOTP codes in the browser and encrypts each user's vault before storing it on the server. It also supports QR imports, groups, backups, and 2fas transfers.
Türkiye
2faConsole is a lightweight, cross-platform two-factor authentication (2FA) console application built with C# .NET. It uses the dependency-free Pxoqxo.Otp2fa library to provide secure, terminal-based OTP management.
ExpressKeys is a secure password manager from the makers of ExpressVPN. Store, autofill, and protect your passwords, credit cards, and sensitive data in a secure vault with end-to-end, zero-knowledge encryption across all your devices.
British Virgin Islands
Unlimited two-factor codes for free, plus tap-to-approve push sign-ins and built-in passkeys — with end-to-end encrypted backup when you switch phones.
Australia
Easily secure all your passwords, credit cards, addresses, and sensitive information across the web and on any device with Avast Password Manager mobile app*.
Czechia