The best alternatives to 0xPass are Sign-in with Web3 ID, Instant 2FA, and Bulwark. If these 3 options don't work for you, we've listed a few more alternatives below.
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Snowflake O'Reilly Report— Design a Modern Application Data Stack
Web3 ID is a blockchain-based auth system that lets you verify private personal data from your users' ID Wallets. Always with the users' consent and secured by cryptography. Enable passwordless login, prevent user tracking, and avoid data collection.
Authenticator generates two-factor authentication (2FA) codes in your browser. Use it to add an extra layer of security to your online accounts. Supports TOTP HOTP Authenticator Extension serves as a drop-in replacement for apps such as Google Authenticator.