What are the best authentication methods for modern apps?

Multi-Factor Authentication (MFA) methods must balance security, accessibility, and user experience (UX) to effectively protect data and ensure legal compliance. Passkeys with biometric authentication are considered among the safest due to their resistance to phishing and their passwordless, convenient nature. When evaluating MFA methods, it is crucial to consider potential scenarios where user credentials or devices could be lost, stolen, or compromised, while also addressing issues like authentication fatigue and recovery processes. Security should be prioritized slightly more than accessibility and UX, as the consequences of security breaches can be more severe, though all three aspects are essential for ethical and legal reasons. Compliance with security frameworks such as NIST SP 800-63, PCI DSS 4.0, and ISO/IEC 27001 is recommended, alongside adherence to Web Content Accessibility Guidelines (WCAG 2.2) for accessibility. Good security practices can enhance UX by clearly communicating their benefits and potential risks, while inclusive design principles improve accessibility for all users.