Passwords are a significant security weakness, but passkeys offer a user-friendly, phishing-resistant, and secure alternative. The Android Credential Manager API facilitates the transition to passkeys while retaining support for traditional sign-in methods. Passkeys are cryptographic credentials linked to device unlocking mechanisms, enhancing user experience through faster and more secure sign-ins. Benefits include a unified sign-in UI, reduced login times, improved security against data breaches, and cross-device compatibility. Notable apps like X, KAYAK, and Zoho have seen significant improvements in login rates and speed after adopting passkeys.Developers can leverage the Credential Manager API for passkeys, passwords, and federated sign-in, simplifying authentication flows. Passkey prompts are recommended during user registration, sign-in, account recovery, and password resets. Encouraging adoption requires a clear value proposition highlighting security, convenience, and cross-platform consistency. A seamless user experience, including a unified UI and fallback options, is crucial. Educating users and implementing a progressive rollout can further enhance adoption.Uber strategically promotes passkeys in account settings and other key moments, driving high adoption without disrupting core user journeys. Economic Times refined their passkey prompts, removing them from sensitive checkout flows to improve conversion rates and focusing on sign-in and account management sections. Integrating passkeys with Credential Manager builds trust, enhances security, and future-proofs authentication strategies. Following UX guidelines and the provided documentation is essential for an optimized and seamless passkey implementation.