TL;DR: Building login and multi-factor authentication (MFA) for custom apps can be challenging, time-consuming, and risky. This post provides the top tutorials and SDKs that can be used to quickly leverage login and MFA provided by Okta. Your developers can streamline development and focus on building the best user experience, while you control the application identities and access management—all from a single location. Building authentication: challenging, time-consuming, and risky If you’re developing an app with a private area, you need authentication. But the moment a login is introduced, security and privacy concerns come into play. Securing your app with a single password is simply not good enough—81% of data breaches are caused by weak or hacked credentials. To prevent the reputational harm and financial loss a data breach could have on your organization, it’s crucial to bolster security through multi-factor authentication (MFA). In some instances, your application.