Braze Content Cards offer a turnkey solution for in-app messaging by integrating a single JavaScript snippet into an app to render iframe-based content, but they often cause issues like content security policy conflicts, increased page load times, and limited customization. As the web has evolved, modern frameworks like React emphasize native components and performance efficiency, leading to a shift away from iframe-based solutions. Alternatives such as Knock, Pendo, Appcues, Chameleon, Customer.io, and Frigade provide various approaches to in-app messaging, each with unique features like real-time delivery, multi-channel orchestration, and native component use. These alternatives cater to different needs, from engineering teams requiring full UI control to marketing teams seeking basic in-app messaging integration. The decision on which platform to use should consider the level of control needed, the functionality provided, and the impact on network performance.