Mobile apps have become an integral part of daily life, and their development is driven by the need for rapidly evolving mobile app development tools. SDKs play a crucial role in this process, as they provide a way to integrate third-party functionality into apps. According to developers from Instabug, an iOS team member notes that SDK development differs from app development due to the lack of first-class support from Apple and the need to implement features manually or find workarounds. In contrast, developing an Android SDK is more challenging due to the platform's fragmentation and the need to support a wide range of devices and environments. Developers emphasize the importance of understanding how SDKs and libraries work from the inside, adopting a different mindset and approach to development, and being detail-oriented when working on SDKs. Additionally, they highlight the benefits of open-sourcing SDKs and creating demo apps to showcase their capabilities. Overall, SDK development requires a unique set of skills and challenges that differ from app development.