Which Hyperledger framework focuses on including mobile application development in its key features?

Hyperledger Iroha is designed with a focus on simplicity and ease of use, particularly for mobile application development, making it an excellent choice for developers looking to integrate blockchain into mobile-friendly solutions. It features a user-friendly architecture and provides a set of APIs that facilitate the creation of applications tailored for mobile devices.

The emphasis on mobile application development is crucial because it targets use cases where lightweight blockchain solutions can be deployed effectively in mobile environments. Hyperledger Iroha allows developers to implement blockchain applications easily on smartphones and tablets, which is increasingly relevant in today's mobile-centric world.

In contrast, other frameworks like Hyperledger Fabric, Hyperledger Sawtooth, and Hyperledger Indy have different primary objectives and use cases focused on enterprise-level operations, distributed ledger technology for IoT, and identity management, respectively. These frameworks do not specifically target mobile application development as a key feature, limiting their direct applicability to mobile platforms compared to Hyperledger Iroha.