On October 30, 2025, Google announced the Alpha release of the ML Kit GenAI Prompt API, a significant development for Android's on-device generative AI capabilities. This API allows developers to send natural language and multimodal requests to Gemini Nano, offering greater control and flexibility for creating personalized app experiences. The API supports custom, app-specific use cases, moving beyond pre-built functionalities. Key partners like Kakao are already leveraging the Prompt API to develop unique applications with real-world impact. The Prompt API enables various use cases, such as classifying images, intelligent document scanning, and transforming long-form content into concise notifications. For example, it can analyze photos to generate social media tags or extract important details from emails. Developers can create custom prompts and set generation parameters easily with minimal coding. The API performs best on Pixel 10 devices, which run the latest version of Gemini Nano. However, developers without access to these devices can still prototype features using the Gemma 3n model. For those interested in implementing the Prompt API, Google provides official documentation and sample code on GitHub. This resource can help developers get started with their applications and explore the API's potential. The focus on local processing enhances user privacy and enables offline capabilities, making it a practical tool for developers aiming to innovate in the mobile app space.