[Industry First] Beatfit Launches AI Trainer Feature 'Fitty'

Aristol Co., Ltd. (Headquarters: Shibuya-ku, Tokyo; Representative Director: Manabu Miyazaki; hereinafter 'the Company') released 'Fitty,' a new feature that allows users to converse with an AI, on the personal healthcare app 'Beatfit' on April 1, 2026. This feature is the industry's first unique AI system that integrates the behavioral change data the company has accumulated over many years into existing large language models using RAG (*1). Unlike conventional AI that only 'answers questions,' this system realizes proposal-based communication where the AI actively reaches out. Moving forward, the company will apply the knowledge gained from this development to areas outside of healthcare to support corporate problem-solving.

*1: A technology that allows large language models like ChatGPT to refer to external information such as internal documents and databases when generating answers. It enables the suppression of hallucinations and high-precision output specialized in professional fields.

*2: Based on company research (as of February 2026). Among the 28 major apps providing healthcare services for domestic corporations, this is the industry's first AI chat feature that utilizes RAG technology and actively sends messages based on user attributes and behavioral data.

[Development Background]
In recent years, AI technology has made rapid progress, and the company has been capturing this trend and conducting research and verification from an early stage. Recently, as seen in the emergence of OpenAI's 'ChatGPT Health' (*3), AI is evolving from a mere efficiency tool into a 'life infrastructure' that supports people. Based on this social trend, the company decided to implement a mechanism utilizing AI technology within its product, Beatfit.

[Details of the New Feature]
The system developed this time is implemented in Beatfit as the AI trainer 'Fitty.' The main features are as follows:

1. AI equipped with proprietary data via RAG
While general AI functions create answers using 'broad knowledge on the internet' as the main source, this feature adopts a mechanism (RAG) that answers while reading the proprietary data cultivated by Beatfit over many years. This enables highly effective answers that maximize the use of the company's strength: 'habituation of exercise.'

2. AI that proactively reaches out to users
Unlike conventional 'instruction-waiting' AI, Fitty sends chats on its own to call out to users. By analyzing variables such as the user's app launch frequency and exercise time, it supports health behaviors as a slightly meddlesome partner.

3. AI that gets closer to users the more it is used
Fitty learns the user's personality and lifestyle as they converse and work on self-care together. By designing it to be an existence that users can feel attached to, like a pet, rather than just a chat tool, it prevents churn due to loss of motivation and provides an environment where users can continue healthy habits while having fun.

[Future Outlook]
Through the development and operation of this system, the company has accumulated various insights in service development utilizing generative AI. The company believes that this development know-how can be applied to areas other than healthcare. The company will provide its technology and know-how to companies that have requests such as 'wanting to develop services by linking proprietary data with AI' or 'exploring new possibilities by combining existing products with AI.' Please feel free to contact us as a partner for generative AI utilization.