[Industry First] Beatfit Launches AI Trainer Function "Fitty"

Aristol Inc. (Headquarters: Shibuya-ku, Tokyo; Representative Director: Manabu Miyazaki; hereinafter "the Company") released "Fitty," a new AI-powered conversational feature, on April 1, 2026 (Wednesday) within its personal healthcare app "Beatfit." This feature is an industry-first (*2) proprietary AI system that integrates behavioral change data accumulated by the Company over many years into existing large language models using RAG (*1). Unlike conventional AI that merely answers questions, Fitty enables proactive, proposal-based communication from the AI side. Moving forward, the Company plans to expand the knowledge gained from this development into areas beyond healthcare, supporting companies in solving their challenges.

*1: A technology that allows large language models like ChatGPT to refer to external information such as internal documents and databases when generating responses. This suppresses hallucinations and enables highly accurate output specialized in specific domains.

*2: According to the Company's own research (as of February 2026). In a feature survey targeting 28 major apps providing healthcare services for corporations in Japan, this is the industry's first AI chat function that utilizes RAG technology and proactively sends messages from the AI side based on user attributes and behavioral data.

Background of Development

In recent years, AI technology has undergone rapid development, and the Company has recognized this trend early on, conducting extensive research and verification. As seen with the recent emergence of OpenAI's "ChatGPT Health" (*3), AI is evolving from a mere efficiency tool into a "life infrastructure" that supports people. In light of these societal trends, we decided to implement an AI-powered mechanism within our proprietary product, Beatfit.

*3: Source: Introducing OpenAI for Healthcare

Details of the New Feature

The system developed this time has been implemented in Beatfit as the AI trainer "Fitty." Its main features are the following three points:

1. AI equipped with proprietary data via RAG

While general AI functions generate responses primarily from "broad knowledge on the internet," this feature adopts a mechanism (RAG) that generates responses by reading Beatfit's proprietary data accumulated over many years. This enables highly effective responses that maximize the use of our company's strength: data related to "habitual exercise."

Examples of in-app usage:

• Proposing optimal health behaviors based on past success data in response to user consultations like "I'm tired from work and lack motivation..."

• Providing precise follow-ups such as "You're just 5 minutes of strength training away from your goal today" based on user goals and meal records.

2. AI that proactively engages with users

Unlike conventional "wait-and-see AI," Fitty proactively sends chats to engage with users. By analyzing variables such as user app launch frequency and exercise duration, it acts as a slightly meddlesome partner, encouraging healthy behaviors.

Examples of in-app usage:

• Creating opportunities for action through chat prompts at the end of work or during idle moments when users might procrastinate.

• Detecting when exercise might be interrupted and proposing menus tailored to past preferences to prevent dropout.

3. AI that becomes more attuned to users the more it's used

The more Fitty engages in conversations and encourages self-care with users, the more it learns about their personality and lifestyle. Designed not just as a chat tool but as an endearing presence like a pet, it aims to prevent user dropout due to decreased motivation and provide an environment where healthy habits can be continued enjoyably.

Future Outlook

Through the development and operation of this system, the Company has accumulated various insights into service development utilizing generative AI. We believe that the know-how gained from this development can be applied to areas beyond healthcare.

We will offer our technology and expertise to companies that wish to "develop services by linking their proprietary data with AI" or "explore new possibilities by combining existing products with AI." Please feel free to contact us as a partner for generative AI utilization. Inquiries can be made here.

What is Beatfit for Biz?

"Beatfit for Biz" is a health management solution that helps employees overcome lack of exercise and improve mental health. Our original fitness content is designed based on behavioral economics with the goal of "making exercise a habit," providing an optimal solution for companies aiming for specific health guidance measures and White 500 certification. To date, it has been introduced by many companies across various industries, including pharmaceutical companies, trading companies, and securities firms.

Examples of companies that have introduced our service:

• JERA Inc. https://prtimes.jp/main/html/rd/p/000000087.000032515.html

• YG Health Insurance Association https://prtimes.jp/main/html/rd/p/000000048.000032515.html

• NTT Docomo, Inc. https://prtimes.jp/main/html/rd/p/000000047.000032515.html

• Daiwa Securities Group Inc. https://prtimes.jp/main/html/rd/p/000000041.000032515.html

For more details on the service, please download the materials here.

About Aristol Inc.

With the purpose of "Changing consciousness, changing behavior, changing the future," we aim to be a group that elucidates human behavior most thoroughly in the world, based on data science and behavioral science, and "solves problems through behavioral change." We support the sustainable growth of companies through both our healthcare business and our DX consulting business, which deploys the know-how cultivated there.

Company Profile

Name: Aristol Inc.

Location: BLOCKS Ebisu 501, 1-11-2 Hiroo, Shibuya-ku, Tokyo

Establishment Date: January 9, 2018

Representative: Manabu Miyazaki, Representative Director & CEO

URL: https://aristol.jp/

Inquiries regarding this release

Aristol Inc. Public Relations E-Mail: contact@aristol.jp