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6Letters Launches "MOJO KING," an Apple Watch-Based iOS App for Non-Invasive Testosterone Monitoring

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SEOUL, South Korea, Jan. 19, 2026 /PRNewswire/ -- Digital healthcare startup 6Letters today announce...

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AI Summary

6Letters has launched MOJO KING, an iOS app that enables Apple Watch users to non-invasively monitor testosterone levels through heart rate variability. By enhancing the health monitoring capabilities of Apple devices, this app could significantly contribute to Apple's ecosystem and appeal to health-conscious consumers.

Sentiment Rationale

Similar trends in health application uptake have previously led to enhanced user engagement and sales in the technology sector, particularly for Apple in health and wearables, indicating positive price movement.

Trading Thesis

AAPL could see bullish momentum driven by increased health app adoption, particularly in wearable tech.

Market-Moving

  • Growing demand for health applications can enhance Apple's market presence and sales.
  • Potential FDA clearance in 2026 may boost device adoptions within healthcare.
  • Further integration of MOJO KING into Apple products could elevate their value.
  • Competitive differentiation in health tech might positively impact Apple's user base.

Key Facts

  • 6Letters launched MOJO KING, enhancing health monitoring using Apple Watch.
  • The app tracks testosterone levels via heart rate variability (HRV) data.
  • Subscriptions allow continuous monitoring and user-friendly hormone analysis.
  • The platform could promote Apple's health ecosystem with advanced applications.
  • Expansion plans include additional features and new female-focused app.

Companies Mentioned

  • Apple Inc. (AAPL): Increased app capabilities may drive hardware sales.
  • 6Letters (N/A): Startup developing innovations that enhance health functionality on Apple devices.

Corporate Developments

This news fits into the 'Corporate Developments' category because it showcases a significant innovation in health technology that utilizes Apple’s existing product ecosystem, potentially expanding its market share and user engagement in the health sector.

6Letters Launches “MOJO KING”: A Revolutionary iOS App for Non-Invasive Testosterone Monitoring

Digital healthcare startup 6Letters has officially launched MOJO KING, an innovative iOS application designed to enable non-invasive monitoring of testosterone-related physiological patterns using Apple Watch data. This groundbreaking app utilizes heart rate variability (HRV)—a standard biometric signal collected by Apple Watch—to analyze changes related to male hormonal balance. By eliminating the need for blood tests or external sensors, MOJO KING allows users to effortlessly track hormone-related trends in their daily lives.

Key Features and Functionalities of MOJO KING

The current version of MOJO KING offers a comprehensive analysis of individual biometric signals in relation to age-group baselines and 24-hour circadian rhythms. Based on the app's analysis, users are intuitively classified into two categories:

  • Teto Guy: When hormone levels are above the age-adjusted average.
  • Egen Guy: When hormone levels fall below the average.

Results are displayed in a user-friendly visual format, making it easy for users to share insights through social media platforms such as Instagram.

Subscription Model and Advanced Monitoring

MOJO KING offers a paid subscription option that removes in-app advertisements and enables automatic, continuous measurements. This feature empowers users to observe personalized hormone-related changes over time, transforming one-time readings into longitudinal, trend-based hormone monitoring tailored to individual lifestyles.

Technology and Innovation Behind MOJO KING

Developed on a foundation of multiple patents and peer-reviewed scientific research, MOJO KING is currently enhancing its accuracy and personalization capabilities through machine-learning models trained with large-scale medical datasets from organizations like the UK Biobank, CDC, and Physionet. These insights will ultimately fuel the next generation of 6Letters' hormone analytics platform.

Unlike traditional smartwatch applications, which primarily focus on heart rate and respiration during aerobic activities, MOJO KING analyzes pre- and post-exercise changes associated with moderate-to-high-intensity resistance training. This unique approach provides valuable insights into hormone-related responses following strength training.

Future Developments and Market Strategy

Looking ahead, 6Letters plans to expand MOJO KING with additional modes, including features for hormone-dependent hair loss management and growth-phase optimization. The company is also preparing to introduce MOJO QUEEN, a complementary application focused on female hormone analytics.

As part of its growth strategy, 6Letters is currently conducting a pre-seed funding round with an approximate valuation of USD 5 billion. The company anticipates completing AI training based on extensive medical data and aims to apply for FDA 510(k) clearance in the first half of 2026, paving the way for entry into the U.S. Remote Patient Monitoring (RPM) reimbursement market.

Conclusion: Empowering Users with Hormone Health Insights

"MOJO KING is designed to help users understand and manage hormone-related physiological signals in everyday life," said a representative of 6Letters. By merging scientific evidence, large-scale medical data, and wearable technology, 6Letters aims to create a globally scalable digital hormone health platform.

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