Core Insights - Digital healthcare startup 6Letters has launched MOJO KING, an iOS application for non-invasive testosterone monitoring using Apple Watch data [1][2] - The app analyzes heart rate variability (HRV) to track male hormonal balance without the need for blood tests or external sensors [2] - MOJO KING categorizes users based on their biometric signals compared to age-group baselines, presenting results in a user-friendly format [2] Product Features - Users can opt for a paid subscription to remove ads and enable continuous measurements for personalized hormone monitoring [3] - The app is built on multiple patents and peer-reviewed research, with ongoing machine-learning model training using large-scale medical datasets [4] - MOJO KING offers insights into hormone responses to strength training, differentiating it from conventional fitness apps [5] Future Plans - 6Letters plans to expand MOJO KING with features for hormone-dependent hair loss management and is developing MOJO QUEEN for female hormone analytics [6] - The company is conducting a pre-seed funding round with an estimated valuation of USD 5 billion and aims for FDA 510(k) clearance in 2026 [7] - 6Letters intends to enter the U.S. Remote Patient Monitoring reimbursement market following AI training completion [7][8]