Sungjin Kim

Sungjin Kim

Founder & CEO at 6Letters

Badges

Tastemaker
Tastemaker
Gone streaking
Gone streaking

Maker History

  • MOJO KING
    MOJO KINGYour Apple Watch can now estimate your testosterone. Daily.
    Mar 2026
  • 🎉
    Joined Product HuntMarch 23rd, 2026

Forums

3mo ago

MOJO KING - Your Apple Watch can now estimate your testosterone. Daily.

Most men check their testosterone once a year — at best. But T levels fluctuate 30–50% throughout the day and are one of the earliest signals of energy, mood, and metabolic health. MOJO KING estimates your testosterone daily using your Apple Watch's PPG sensor and HRV patterns. No blood draw. No clinic visit. 15 seconds on your wrist.
View more