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6LETTERS

Why It’s Different

Non-Invasive Continuous Monitoring

By integrating continuous biometric signals with clinical data,
we estimate and calibrate individual hormone status in real time.

We design AI systems that are medically interpretable - not merely statistical predictors.

Medical Data-Driven AI

  • Trained on retrospective clinical data from Seoul National University Bundang Hospital
  • Leveraging datasets from the UK Biobank and the U.S. CDC
  • Correlation analysis between clinical biomarkers and biometric signals

Short-term HRV bias correction

Circadian rhythm-aware modeling

Adaptive baseline personalization

Confidence-based output filtering

Data with insufficient reliability is not delivered to users.

Bias-Corrected Hormone Estimation (PCT International Patent Pending) At the core of 6Letters lies a medically reliable correction architecture.

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A 30-Second Innovation
That Redefines Clinical Testing.

Bringing Lab Tests Into Your Hand

From episodic hospital testing to continuous biological intelligence.

Traditional Lab Testing

  • Cost icon

    $350 per blood test

    (U.S. hormone panel average)
    One-time snapshot cost

  • Time icon

    ~4 Hours

    Travel + waiting + blood draw

  • Frequency icon

    1-2 Tests Per Year

    Static snapshot

  • Invasive icon

    Invasive

    Needle-Based Extraction

MOJO KING

  • Cost icon

    $120 per Year

    (Pro Plan)
    Unlimited measurements

  • Speed icon

    15 Seconds

    Instant Wearable Scan

  • Trend icon

    365-Day Hormone Trend

    Captures circadian variation

  • Non-invasive icon

    RPG-Based

    No Needles

90% Cost Reduction

99% Time Reduction

Infinite Data Density

We have built a defensible patent portfolio integrating technology, data, and UX - designed to be difficult to replicate.

  • Patent No. 2025-0072283

    Filing Date : 2025.06.02

    Title : Smartwatch-based personalized testosterone monitoring system and method

    Technical Significance : Smartwatch-based personalized testosterone monitoring system and method

  • Patent No. 2025-0079747

    Filing Date : 2025.06.17

    Title : Testosterone monitoring system and method using multi-wavelength PPG sensors

    Technical Significance : Testosterone monitoring system and method using multi-wavelength PPG sensors

  • Patent No. 2025-0102094

    Filing Date : 2025.07.28

    Title : Engineering-based integrated hormone detection platform and method

    Technical Significance : Platform architecture expandable to multi-hormone monitoring

  • Patent No. 2025-0205101

    Filing Date : 2025.12.19

    Title : Personalized testosterone monitoring and prediction result correction system and method

    Technical Significance : Personalized testosterone monitoring and prediction result correction system and method

  • Patent No. 2025-0208162

    Filing Date : 2025.12.23

    Title : System and method for estimating female hormone status based on wearable biometric signals and providing lifecycle-based user status

    Technical Significance : Female hormone and lifecycle-responsive structural model

  • International Patent (PCT)

    International Application
    No. PCT/KR2026/000284

    Filing Date : 2026.01.06

    Title : Personalized testosterone monitoring and prediction result correction system and method

    Technical Significance : Securing global rights and establishing a foundation for international expansion

Trademarks (2)

Patent No. 402025-0102246 (2025.06.13)

Trademark : MOJO KING

Class/Scope : Male hormone–based service brand

Application No. 402025-0102247 (2025.06.13)

Trademark : 6LETTERS

Class/Scope : Corporate and platform brand