How Origin Path works

The Fertility Readiness Index (FRI) turns your daily health data into a single score (0–100). Here's exactly how it's calculated and where the data comes from.

The Fertility Readiness Index

Sperm take roughly 74 days to develop (spermatogenesis). The habits you build today determine the quality of the cohort that will be available in about three months. FRI measures how consistently you're hitting the daily targets that research links to optimal sperm parameters — count, morphology, motility, and DNA fragmentation.

Each of 8 health domains is rated Green, Yellow, or Red against phase-specific targets. The domain scores are weighted and combined into a single daily number.

What the colors mean

🟢 Green — on target → 90 pts 🟡 Yellow — close → 70 pts 🔴 Red — off target → 40 pts ⚪ No data → 50 pts

A day with all 8 domains green scores 90. A day with no data logged scores 50 (neutral). Missing a week drops your FRI noticeably — the model assumes the worst for each unlogged day.

The formula

FRI = weighted sum of domain scores

Each domain contributes its points × its weight. For example, a green sleep day (90 pts) with a 20% weight contributes 18 to the total. A red training day (40 pts × 15%) contributes 6. Sum all eight and you get today's FRI.

The 8 domains

😴

Sleep

Total hours per night against a 7–9 hr target. Short sleep elevates cortisol and suppresses testosterone.

Weight: 20%

Source: Apple Health (sleep analysis) or manual entry

🏃

Training

Weekly Zone-2 cardio minutes and strength sessions. Moderate aerobic exercise is associated with higher sperm count and motility.

Weight: 15%

Source: Apple Health (workouts) or manual entry

🥗

Nutrition

Daily diet quality rating (1–5) and key nutrient days — omega-3, zinc, folate, antioxidant-rich meals logged each week.

Weight: 15%

Source: Manual entry (5-second quality rating)

💧

Hydration

Daily water intake in litres. Semen volume and sperm motility are sensitive to hydration status.

Weight: 10%

Source: Manual entry

💊

Supplements

Adherence to your personalized supplement stack (CoQ10, zinc, selenium, vitamin D, etc.) defined in your plan.

Weight: 10%

Source: Manual entry (checkbox per supplement)

🌡️

Heat & Environment

Sauna, hot tub, and laptop heat exposure logged daily. Scrotal temperature above ~35°C measurably reduces sperm production.

Weight: 10%

Source: Manual entry

🧘

Stress

Daily stress rating (1–5) and minutes of stress-management practice (meditation, breathwork). Chronic stress elevates cortisol.

Weight: 10%

Source: Manual entry; HRV from Apple Health as context

🍷

Alcohol

Units per day. Even moderate alcohol intake is associated with reduced testosterone and morphology.

Weight: 5%

Source: Apple Health (iOS 26) or manual entry

Data sources

Origin Path pulls from two sources: Apple Health (automated, requires your permission) and manual entry in the Daily Log. Every field shows a badge so you always know where the number came from.

Data type	Source	Can be disabled?
Sleep hours & timing	Apple Health → sleep analysis	Yes — toggle in Health Settings
Resting heart rate	Apple Health → resting HR	Yes
HRV (SDNN)	Apple Health → HRV	Yes
Step count	Apple Health → steps	Yes
Workouts (type, duration)	Apple Health → workouts	Yes
Alcoholic beverages	Apple Health (iOS 26+) → dietary data	Yes
Nutrition quality, hydration, stress, heat, supplements	Manual entry in Daily Log	N/A — always manual
Body composition, semen analysis	Manual entry at phase checkpoints	N/A — always manual

Origin Path never writes to Apple Health. See the full privacy policy for details on how all data is stored in your personal iCloud account.

Phases and checkpoints

Your plan is structured into phases — typically Ramp, Optimize, TTC Sprint, and TTC Window — each with specific targets calibrated to where you are in the preconception timeline. Phase targets are more aggressive as you approach the TTC window.

At defined checkpoints (roughly every 10–12 weeks), you record a semen analysis, key labs, and body composition. The pipeline recalibrates targets based on your results. Semen analysis takes 74+ days to reflect habit changes — checkpoints are timed to catch meaningful signal.