More ways to move.
Track outdoor routes with GPS, or record an indoor session. Review duration, distance, pace, elevation, and average heart rate when available from your recording device or connected health data.
Energy intelligence
Your body is a dataset StatsKey makes legible.
Record meals, plan your training, track strength and activity, and connect your health history. Bring it together with Intelligence and insights you can review.
The core app is free. Pro (US$49/month in the United States; US$19.99/month elsewhere) is the optional subscription on the web, with the full Pro feature set and 2 million included Intelligence credits each month. Data Agent and manually selected frontier models remain separately metered. Existing web subscribers retain their agreed prices and renewal terms, including annual plans. US web Pro: US$49/month. Current US App Store Pro: US$50/month. Web subscriptions outside the US cost US$19.99/month. The web and latest iPhone app offer one monthly Pro plan for new purchases. Plans and prices vary by country and app version. Confirm the price and billing period shown at checkout before purchase. Existing subscribers may have different renewal prices; check subscription settings. Other regions and existing plans may differ; confirm the price before purchase.
103nutrient model
8nutrient categories
USDAFoodData Central
Intelligencegrounded in your records
iOS+ Apple Watch
6mobile app languages
Why StatsKey
Easy to record. Clear enough to review.
Capture a meal, review its ingredients and serving, and inspect the available nutrition evidence. StatsKey keeps nutrient coverage, source information, and estimates visible alongside the rest of your day.
Search → review → Nutrition Facts and source details. Actual screen recording.
Capture
A record you can edit
Food text, photos, and labels
Ingredients and serving amounts
Saved foods and meals
Water and daily totals
Review
The evidence behind available values
Nutrient coverage and source details
Measured and estimated values
Values outside your target range
Unknowns kept visible
Connect
Your day in context
Meals, workouts, and recovery
Glucose and wellness history
Intelligence with your records
Plans and reports you can review
Coverage depends on the food, source, and information supplied. A nutrient estimate is not a measurement, and a target-range flag is not a diagnosis.
Adaptive Intelligence. Plans that keep themselves honest.
Set a goal and StatsKey maintains the math: a formula ensemble tuned to your body, thirty days of Apple Watch activity, and your gap-aware weight trend, reconciled into one maintenance number and carried into weekly planning. When measured reality disagrees with the formula, reality wins — in proportion to the evidence.
Intelligence supports planning and optimization across all activities. Suggestions may be incomplete or inaccurate; review and adapt them to your needs before applying them. It is not medical advice.
Recent evidence → weekly plan → race outlook. Actual screen recording.
Formula ensemble
Katch-McArdle · Ten Haaf · Mifflin
Apple Watch
30-day activity · TEF from your macros
Weight trend
gap-aware smoothing · outlier-safe
Maintenance, reconciled
2,872kcal
weight trend pulled +25 kcal
High confidence — informed by your weight trend
Activity recording
Your training, in the details.
Runs, rides, swims, walks, lifting, and more belong in one activity history. Record the session, keep the details that matter, and see how your work adds up over time.
Every completed set counts.
Build a routine, record the weight and reps you complete, and follow set and rest timers. Weighted, bodyweight, and timed exercises sit alongside your other activities, with lifting history you can review.
Built for interruptions.
On iPhone and Apple Watch, workouts are saved on your device and syncing is retried after connection interruptions. Resume a saved lifting session and check its sync status in the app.
A record you can return to.
Review your activity across weeks, months, and years. Add a past workout, correct its details, and explore the metrics you recorded, including completed sets and lifting volume.
Available metrics depend on the activity, device, permissions, and recording source. Features vary by platform and app version.
Outside the expected range
See what’s outside your target. Trace the evidence.
StatsKey flags micronutrients outside your target range — low or high — then shows the evidence behind each value: confidence, food-level sources, and whether it was measured or estimated. A bison-and-rice nutrient label and its tryptophan sourcing show the whole chain without treating an estimate like a diagnosis.
Bison and rice Nutrition Facts → tryptophan source evidence. Actual screen recording.
The hardest signal to talk about
The gut: huge, multifactorial, and mostly invisible.
Around 40% of people have a disorder of gut–brain interaction and ~12% have IBS; most name food as a trigger, but every trigger list is individual. In one US study, more than 60% of patients hid bowel-urgency symptoms from their own doctor out of embarrassment.
StatsKey's Gut Check records the whole episode — Bristol type with mixed-episode phases, urgency, control, passage, cleanup, red flags — and scores each one 0–10 for GI burden, right alongside food, fiber, glucose, and training. Gut–brain patterns compute from your own paired days, you can enable an optional record lock using supported device authentication, and Intelligence can trace any rough afternoon back to the meals before it. No one has to say a word.
NIDDK (IBS ~12%) · Rome IV DGBI epidemiology (Sperber 2021; Palsson 2020) · Lilly CONFIDE (bowel-urgency underreporting).
Choose Bristol form and mixed phases in seconds. Actual screen recording.
Research concepts
Researching what's to come.
Explore live previews of design studies, documented concepts, and early research programs — not commercial products or clinically validated devices. Each page makes the proposed architecture, evidence boundary, and validation work still required explicit.
THE OLYMPIC MARATHON EXPERIMENT
Can I run an Olympic marathon?
One runner. A big question. The entire journey.
I’m building StatsKey while training to find out how far I can go. Follow the miles, the meals, the recovery, and the plan as it unfolds.
Runs and gym sessions since August 2025, with nutrition alongside them. Explore the record below.
Explore the full record
My full health record alongside the Olympic marathon experiment: running, nutrition, medications, sleep, and biometrics. Updated automatically as new data syncs.
Founder record
Connecting…
The work behind the goal.
Explore the training and nutrition behind the experiment. Sign in to follow the connected record.
Activity · Running + strengthConnecting…
Nutrition · Live insights + historical profileConnecting…
Longitudinal running record and recent activity
Routes stay private by default. A map is requested only after I publish that individual workout from StatsKey, with privacy zones applied.
Start measuring what matters
Build the model your body has been asking for.
Start free today. Pro (US$49/month in the United States; US$19.99/month elsewhere) is the optional subscription on the web, with the full Pro feature set and 2 million included Intelligence credits each month. Data Agent and manually selected frontier models remain separately metered. Existing web subscribers retain their agreed prices and renewal terms, including annual plans. US web Pro: US$49/month. Current US App Store Pro: US$50/month. Web subscriptions outside the US cost US$19.99/month. The web and latest iPhone app offer one monthly Pro plan for new purchases. Plans and prices vary by country and app version. Confirm the price and billing period shown at checkout before purchase. Existing subscribers may have different renewal prices; check subscription settings. Other regions and existing plans may differ; confirm the price before purchase.
The mobile app supports English, Spanish, German, Hindi, Japanese, and Brazilian Portuguese. Features vary by platform, app version, and plan.