Onyx: Fitness & AI Coach

Your wearable already knows you're getting sick. Onyx reads the signs a day early and coaches your training, recovery, sleep, and food around it.

Onyx notices you're getting sick before you do. The night before symptoms hit, your heart rate creeps up, your HRV drops, and your skin temperature drifts. Onyx reads those signals from the watch you already own and tells you to ease up before it catches you.

That early warning sits inside a complete training partner: an AI coach grounded in your actual numbers, a recovery score built on your personal baseline, a smart food log, and training that adapts to how you slept. Free to start.

IT NOTICES BEFORE YOU FEEL IT When your HRV, resting heart rate, and wrist temperature drift off baseline together, Onyx flags it on your Lock Screen and shows you exactly which signals moved. An early heads-up, not a diagnosis. Taper, hydrate, get to bed early, and you may dodge the worst of it.

A COACH THAT KNOWS YOUR DATA Coach knows your last bench press, your last meal, and last night's sleep. Ask "should I train today?" and the answer cites your numbers. Then put it to work: Coach builds workouts, plans a full week of meals, designs multi-week programs, and recalculates your calorie targets. Every change arrives as a card you approve with one tap. Nothing happens until you say so.

RECOVERY, EVERY MORNING Onyx turns your HRV, resting heart rate, sleep, and wrist temperature into one score, measured against your own baseline instead of generic age zones. Green means push. Red means the gym will still be there tomorrow.

AT A GLANCE Put your recovery score and illness watch on your Lock Screen, Home Screen, and Apple Watch face. One look tells you if it's a push day, no app needed.

TRAINING BLOCKS THAT ADAPT (PRO) Start a 4 to 8 week block and Onyx periodizes it: volume builds, peaks, then deloads. Every morning it re-reads your recovery before writing the day. Rough night? Your heavy session moves, and Onyx shows you why. No other training app reads your body before it writes your workout.

YOUR WORKOUT, EVERYWHERE Log sets and run rest timers from the Lock Screen and Dynamic Island without unlocking your phone. Minimize a session into a pill and check your macros mid workout. No Apple Watch? Live tracking runs right on your iPhone.

EVERY WORKOUT, GRADED (PRO) Each session earns a grade from S to D, tied to your goal and your recovery state, with receipts attached: "+2 PRs," "volume 18% above your 4-week average," "heavy session on a 47% recovery day."

CARDIO LOAD Every run, ride, and walk gets a route colored by effort, time in each heart rate zone, and a Cardio Load score. The strain metric other platforms charge $30 a month for is built in.

SLEEP, SCORED A 0 to 100 score for last night across duration, deep and REM stages, efficiency, and consistency, so you know what dragged the number down, plus how long it took to fall asleep.

SMART FOOD LOG + WEEKLY MEAL PLANNER Snap a photo of your plate or describe it in a sentence, and the macros log themselves. Scan barcodes to flag additives like Red 40. Coach plans seven days of recipes around your targets and training days, and one tap logs the meal you cooked.

BRING YOUR LABS (PRO) Snap your bloodwork or import the PDF. Onyx extracts every marker with its reference range, flags what's off, charts it over time, and gives you a plain-English read on what moved, folded into Coach's picture of you. Other platforms charge hundreds a year for labs. Yours are sitting in a patient portal.

WORKS WITH WHAT YOU WEAR Onyx reads Apple Health, so it works with Apple Watch, Oura, Garmin, Whoop, or Fitbit. No proprietary strap. No new ecosystem to buy into.

YOURS, PRIVATELY Your data lives on your phone and in your private iCloud. Daily insights generate on-device. Export everything as CSV whenever you want, and deleting your account actually deletes it.

Free to start. Onyx Pro is $39.99 a year.

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