
Onyx: Fitness & AI Coach
Workout, Recovery, Sleep Score
About
This app acts as a personalized AI fitness coach, analyzing your wearable data to provide tailored advice on training, nutrition, and rest. It offers detailed recovery scores, sleep analysis, and illness early warnings based on your unique metrics.
What's New in Onyx
2.8
July 16, 2026
Onyx 2.8 is our biggest update yet. Onyx now doesn't just track your health, it acts on it. Recovery Mode When your signals say you're getting run down, Onyx proposes a plan that eases your whole week: softer training, steady calories, more protein, and your streak protected. It lifts the plan on its own once you're back to baseline. Nothing changes until you tap Apply. Your labs, put to work Flagged bloodwork now turns into action. High LDL nudges your fiber target up, low iron eases your training, and every suggestion is a one-tap card with a plain-English why. A heads-up, not a diagnosis. Pro. Future You See where you're headed. Onyx projects your bodyweight and your key lifts weeks ahead from your own trend, with an honest confidence band. Pro. Your Triggers Tap how you feel each day. Over time Onyx connects it to your sleep and recovery and surfaces your personal patterns. Your runs, beautifully mapped Cardio and workout summaries got a full redesign: an immersive route map, your distance and pace up front, splits, and heart-rate zones painted onto the trail. Tap for full screen, then share your route. Widgets for every glance New Home Screen and Lock Screen widgets in every size: calories and macros left, a Today overview, plus roomier Recovery and streak widgets. A smarter Apple Watch app Your wrist now shows today at a glance even between workouts. Start a workout without your phone, and add Onyx complications to your watch face. Plus dozens of fixes and refinements throughout.
MoreSubscription plans
Onyx Pro Yearly
Unlimited AI Coach, smart food log, every Pro feature.
In-App Purchases
$79.99
Onyx Pro Lifetime
Pay once, get forever — every Pro feature we add later.
FAQ
What data does Onyx use to provide coaching?
Onyx reads data from your Apple Watch and other connected wearables via Apple Health, including workout history, sleep patterns, heart rate variability (HRV), resting heart rate, and wrist temperature to offer personalized insights.
How does Onyx score recovery and sleep?
Onyx calculates a recovery score from 0-100 based on HRV, resting heart rate, sleep, and wrist temperature, comparing it to your personal baseline. Sleep is also scored from 0-100, broken down by duration, deep/REM stages, efficiency, and consistency.
Can Onyx help with illness detection?
Yes, Onyx can provide early illness warnings by detecting combined signals like drops in HRV, climbing RHR, and drifting wrist temperature, alerting you before symptoms become apparent.
What are the features of Onyx Pro?
Onyx Pro offers unlimited coaching messages, workout scoring, a smart AI food log, and detailed illness analysis, in addition to the features available in the free version.
What is the pricing for Onyx Pro?
Onyx Pro is available for $4.99 per month, $39.99 per year with a 7-day free trial, or a lifetime purchase of $79.99.
Does Onyx have ads?
No, Onyx does not have advertisements. The app is free to use with core features, with an optional paid upgrade for advanced functionalities.
What devices and platforms does Onyx support?
Onyx requires an iPhone running iOS 18 or later and connects with Apple Health. It is compatible with Apple Watch and most third-party wearables like Whoop, Oura, Garmin, and Fitbit.
How often is Onyx updated?
The latest version of Onyx is 2.3, and it was last updated on May 27, 2026. This indicates a relatively active development cycle.







