Designed specifically for working out & weightlifting.
Calibrex is all about reps, no steps.
Work out with confidence
Real-time Audio Coaching.
Each workout is fully tailored to you based on your goals, available equipment and previous data points. Your AI trainer will give you spoken instructions in real-time.
Don’t let not knowing what to do stop you from being the best version of yourself. We progress you through movements correctly and efficiently so that you feel strong and confident every step of the way:
Automatic form check-ins and real-time corrections.
Programs and workouts based on your experience and skill level.
Gradual increases that push you, but not too far
Live Longer
Live Longer
Live a Longer, Healthier Life
Our goal is happier, healthier humans. Automatic reassessment of your fitness level puts you on the fast track better long-term health outcomes:
Continuous goal tracking.
Leaderboards within your fitness level and demographic.
Fitness achievements and milestones.
Programs that leverage the latest and greatest in exercise science.
Lift With Confidence
Lift With Confidence
Never Log Your Own Reps, Sets, or Weight Ever Again
No more guessing if you did enough in your session! Using the same technology that pro athletes use, we can make sure every workout you do will bring you closer to your goals:
Real-time weight and speed corrections.
Progressive workout plans with regular check-ins.
Workouts that always leave you feeling accomplished.
Get Progressively Stronger
Get Progressively Stronger
Reach Your Goals in Record Time
Like a real life personal trainer, just tell Calibrex your fitness goals and we’ll make sure you’re tracking towards them:
Workout plans tailored to your goals and experience level.
Automatic progress tracking.
Real-time updates, corrections, and insights.
Every Exercise, Captured.
One wearable tracks everything - gym equipment, bodyweight and free weights.
All users are part of what we build at Calibrex. Get access to the feature request board as soon as you join.
Guided Workouts
On-demand audio workouts. Anytime, anywhere.
Unlike traditional workout apps, Calibrex doesn't script your workout programs. Instead, similar to a real personal trainer, it adjusts every workout in real-time based on your previous data points and your overarching fitness goal.
Live Rep Data Tracking
Never miss a rep.
Stop guessing if you're working hard enough, going deep enough, resting too long, or training incorrectly.
Calibrex measures everything you do in the gym and makes sure you're always improving based on your overarching fitness goal.
Real-time Audio Feedback
Just put your phone in your pocket and lift.
Coach Cali talks to you through your headphones while you train and tells you what to do next, when to start your sets, and what adjustments to make between sets to get the most from your training.
An AI copilot for your workouts that's just as good as a real-life personal trainer.
Calibrex Score
A simple way to check your performance.
Calibrex encapsulates each set down to one Calibrex score based on your rep speed (power output), tempo (your time under tension), and difficulty (how much harder the last rep was than the first).
Know exactly what you need to improve on without having to get a PhD in exercise science.
Lifting Trends
Your fitness at a glance.
Do you know how much you're really working out? With C3 you'll know exactly how much time you spend lifting each week, how many reps you did, how much weight you moved, which muscles were trained (and which weren't).
Are your rest times going up or down? Understand your workout metrics down to the rep so Calibrex can help you optimize your fitness journey.
Auto Rest Tracking With Audio Cues
Always stay on schedule and keep that pump going.
Calibrex knows exactly when you stop moving and tells you when to start again.
Your Calibrex coach learns from your resting patters and takes it into consideration for your Calibrex scores.
No more scrolling when you should be lifting (unless you want to!)
Muscle Split Tracking & Auto Balancing
Always maintain a balanced workout routine.
Calibrex keeps track of how much weight you lift per body part and always recommends new workouts that emphasize your undertrained muscle groups.
No need to plan and strategize, we'll always keep you well-rounded and on-track
Full Workout Data & Summary Review
Every exercise and movement captured and stored.
How did that last session go? What were your reps like two weeks ago?
Review the speed, range, tempo, quality, and difficulty of every set and rep from all of your workouts to get an in-depth picture of how you lift.
Easily share your sets, workouts, and achievements on social with one-click sharing.
Arrive to the gym with a plan, every time.
Elite Coaching, Fraction of the Cost.
This small, easy-to-use magnet keeps track of your workout details—like how many reps you do, how long you rest, how fast you move, and how well you maintain your form.
Your coach will give you real-time audio tips, progress updates, and helpful stats so you can see how you’re improving every step of the way.
Trusted by fitness enthusiasts in 17 countries and trusted by top universities.
Calibrex Beta User Testimonials
Early Adopters Love Calibrex
I didn't think you can do a guided workout class without a trainer. I started laughing the first time I heard it speak out loud but a few reps in I felt like I was in a private workout class.
— Lauren GCalibrex Beta Member
It felt so strange at first that I didn't need to use my phone at between sets. It tracks all my reps, tells me what to do next and counts me down!
— Helen PCalibrex Beta Member
Hardware shipped quickly and set up was easy, don't need anything beyond whats in the box. Gives me great insights into where I'm at and when it's time to lift heavier. I finally put these dusty dumbbells to use lol
— Andrew GCalibrex Beta Member
I went from being shy to doing full blown strength workouts all by myself within 2 weeks!
— Penny ACalibrex Beta Member
Glad to see something for weights in the fitness tracker space this has given me all the data I could reasonably ask for, new features roll out continually, etc. Name another wearable option for lifting at this price point?
— Kyle BCalibrex Beta Member
Planning workouts in my biggest nightmare when it comes to going to the gym. This gives me a new workout, all I have to do is show up.
— Georgia TCalibrex Beta Member
I've been going to the gym for 3 years and for the first time in a while I got stuck in a plateau. Can't rely on the same ol' split every time. Lifting has become more fun now that I have numbers to compare from each session.
— Tyler PCalibrex Beta Member
I'm a calisthenics guy so I mainly use the body clip to track my workouts. Honestly the automatic rep tracking and set countdown are godsent. Exactly what I needed for progressive overload.
— Jacob MCalibrex Beta Member
The First (sometimes) Wearable Designed Specifically for Strength Training.
Calibrex is Designed & Built With 🖤 in New York City.
If you don't find an answer to your question, feel free to reach us via the intercom bubble on the bottom right of your page. Philip or Nick will get back to you super fast :)
Is it beginner-friendly or just for serious lifters?
Both. Whether it’s your first time strength training or you’ve been lifting for years, Calibrex adapts to your experience level and goals. The app’s AI calibrates to your performance and provides tailored recommendations from day one.
Real-time coaching: ✔️ Unlimited workout content ✔️ Real-time audio coaching ✔️ Rep weight, set rest and rep intensity recommendations ✔️ Calorie Burn Data ✔️ 3D form tracking
Analytics: ✔️ Weekly and monthly performance reports ✔️ Post workout analysis & sharable stats ✔️ Compare stats with friends ✔️ Access to Rankings & Teams
Sharing: 👤 Share with 1 extra family member or friend for free ✔️ Film video with real-time workout data overlay options
What makes Calibrex different from other wearables like Apple Watch, Fitbit, Oura or Whoop?
Calibrex is the only wearable built specifically for strength training.
Instead of tracking passive health stats, it gives you real-time coaching on rep speed, form, and fatigue—so it feels like a personal trainer is with you every set.
How does Calibrex actually know what I’m doing during a workout?
Calibrex uses a proprietary sensor system combined with AI to detect your movement patterns, rep velocity, rest timing, and more. It can even tell what exercise you're doing—whether you're benching, squatting, or curling—and coach you in real time.
Do I need to wear it on my wrist for every workout?
Nope. Calibrex was designed to move with you. It magnetically detaches and can be placed directly on your barbell, dumbbell, or cable machine—wherever gives the best read for your lift.
Can Calibrex help me lift heavier or get stronger?
Yes. By tracking your power output and rep speed, Calibrex tells you exactly when to push harder or back off. It’s the fastest way to stop guessing and start progressing—backed by science and used by pro athletes.
What kind of training programs are included in the app?
You’ll get access to AI-driven workouts personalized to your goals—whether it’s building strength, power, muscle, endurance or training for longevity. Over time, the system adapts and evolves with you based on your actual performance.
Do I need a gym to use Calibrex?
Not necessarily. You can use it with home dumbbells, bodyweight exercises, and resistance bands. It’s compact, portable, and designed to go wherever you train. Just like the worlds best personal trainer, it will give you a tailored workout plan based on your available equipment, previous data points and overarching fitness goal.
What happens if I miss a workout or take a break?
No guilt, no judgment. Calibrex tracks your progress over time and adjusts your recommendations based on how you’re feeling when you return. It's built to help you stay consistent—not perfect. It also won't charge you for cancellation or no show fees 😎
How long does the battery last?
Calibrex lasts up to 3 weeks on a single charge with regular use (4 workouts/wk). Charging takes less than an hour, and you’ll get a heads-up before it ever runs low.
Is Calibrex covered under warranty?
Yes, your brand new Calibrex is backed by our 2-year warranty. We understand how important it is to you to be able to use your Calibrex during every single workout.
Does it work on iOS & Android?
Yes, the Calibrex app is available on both iOS and Android.
Do you ship internationally?
Yes. Calibrex has been shipping internationally since 2021, and we have devices deployed in over 17 countries. In fact, almost 20% of our total userbase is international.
We collect duties and taxes upfront, and the Calibrex will be delivered in 2-5 business days depending on your choice at checkout. No customs hassle. Prices are calculated in real-time at checkout to lock in the lowest price possible.
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