$100/hr coaching—without the $100 or the hour.

Designed and hand built in small batches with 🖤 in NYC.

Notice:
New batch drops soon! Sign up to be notified before it runs out. Ships late December.

Calibrex
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Calibrex

🛠️ Small Batches Hand-Built In NYC

🌎 Ships Worldwide | Free in USA

🔄 30 Day Returns

Basic Features - no subscription required
  • Rep tracking
  • Custom workouts
  • Basic workout summary

Put your cardio data to work

Integrations

Sync your Apple Health, Google Health, Ōura Ring or Garmin to enable your Calibrex coach to ultra personalize workouts based on sleep and readiness.

Calibrex Batch I Users

Calibrex Champions

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 Batch I 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 Batch I 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 Batch I Member
I went from being shy to doing full blown strength workouts all by myself within 2 weeks!
— Penny ACalibrex Batch I 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 Batch I 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 Batch I 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 Batch I 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 Batch I Member

25M Reps & Counting.

1500 + professional weightlifters, coaches, university programs, and fitness enthusiasts across more than 15 countries.

FAQs

If you don't find an answer to your question, feel free to reach us via the chat bubble on the bottom right of your screen. 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.

What makes Calibrex different from other wearables like Apple Watch, Fitbit, Oura or Whoop?

Calibrex is the only wearable built specifically for reps & 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 a gym to use Calibrex?

Not required – Calibrex meets you where you train. 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.

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 15 countries. In fact, about 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.