Meet Calibrex — the wearable built for lifting.
Calibrex is a tiny magnetic wearable that captures every rep, rest, and movement with unmatched precision — giving you deep, personalized insight into your training, and live audio coaching.
Whether you're chasing strength, speed, or endurance, Calibrex adapts to your goals and pushes you further with intelligent feedback, advanced tracking, and tailored workouts that grow with you.
Get coached through every set with live audio feedback — tailored to your goals, training style, and performance history.
Set Score – How well you executed each rep and how intensely you pushed.
Difficulty Score – How close you came to muscle failure.
Speed Score – How closely your rep speed matched your target training zone.
Tempo Score – How much time your muscles spent under tension.
Discover powerful trends across your training — like increasing bench press volume, longer rest times, or missed muscle groups. Get a clearer picture of how balanced your program is across your entire body.
25M Reps & Counting.
1500 + professional weightlifters, coaches, university programs, and fitness enthusiasts across more than 15 countries.
The Calibrex app has improved substantially as to where it was in late 2025. I know firsthand, as I submitted literally dozens of enhancement requests to this U.S.-based small startup. The owners reached out to talk on multiple occasions and most importantly, addressed many of the earlier software issues. The customer service is second to none and the accuracy of repetition counting is a 9 out of 10 (I expect it to improve with future updates). Philip and Nick sent me a replacement unit when mine had connectivity issues, and it has worked flawlessly ever since. Shipping was fast and free. This is one of the few apps that when updated in the App Store, I will open it to see the new enhancements page and whatever issues were addressed. Yes, the updates have been that good. I was not compensated for this review.
Don’t sleep on this device - total game changer in FitTech
Sgillz44
There’s not a single product akin to Calibrex. There have been kickstarters that failed. Calibrex stands in a class of its own it’s brand new yet the owners and founders remain completely dedicated and reachable for feedback, troubleshooting and updates. Which btw there are constant new features. Personally, Calibrex has been the mediumThat has enabled me to be consistent in my exercise routine for the first time in my life and I’m 40. Prior to Calibrex it was random guessing and failure. Now I use it 3-5x a week with progressive overload tailored to me. Love this device.
So COOL!!!
432es234
I got a calibrex to take over my training and so far I love it! The audio guidance through the workout is a game changer, I just do what it says in my headphones and get a good workout every time. Now that I have the hang of it, I don’t see how I can go back to working out without it. One more thing: I found a feature was missing, asked the team in the app chat, and the built it for me THE SAME DAY!!!
I want to like it
Will-Cali
I was a pre-order - I love the idea but the execution leaves a lot to be desired. The device itself seems well made and it does learn but it missed reps on all but the last set of my workout.The bigger issue is that unless you catch the error immediately, you can't go back and fix either the rep count or the weight. That alone makes me very skeptical about using the app again. Beyond that, there are a variety of v1 polish issues - maybe the biggest is the incredibly painful exercise reorder issue. All of this can be fixed - we'll see if they do.
Developer Response
Hey Will-Sorry to hear your experience didn't meet your expectations. Since you've been gone, we have fixed and updated all that you mentioned:✔️ Rep detection greatly improved✔️ Global log management, update reps and weight of any set at any time✔️ Exercises can be swapped and reordered before or during your sessions-> Adding videos for each exerciseCome on back when you're ready to automate your workouts 💪Quick reminder that as a Founding Member you have direct access to the founders, and access to the feature requests page where you can vote for new features and upvote existing posts from other Calibrex members. We add new features based on the board on a weekly basis.
Improved AI Voice Agent and coaching!
Home screen upgrades
Data display upgrades
Stability fixes
Version 1.8.2
The developer, CalibrexInc, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Health & Fitness
Location
Contact Info
User Content
Identifiers
Usage Data
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
CALIBREX INC.
Size
156.8 MB
Category
Health & Fitness
Compatibility
Requires iOS 15.1 or later.
iPhone Requires iOS 15.1 or later.
iPad Requires iPadOS 15.1 or later.
iPod touch Requires iOS 15.1 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
