September was the month Korvi started to feel like one product rather than two. Our sensors started working inside test versions of the Korvi app, the next generation of hardware went into production, and more lifters than ever found us on their own.
Here’s the update.
Sensors and App, Finally Together
Until now, our sensors and our app lived separate lives. The sensors ran through a development tool built for testing; the app was a workout tracker you could use without them.
This month, we got the two working together in test versions of the Korvi app. Start a workout, pick your exercise, and the first time round you teach Korvi the movement. From then on, the sensors count your reps automatically as you train, feeding straight into your workout log. No tapping, no counting under your breath, no losing track on set four.
It’s not ready for public release yet, and there’s plenty still to refine. But it’s the first time the whole product has worked as one. Rep counting is the foundation for everything else we want to build, so getting it working inside the real app was the milestone we’d been working towards.
Building the Insights That Actually Change Your Training
Once a sensor can reliably find each rep, it can start telling you things about it. The temptation at that point is to show you everything: every angle, every speed, every number the hardware can produce.
We’ve decided not to do that.
Instead, we’re applying one simple test to every metric: would this change how you train? If the answer is no, it doesn’t earn a place on your screen. That leaves a short list of things that genuinely matter to most lifters, and the one we keep coming back to first is range of motion.
Case study: range of motion in the squat
Range of motion is how far a joint travels through a rep. In the squat, it’s how low you go, and it’s one of the most argued-about topics in strength training. It affects which muscles do the work, how much weight you can move, and whether a lift counts at all in powerlifting (where the crease of the hip has to drop below the top of the knee).
Yet almost nobody knows their actual range of motion. You can’t see it yourself mid-rep, a mirror shows you the wrong angle, and nobody reviews footage of every set. A few general principles hold true:
- Range of motion is individual. Hip structure, ankle mobility and limb length all shape how far you can comfortably move. There’s no single correct number for everyone.
- Consistency matters more than one perfect rep. Hitting the same range on every rep of a set says more about control than one deep first rep.
- It shrinks as you tire. Most lifters’ reps get shorter towards the end of a hard set without them noticing, which is often a sign the weight or the set length is outrunning their form.
That last point is where tracking becomes genuinely useful: not knowing your range of motion on one good rep, but seeing when and how it drops off.
Range of motion is the first of a small set of insights we’re developing, alongside rep speed and left–right balance. We’re still working out exactly how these will look in the app, so expect them to evolve before you see them.
V3.1 Sensors Are Being Built
Our next-generation V3.1 sensor boards went into production this month and have now arrived. We’re now turning them on, testing them, and building them into full sets.
V3.1 is the upgrade that lets us move faster. Our current sensors take a long time to assemble by hand, which means the whole team has effectively been sharing one set. V3.1 is designed to be put together quickly and without soldering, so everyone on the team can train with their own set and collect data in parallel. More sensors in more hands means faster progress on everything above.
A Better App, Shaped by Real Lifters
Downloads have picked up noticeably since mid-September, almost all of them organic. More importantly, people are writing back. We’ve had genuinely useful feedback from lifters across the strength community, and the powerlifting crowd in particular has been incredibly generous with their time.
That feedback is directly shaping the app. This month we fixed a unit-switching bug a coach flagged when logging workouts for his clients, made exercise instructions easier to find, and have been working through a steady list of small friction points that stop people from logging a session.
That’s now our main focus. Getting someone to download a gym tracker app is one thing; getting them to actually open it and log a workout is the real challenge. Over the coming weeks, we’re concentrating on making it as quick and easy as possible to go from opening Korvi to finishing a session.
We’ve also rebuilt the Korvi website. The homepage now makes it easier to get straight to the app, and there’s a live counter showing workouts and reps logged by Korvi users, ticking up in real time. We’ve also launched a free one-rep max calculator: enter a weight and your reps, and it estimates your 1RM.
Growing on Instagram
Our reels are now regularly passing 1,000 views each, and a strength coach found us through one of our more ridiculous videos this month, which feels like the right way to meet people.
But let’s be honest: we’re still small. Korvi is a team of four with no advertising budget, and every new follower and download genuinely makes a difference to us. If you know someone who lifts, or a friend or family member who’d like an easier way to track their training, please send Korvi their way. It’s free, and it’s the single biggest thing you can do to help us keep growing.
You can follow along on Instagram, where we share the build as it happens.
We also published a new guide on muscle fatigue, explaining what’s actually happening when a set starts to fall apart.
What’s Next
October is about three things:
- Getting V3.1 sets into the team’s hands, so data collection and testing can happen in parallel rather than through one set of sensors.
- Making rep counting robust across more exercises, using structured recordings of real sets in the gym.
- Removing friction from the app, so logging a workout is the easiest part of your session.
Korvi is free on iOS and Android, and works right now without any sensors at all. If you lift, give it a go and tell us what’s missing.
Thanks for following along.
The Korvi Team
Korvi is a free AI workout tracker and gym tracker app with adaptive training plans, automatic rep counting, and a wearable strength training sensor system in development. Available now on the App Store and Google Play.
