Isn't this just a smarter Fitbod?

A tracker logs what you type in. Notch has 4 sensors on your body reading the lift itself: depth, bar speed, time under tension, on every rep. The number comes from the movement itself.

Will it work at my gym?

Yes. The sensors are on your body, so they go wherever you train: a commercial gym, a garage, a hotel.

Do I need a coach to read all this?

No. Each set gets a score first. If you want to know why, the app says it in plain words, and the workout ends with a paragraph on what held up and what to change.

What comes in the box?

4 sensors, breathable mesh straps, a t-shirt that holds the chest sensor, a fast charging station with a USB cord, and a pouch to carry it all. Shipping is free.

Can I use the app without the sensors?

Yes, with a smaller set of features. The app reminds you to connect them when you are ready.

Learn from every rep you do

Q: Does it work on Android?

Not yet. Today the app is for iPhone.

Q: What happens after the first year?

The app continues on a yearly or monthly plan.

with 4 sensors on your body, from your first squat to your heaviest deadlift

Your own weight or any equipment

dumbbells, barbells, machines

Watch the rep back

3D replay of every set

Backed by research

80+ published studies

As seen on

From a single rep to months of training

Seen from below against the sky, a man lifting a heavy dumbbell from behind his head with both hands, a sensor strapped to his left upper arm

The 3D replay of a rep, with the weight, the target reps and the reps counted so far

See your form from the outside

Watch the rep back in 3D and see where depth, setup or lockout slipped

A braided woman midway through a dumbbell Romanian deadlift at home, seen close from behind, sensors on her upper arm and lower back

The set list logging itself: weight, reps, RPE and a score on each set

Leave the notebook at home

The sensors count your reps and start the next set when rest is over

Seen from above, a woman on an exercise mat reaching for the heavier of two dumbbells

Rep max table: the weight and the percentage of your max for 1 rep through to 6

Lift the right weight

Notch reads how fast the weight moves and picks the load for the next set

A curly-haired woman with a gym bag on her shoulder, walking past palm trees and smiling at her phone

Volume, strength and form scores, and the paragraph naming the squat, the deadlift and the drop in speed

Get a coach's note when you finish

What held up, what slipped and what to do next time, in one paragraph, read aloud if you like

A tattooed man midway through a weight-plate halo in a gym, with a sensor strapped to his upper arm

Overall progress by week, with volume, weight, range of motion and speed under the chart

Watch your records add up

Personal records, the load on each muscle group and how your lifts move, week by week

A woman moving into a half-kneeling lunge at home, with sensors on her arm and thigh

A 12-week program in 4 blocks, with the week's days and their exercise counts

Follow a program built in blocks

12 weeks in 4 blocks, hypertrophy to strength, each day listed with its exercises and minutes

A woman resting on a red running track after a set, sensors on her upper arm and chest

Set scores falling from 95 to 55 as the bar slows, and the app calling it severe fatigue

Know when the set is done

Rep speed drops before you feel tired, and the app shows by how much

Each Notch holds a cluster
of motion sensors. They take
150+ measurements of each lift
and fold them into 4 numbers
that tell you what to change

Range of motion

How far you actually moved, reported as a percentage of the full range
Bar speed

How fast the weight moved, in meters per second, and it drops before you feel tired
Time under tension

How long the muscle was actually working, counted across the whole set
Rep score

150+ measurements folded into a single answer: was that a good rep or not

A hand pressing the strap snug on the upper arm, the sensor on the outside

Train the way you already do

Put the sensors on. 4 sensors go on the upper arm, the thigh, the chest and the back of the hip. The straps are mesh, and the chest sensor sits in the t-shirt.

4 sensors go on the upper arm, the thigh, the chest and the back of the hip. The straps are mesh, and the chest sensor sits in the t-shirt.

A few months in, three things change

Lift heavier

The next weight comes from how fast the last set moved, so the load rises the moment you are ready.
Catch the rep that hurts

Form is checked every rep, and a slowing bar is caught before the rep that costs a back or an elbow.
Make good form a habit

The same correction on every rep until the good rep is the one you do without thinking.