Join the waitlist
Meet your tennis agent.
An AI coach that watches your body through your phone, feels your wrist through Apple Watch and your racket through Core. It decides the one thing to fix, and checks it next time.
Your phone, your watch, your racket. One agent.
Each one sees a different part of your swing. Together they tell you the one thing to change.
Sees your whole swing
- Your swing traced as a skeleton, frame by frame
- Where you meet the ball compared with your front hip
- Knee bend and follow-through checks
- Before and after, side by side
Feels how you swing
- Swing speed for every shot
- How your forearm turns through contact
- A gentle tap on your wrist with your one fix
- Your session at a glance, between points
Knows how you hit
- How often you find the sweet spot
- Where on the strings each ball lands
- Racket speed at the moment of contact
- Every forehand, backhand and serve, counted
See where every ball met your strings.
Ball-yellow dots found the sweet spot; coral rings didn't. Put that next to your video and your wrist data, and the reason becomes clear.
It sees the whole chain, not just your arm.
Every good stroke starts at the ground and passes through legs, hips, trunk and shoulder to the racket. Our AI tracks that chain in your video and finds the link that breaks first.
- 01Find your body33 points on every frame of 60 fps video.
- 02Turn points into motionJoint angles, segment speeds and timing.
- 03Apply kinesiologyKnee bend, contact point, follow-through.
- 04One fix, or a re-filmUnclear video? It asks again, not guesses.
Body, wrist, racket. Locked to one moment.
The logo, on your strings. Feeling every hit.
A good dampener first: light, small and quiet. One thin round piece sits in the middle of your strings, with nothing to clip on or twist.
Target specs for the prototype. Core is in development. Try the 3D view at the top.
One piece. Five colors. Set into your strings.
Core is now a single thin disc set into the centre of your strings: no sleeve, no clip, nothing to twist. The sensor and the logo light live inside. Pick the color that suits your racket.
- Where it goes
- Centre of the strings, between the two middle mains
- Size
- Ø24 mm · about 7 mm thick (target)
- Build
- One sealed piece, no sleeve or loose parts
Set into the strings
Core sits right in the centre of your string bed. The two middle mains and the centre cross run through it, so it stays put through every hit.Thin, about 7 mm
One sealed piece instead of a sleeve plus a sensor. Lower on the strings, nothing to lose, and quiet like a normal dampener.Five colors
Pink, ball yellow, club green, white and brushed silver. The logo line on top glows with each hit.24 lessons. From your first grip to your first match.
Each lesson has a 3D demonstration from the side, the same angle you film from. Watch the move, record your try, get one correction.
Keep the racket face a touch taller
Watch the 3D demo for 2 minutes, then record your forehand. Start
Founding 100Be one of the first 100 players.
We're starting with people just picking up a racket and people working toward their first match.
- Your first one-fix analysis, free
- An invitation to test the Core prototype
- A say in the drills and lessons we build next
Tell us a little about your tennis.
Your level, where you play, and whether you'd like to test Core. We invite the right players first.
Join the waitlist See a lesson firstOpens Google Forms · Takes about a minute. Your email will only be used for HitThrough early-access updates.