Your game,
traced.
Prop your iPhone courtside and play. Badminton Sensei traces every shuttle, names every shot, clocks your smashes, calls the lines and keeps the score. All on your phone, no account, nothing uploaded.
- Free, every feature
- No account
- Works with no signal
- Singles & doubles
Prop. Play. Watch it back.
Prop your iPhone
Behind a baseline, a few feet up, whole court in view. Mark the four corners once. Or import a match you already filmed.
Just play
Your score shows on the Lock Screen and in the Dynamic Island while you play, with +1 and undo if you want them.
See everything
Tracers, shot names, smash speeds, line calls, stats, tips and a highlight reel, ready when you are.
A real amateur rally, filmed in a club gym, analysed on an iPhone: tracer, score and players, no studio cameras.
A coach, a line judge and a scorekeeper. In your pocket.
In, out, or too close?
Tap anywhere on the court to land a shuttle. Try right on a line.
A simplified demo of how Sensei thinks about line calls. In the app, the court comes from your video and the uncertainty from the camera. How line calls work →
Nothing leaves your iPhone.
Every frame is analysed on the device with Apple's Core ML and Vision. There is no account to create, no server to upload to, and no data collected. Your games are yours.
Read the privacy policyOn-device AI
Tracking and analysis run on your iPhone.
No account
Open the app and play. Nothing to sign up for.
No ads, no tracking
No analytics, no ad networks, no data collected.
No signal? Fine.
Works in any gym, even in airplane mode.
Courtside toolkit
Score keeper, tournament generators and calculators. Free in your browser, no sign-up.
Score keeper
Badminton score keeper
Free online badminton scoreboard that knows the rules: 21-point scoring to 30 or the new 15-point format, who serves from which court, and change of ends.
Round robin
Badminton round robin generator
Generate a badminton round robin schedule for any number of players or teams, with courts, rounds, rotating partners and a live standings table.
Bracket
Badminton bracket generator
Make a badminton knockout bracket for 3 to 64 players or teams, with seeding and byes, then click winners through to the final and print it.
Smash speed
Smash speed calculator
Work out your badminton smash speed from a slow-motion video: distance, frames and frame rate in, km/h and mph out, with an honest error range.
Court size
Badminton court dimensions
Every badminton court measurement in feet, meters, cm and mm: length, width, service lines, net height and area, on an interactive diagram.
String tension
String tension calculator
Find the right badminton string tension for your level, style and racket, in lbs and kg, with a full tension chart from beginner to advanced.
Rules, records & technique
Rules
Badminton rules, made simple
All the badminton rules in plain English: scoring, serving, singles and doubles court lines, faults, lets and the net, with interactive diagrams.
9 min read
Scoring
How badminton scoring works
Badminton scoring explained: 21-point rally scoring, deuce, the 30-point cap, intervals, and the new 3×15 system coming in 2027, with a live simulator.
6 min read
Smash speed
The fastest badminton smashes ever recorded
The fastest badminton smash world records for men and women, in tests and in matches, and why a 500 km/h smash is slower than it sounds by the time it lands.
7 min read
Shots
Every badminton shot, explained
Badminton shot names with interactive trajectories: clear, drop, smash, net shot, drive, lift, push, kill and serves, and when each one wins points.
9 min read
Strategy
Doubles strategy that wins points
Attack and defence formations, when to rotate, where to serve and how mixed doubles differs, with an interactive positioning board.
9 min read
Filming
How to film your badminton games
Best camera angle, height, frame rate and mounts for filming badminton on a phone, so your video is good for both highlights and analysis.
7 min read
Frequently asked questions
What does Badminton Sensei do?
You prop an iPhone at the court or import a video of a match. Badminton Sensei tracks the shuttle, names each shot (smash, clear, drop, net shot, drive, lift, serve), estimates smash speed, calls landings in or out, keeps the singles or doubles score, and turns it all into stats and highlight reels.
Is Badminton Sensei free?
Yes. Every feature and every match is included, with no ads, no subscription and no in-app purchases.
Do my videos get uploaded anywhere?
No. All analysis runs on your iPhone with Apple's Core ML and Vision frameworks. There is no account and no server, and the app collects no data. It works in a gym with no signal.
Which iPhones does it work on?
iPhones running iOS 26 or later. Filming at 120 fps, which recent iPhones support, gives verified smash speeds.
Is there an Android version?
Not at the moment. Badminton Sensei is built for iPhone.
How accurate are the speeds and line calls?
They are estimates from a single camera, and the app tells you when it is unsure: uncertain speeds are marked and landings that are too close to call are labelled “Too close”. It is a training and fun tool, not a replacement for an umpire in official matches.
Where should I put my phone?
Behind one baseline, a few feet off the ground, with the whole court in view. Our filming guide shows the best spots and heights.
More answers on the support page, or email [email protected].
Stop guessing. Start seeing.
Badminton Sensei traces every shuttle, clocks your smashes, calls the lines and keeps the score, all on your iPhone.
Coming soon to theApp StoreFree · iPhone with iOS 26 or later- On-device AICore ML tracking, nothing uploaded
- No account, no adsEvery feature, every match, free
- Works with no signalAny gym, any court