Everything Sensei sees
Prop your iPhone behind the baseline or import a video you already have. Badminton Sensei follows the shuttle, names every shot, clocks the smashes, calls the lines and keeps the score, then turns the night into stats, tips and highlights. All of it runs on the phone. Free, with every feature included.
- 7shot types named
- 4export shapes, up to 4K
- 0accounts, ads or uploads
Six things it does for you
Each one has its own page with an interactive demo. Pick the one you care about most.
Every shuttle, traced
The shuttle is a few centimetres of feathers moving faster than anything else in sport. Sensei runs TrackNetV3, an open-source shuttle-tracking network, on the iPhone itself with Core ML to find it in every frame, then draws the flight back onto your video.
- Glowing tracer drawn on your own footage
- Smash, clear, drop, net shot, drive, lift and serve
- Rallies found and split automatically
Clock it. Beat it.
Sensei maps the court, follows the shuttle off the racket and turns pixels into meters per second. It's an estimate from one camera, so it tells you how sure it is. Film at 120 fps and the readings are verified.
- Every smash measured, km/h or mph
- Uncertain readings are marked, not hidden
- Top smash charted match after match
In, out, or too close
Every landing is placed on a real court map and called against the singles or doubles lines. A single camera has a margin of error, wider at the far end, so when a landing sits inside that margin Sensei says “Too close” and leaves it to you.
The score keeps itself
Sensei splits the video into rallies, works out who won each one and applies the 21-point rules, including deuce, the 30-point cap, servers and service courts. Filming live, the score sits on your Lock Screen with +1 and undo buttons.
- Singles or doubles detected from the video
- Lock Screen and Dynamic Island scoreboard
- Fix one point, the whole match re-scores
Highlights worth posting
Studio builds a reel from the night's best moments with the tracer already on them. Make a share card for the match, your top smash or the rally of the night. Blur or pixelate faces before anything leaves your phone.
- Best rallies and fastest smashes, slow motion
- Original bundled music and stat overlays
- 9:16, 4:5, 16:9 or 1:1, up to 4K
Run club night
Make a crew for the people you play with, run a tournament on the night and keep a leaderboard all season. Results and cards travel straight between nearby iPhones, with no account and no server.
- Round robin, knockout, King of the Court
- Leaderboards and head-to-heads
- Share results phone to phone, no internet
Built for the whole season
Stats that mean something
Shot mix, rally lengths, where your shots land and how much court you cover, for every match.
Coach's tips
Patterns in plain language, like how deep your lifts go. Plus personal bests, streaks and badges.
Import from Photos
One video or a whole batch. Trim off the warm-up; analysis carries on in the background and pings you when it's ready.
Widgets, Siri, Action button
Last score and weekly goal widgets. “Start a badminton match in Badminton Sensei” from Siri or Control Center.
For everyone
VoiceOver, Dynamic Type, Reduce Motion, landscape and colour-blind-friendly markers.
A sample match
“Try a sample match” shows every feature in seconds, no court or filming needed.
What's in the free app
Everything. There is no paid tier, no in-app purchase, no trial and no ads. Here is the full list.
- Shuttle tracking with a glowing tracer on your own video
- Shot names: smash, clear, drop, net shot, drive, lift, serve
- Smash speed for every smash, in km/h or mph
- Line calls, with “Too close” when one camera can't be sure
- Automatic singles and doubles scoring, servers and sides
- Fix any point or add a missed rally; undo and redo
- Lock Screen and Dynamic Island scoreboard while filming
- Import one video or a batch from Photos, trim the warm-up
- Background analysis with a notification when it's ready
- Shot mix, rally lengths, landing spots, court coverage
- Progress over time, Coach's tips, personal bests, streaks, badges
- Highlight reels with slow motion, music and stats, up to 4K
- Share cards: match, smash speed, rally of the night
- Blur or pixelate faces before you share
- Crews, round robin, knockout and King of the Court
- Leaderboards, head-to-heads, phone-to-phone sharing
- Widgets, Control Center, Action button and Siri
- VoiceOver, Dynamic Type, Reduce Motion, landscape
Requires an iPhone with iOS 26 or later. English only for now. Not a replacement for an umpire in official matches.
Your games never leave your phone
Club footage shows faces, kids, venues. So Badminton Sensei was built to need none of the internet: every frame is analysed on the iPhone itself. Read the short, plain privacy policy.
Analysed on your iPhone
Core ML and Apple Vision do the work on the phone in your hand.
No account, no server
Nothing to sign up for and nowhere for your videos to be sent.
No ads, no tracking
No analytics or advertising SDKs. The App Store label is “Data Not Collected”.
Works with no signal
Basement hall, school gym, holiday court: it doesn't need the internet.
Frequently asked questions
Is Badminton Sensei really free?
Yes. Every feature is included for every match, with no subscription, no in-app purchases and no ads.
What do I need to use it?
An iPhone running iOS 26 or later. For live filming, something to prop the phone on behind a baseline, a few feet up, with the whole court in view. You can also import videos you've already filmed.
Does it work for doubles?
Yes. Sensei detects singles or doubles from the number of players in the video, applies the right court lines and serving rules, and lets you switch the format with one tap if it guessed wrong.
Does it upload my videos?
No. All analysis runs on your iPhone with Core ML and Apple Vision. The app has no account and no server, and makes no network requests.
How accurate are the speeds and line calls?
They are estimates from a single phone camera, and the app shows how sure it is. Smash speeds filmed at 120 fps are verified; landings too close to a line to call are marked “Too close” instead of guessed.
Is there an Android or web version?
No. Badminton Sensei is iPhone only. The free tools on this website work in any browser, though.
When can I download it?
Badminton Sensei is coming soon to the App Store. The download page will link to it as soon as it's live.
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