The score keeps itself
Automatic badminton scoring from the video itself: Sensei finds every rally, works out who won it and keeps a proper singles or doubles score, with servers, sides and games. Get one wrong? Fix that point and the whole match re-scores.
- Singles and doubles detected
- Servers and service courts
- Lock Screen scoreboard
- Undo and redo
From rallies to a real score
Scoring isn't counting. It's knowing who serves, from which court, when the game ends and what happens at 20-all. Sensei handles all of it.
- Step 1
Count the players
Two on court or four? The format is picked from the video, which also sets the court lines and serving rules.
- Step 2
Split the rallies
The shuttle tracker sees when play starts and stops, so the video is cut into rallies automatically.
- Step 3
Award each point
Where and how each rally ended decides who won it. Points it isn't sure about are flagged to confirm.
- Step 4
Apply the rules
21-point rally scoring, win by two, capped at 30, best of three, with the right server and service court every point.
Fix a point. Watch it re-score.
The match is a list of rally winners. Add rallies, tap any earlier rally to flip it, and see the score, server and Lock Screen update together.
Scoring engine
Same rules as the app: BWF 21-point scoring
Sam & Priya
Leo & Mia
Leo serves from the right service court
Rallies this game · tap one to give the point to the other side
Saturday 4 October
22:11
Sam & Priya
17 – 14
Leo & Mia
Mock Lock Screen. The +1 and undo buttons work.
Score on your Lock Screen
Filming live, the score sits on your Lock Screen and in the Dynamic Island. Prefer to tap points yourself between rallies? The +1 and undo buttons are right there, and the points you tap are matched to the rallies Sensei finds afterwards.
- Live Activity and Dynamic Island while filming
- +1 and undo right from the Lock Screen
- Taps matched to the rallies Sensei finds
Wrong once. Right everywhere.
A scoring app is only as good as how easily you can fix it.
Change a winner
Press and hold any rally and pick who won it. Servers, sides and later games all follow.
Add a missed rally
Scrub to it and add it at the playhead. The match re-scores from that point on.
Undo and redo
Every fix can be undone and redone, so experimenting is safe.
Points to confirm
Rallies the app was unsure about are collected in one list, so checking takes a minute.
Honest limits
It scores what it can see
A rally that happens off camera, or a stoppage that looks like play, can be missed or split. Add or fix it in a tap.
Close calls need you
When a line call is “Too close”, the point goes to confirm instead of being guessed.
People walking across the court
Someone crossing the frame can confuse the singles/doubles count. Switch the format in one tap; the match re-scores.
Friendly games, not officiating
It keeps a great record of your games but isn't a replacement for an umpire in official matches.
Frequently asked questions
Can an app keep the badminton score automatically?
Yes. Badminton Sensei finds each rally in the video, decides who won it and applies the 21-point rules, including deuce, the 30-point cap and best of three games. You can correct any point.
Does it work for doubles scoring?
Yes. It detects doubles from the video and tracks the serving side, the server and which service court they serve from, under the BWF Laws of Badminton.
What happens when it gets a point wrong?
Press and hold the rally, choose who won it, and the whole match re-scores, including servers, sides and later games. Every fix can be undone and redone.
Can I see the score while filming?
Yes. A Live Activity shows the score on your Lock Screen and in the Dynamic Island, with +1 and undo buttons.
Is there a free badminton scoreboard app?
Badminton Sensei is free with every feature included. If you just want a manual scoreboard in your browser, try our free online score keeper.
How does badminton scoring work?
Every rally wins a point. A game goes to 21, but you must win by two; at 29-all the next point wins. A match is best of three games. Our scoring guide explains it with a simulator.
Prefer to keep score by hand? Try the free online score keeper or print a score sheet.
Stop guessing. Start seeing.
Play the point. Let the phone count. 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