Your tennis companion

Your phone is
now a line judge

Mount your phone, play your match. ACE watches the lines, keeps the score, builds your stats and saves your best points as clips — no sensors, no camera rigs, no arguments.

✓Challenge like the pros — reviewed in seconds, with the margin in cm
✓Live scoring that follows the match by itself
✓Real stats from every point you play
Download on the App Store Free · Pro optional
iPhone only for now — Android is on the list.
ACE
Clips
Muted
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Line call
IN by 3.2cm
INon review
20 Jul 2026
vsAlex·Today
0:00
0:00
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Line call
OUT by 1.4cm
OUTon review
20 Jul 2026
vsAlex·Today
0:00
0:00
Muted
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Line call
IN by 0.8cm
INon review
18 Jul 2026
vsDan K.·2 days ago
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Line callsLive scoringReal statsClipsLaddersChallenge the call Line callsLive scoringReal statsClipsLaddersChallenge the call
Challenge the call

Not sure it was in?
Review it.

Tap CHALLENGE THE CALL and ACE replays the bounce — verdict, distance to the line in centimetres, and a confidence score. The point is awarded, the clip is saved, the argument is over.

IN
Ball landed 3.2cm inside the baseline · Confidence 87%
THE CALL — ACE review screen showing the bounce point 3.2cm inside the baseline, verdict IN, confidence 87%
ACE live scoreboard — points, games and sets tracked automatically while recording
My stats

Every point you play
counts

ACE keeps an umpire's notebook of your matches. Win/loss record, break points won and saved, tiebreaks, deuce points — real numbers from real play, not guesswork.

✓Win / loss record with win rate, by month, year or all time
✓Pressure performance — do you raise your game on big points?
✓ACE Rating out of 10, from "New to the game" to "Elite" (Pro)
My stats — win/loss record 14-6, 70% win rate
ACE Pro insights

Know your game
like a coach does

Service game, return game, surface splits, first-strike vs grind — with honest verdicts and training suggestions built from your own points.

✓Serve & return dominance — hold %, break %, points won by serve
✓Pressure differential — your win % on big points vs overall
✓Play-style read — "Power baseliner: you dominate short rallies"
Pro insights — pressure performance, first strike vs grind, play-style read: Power baseliner
Match setup

Any format,
any surface

Singles or doubles, single set to best-of-5 Grand Slam scoring, grass to carpet. Pick your challenges per set — two each like the tour, or unlimited just for fun.

✓5 match formats including super tiebreak & no-ad scoring
✓Surface tracking feeds your stats — know your best court
✓Ladders & rivalries — climb the rankings with your club
New match setup — format, surface, challenges
How it works

Three steps to
your first call

1
Mount your phone
Clamp it to the back fence or a tripod behind the baseline, about head height, back camera facing the court. A water bottle works in a pinch.
2
Calibrate in seconds
ACE finds the court lines by itself and locks on. Setup audio talks you through it, so you never need to walk back to check the screen.
3
Just play
Score updates itself. Not sure about a bounce? Challenge it — verdict in seconds, clip saved. Full stats waiting when you shake hands.
Position your phone — clamped to back fence, tripod behind baseline, or propped on a bench
Pricing

Free to play.
Pro to dominate.

Free
£0
Forever. No card, no catch.
✓Line calling with 2 challenges per set, each player
✓Live scoring — every format, every surface
✓Match history & win/loss record
✓Ladders with your club or friends
Save 20% yearly
ACE Pro
£4.99 / month
or £47.99 / year (£4/month) · cancel anytime
✓Unlimited challenges — review every close call
✓Pro Insights — serve, return, pressure, play-style
✓ACE Rating — your game, scored out of 10
✓Clips — auto-saved highlights, watermarked shares
Billed through the App Store. Subscriptions auto-renew until cancelled — manage anytime in Settings.
Your tennis companion

Download now.
Start playing.

Free on iPhone. Your next match gets a line judge, a scoreboard and a stats team.

Download on the App Store