Tennis Line Call App 4+

Best AI line calls Tennis App

Line Call LLC

Designed for iPhone

    • 4.7 • 19 Ratings
    • Free
    • Offers In-App Purchases


The best tennis app to challenge tough line calls and clock your serve speed with just your iPhone on a tripod. Raise your arm up or challenge using your Apple Watch.

Turning your iPhone into an AI line umpire device. The tennis app to challenge line calls with reliable results. High frame rate, super simple, quick to setup.

Adopt the easy routine every amateur tennis player is striving for and play a fair tennis game:

1. Start the tennis app.
2. (optional) Sync up with your opponent by scanning QR code.
3. Setup your phone on a tripod facing your side of the court.
4. When there is a questionable line call, you have 10 seconds to trigger a line challenge by raising your right arm up for 3 seconds (beta), or using your Apple Watch. Your phone will show a steady flash for IN, a blinking flash for OUT, and the result will be audible. If you use an Apple Watch, you can see the results and picture there, too.

The Tennis Line Call App is the end of disagreements, cheating or self doubt about line calls when playing a tennis match.
You can also use the serve speed and In or Out analytics results to improve your game.

What’s New

Version 0.4.0

- Arm Up Challenge (beta)
- Instant Replay on phone for spectators and friends
- Optimized ball tracking
- Updated onboarding screens
- Bug fixes

Ratings and Reviews

4.7 out of 5
19 Ratings

19 Ratings

BCS4Tennis ,

Awesome app that’s been needed for a long time!

I have a few friends I play with who consistently make what I think are bad calls unintentionally. I probably do the same to them. Using this app has helped us all play with line call confidence. It’s seriously changed the dynamic of our games and takes away the doubt that sometimes arises with shots near or on the lines. It’s like having “Hawk-Eye” for ourselves. Cool app!


Absolutely worth it for a number of use cases, or just fun

I got it to double check my calls. I figure I won’t ever have a problem finding a match if I overrule myself haha!
It’s turned into a lot of fun for all involved. We use it for practicing serves and speed tracking mostly.
It’s extremely accurate.
I had a problem at first where calibration would fail a few times then finally work. It turns out some pickle ball lines got in the way. There is a public update coming out to correct that.
The founder/CEO sent me a direct email when that happened and he showed a ton of class in how he approached the issue.
I’m a fan. And I’ll enthusiastically recommend to anyone that hits a tennis ball regularly.

(~_~A) ,

Works for us

Been looking for a simple, accurate app that my family can use. This has settled so many disagreements. It’s like having a referee with you. Been recommending this to our friends as well. Thank you for making this app!

App Privacy

The developer, Line Call LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Identifiers

Data Linked to You

The following data may be collected and linked to your identity:

  • Identifiers

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Location
  • Contact Info
  • User Content
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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