Tired of asking your tennis opponent: "are you really sure?" In/Out has the solution: install an In/Out device in seconds on any court and get line calling challenges like the pros.

This app is the Companion app of the In/Out device.

What’s New

Version 2018.06.07

Minor fixes to improve the authentication process

Ratings and Reviews

2.8 out of 5
4 Ratings

4 Ratings

Prophecy_64 ,

So far, it shows promise

I’ve been following In/Out when this was just an idea. Happy to say, it shows tons of promise. With the obvious bugs that will plague this app and the In/Out device, I’m very excited to see the continued development of this app and the In/Out device. I’ve seen great improvements in just these few recent updates. Thank you for the hard work and dedication! Please continue improving the apps and the device. Hopefully we’ll have some great improvements before Springtime, when tennis starts to go full-swing.

Damie L ,

The phone app works great, need watch app.

So far the application runs great on my phone. However I could see tremendous benefit from having the same functionality on my watch. I can take a quick glance at my watch between serves our points.
Please release an Apple Watch companion app!

App Privacy

The developer, Gregoire Gentil, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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