The tennis app to challenge line calls like the pros
The most reliable and simple line calling app for tennis.
Try it now for free!
Simple and Reliable
Just your iPhone and portable Tripod. Our state-of-the-art algorithms do the rest.
This quick setup is becoming part of everyone's tennis routine!
1. Start the app and scan QR code with opponent.
*Link up to 4 phones for doubles!
2. Set your phones on tripods on the side of the court.
3. Raise your arm up (beta) or use your Apple Watch to make a line challenge.
4. See the result with flash and sound from your phone, or on your Apple Watch.
Tripods and Accessories
We've assembled a list of tripods and accessories in a custom Amazon list for you.
We recommend 60-inch tripods or above starting around $25. Most will fit in your tennis bag!
They all work for the Tennis Line Call App!
The Tennis Line Call App™
Stop wondering if the ball bounces In or Out. Focus on your game and have fun!
By using the Tennis Line Call App™, you can challenge questionable bounces and always make impartial line calls. You can fully concentrate on your tennis game while the app acts as your tennis line judge!Oh, and guess what?! Since your phone will be sitting on a tripod, you and your opponent can spend more time getting to know one another at the changeovers!Our Partners
Some of the people and organizations who support us and make this possible.
Conga Sports
Conga Sports is a network of affiliated racquet clubs and individuals searching for courts and others to play with. They welcome players of all levels and offer exciting programs from beginner classes and "playing just for fun" to advanced level competition.
eyes3
eyes3 is an advanced Electronic Line Calling and VAR system designed for elite and professionable Tournaments.
Iowa Startup Accelerator (ISA)
Iowa Startup Accelerator (ISA) is a unique 6-month accelerator with rolling admission and access to four distinct stages of investment for Iowa-based startup businesses. The accelerator program provides investment capital and a stage-specific bundle of resources appropriate for scaling your startup.
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