EP Calipers provides electronic calipers to measure intervals on images of electrocardiograms (ECGs) or electrophysiologic recordings. Doctors, nurses and medical technicians photograph and send ECGs to each other via email and messaging using smart phones and tablets. It is difficult and inaccurate to make measurements on these images with mechanical calipers. EP Calipers can be used to make accurate ECG measurements and do calculations such as determining mean heart rate and corrected QT interval. Angles such as the beta angle in Brugada syndrome can be measured as well. Analyze ECG images you photograph or store on your device, as well as PDF files, such as ECGs generated by the AliveCor Kardia™ device.

What’s New

Version 3.0

New easier user interface
Other improvements

Ratings and Reviews

joemeyer ,

Excellent caliper for EKG rate and interval measurements

This iPhone application has a tiny footprint yet has powerful features. You can take a photo of the entire EKG or a portion of the EKG you're most interested in. You can manipulate the image size and orientation. Using the calipers did take a few minutes to figure out even with the instructions but now I find it easy to use and quite accurate for measuring rate and intervals and determining the QTc. Thank you for this wonderful application. also thank you for the updates.

jtcardsfellow ,

Stick with your pocket calipers

Poor design. Not intuitive. Instructions cumbersome. Stick to the calipers.


EP Studios
17.3 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, Russian

Age Rating
Rated 12+ for the following:
Infrequent/Mild Medical/Treatment Information
© 2015 - 2018 EP Studios, Inc.


  • Family Sharing

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

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