Download_on_the_App_Store_Badge_US-UK_135x40Welcome to Smoky Cat Software Ltd., creator of apps for iPhone®, iPad® and iPod touch®. 

Make your workout more effective! See your heart rate respond to exercise so you can train at the optimal level.

Your body is different every day, and it is easy to over-train or take it too easy. Perhaps you’re tired from work or have a minor illness – it can be better to do a lighter session and give your body the time it needs to recover. Or maybe this is one of those days when you don’t feel fully motivated, but actually your body is ready for anything! Heart rate monitoring puts you in control of how hard your workout should be.


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Heart Graph v4.4.1 released

Today we released Heart Graph v4.4.1, including:

  • Add live heart rate zone histogram to the phone during recording
  • Add ability to define annotation markers during workouts
  • Add option for coloured zone bands instead of coloured set types
  • Add option to display rolling mean during workout in place of total workout mean
  • Add option to vibrate on alarms as well as play a sound
  • Fix bug where app crashed if trying to save an image to the Camera Roll

Heart Graph v4.0 released with native Apple Watch app

We are pleased to announce that Heart Graph v4.0 is now available on the App Store,  including our new native Apple Watch app:

  • See a graph of your heart rate on your wrist during your workouts
  • Record resting heart rate directly from the Watch
  • View heart rate zones on the Watch in real-time during your workout
  • Quickly review up to 12 hours of recent heart rate data in the History view


We’ve also been making improvements to the main app itself, building on the successful release of Heart Graph v3.10:

  • New Apple Watch mode to simplify the UI for Apple Watch users
  • New Analysis button for analysing heart rate zone data aggregated over days, weeks or months


  • Add AirDrop support for transferring workouts between devices
  • You can now long press on a workout in the list to export to AirDrop or Dropbox
  • Simplification of Home screen - all comparison features are now behind the Compare Workouts button
  • Audio improvements for volume and Bluetooth headphones
  • Minor bug fixes and enhancements

More details can be found in our Press Release.

Tutorial videos

To help you get the most out of Heart Graph, we've put together some short tutorial videos. If you'd like to see videos covering other aspects of the app, please let us know.