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 v5.0 released

Today we released Heart Graph v5.0 - with WatchOS 4 we are finally able to bring Apple Watch users the full functionality of Heart Graph on the iPhone:

  • If you start your workout using the phone, you will see the graph in real time on the phone, and have access to zone and heart rate alarms, planned workouts, rep counting and reference sets.
  • If you'd rather use the Heart Graph on your Watch as you do now, you can still keep using it just the same as before.
  • Haptics are played on the Watch for the heart rate alarm and heart rate zone alarms.
  • WatchOS 4 is now required to run Heart Graph on your Apple Watch.

We've also made the following improvements to the app on the phone:

  • Support for iPhoneX.
  • Remove display of blue Premium Banners once Premium Features are purchased.
  • Simplify the display of the list of existing workouts and include the duration of each workout.
  • Improve selection of workout type so that it is chosen once when starting a new workout; the three most recent types of workout you've performed are remembered for ease of access.
  • Add "Other exercise" as a workout type option.
  • Add workout type and location details to planned workouts.

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.