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Zx: Heart Rate Zones Training icon

Zx: Heart Rate Zones Training

Interval Timer & HIIT Trainer
US flag US
1 of 1 storefronts
Content in en-US
70 Ratings
4.3
★★★★
Age Rating
4+
Years
Language
EN
+4 More
Size
53.3
MB

Information

Apple ID1457355997
Bundle IDnet.oversphere.zx
SellerSeller
Min iOS18.0
Min macOS15.0
Device familieswatch, iphone
Released2019-12-22
Copyright© 2026 OverSphere LLC
WebsiteLink ↗
Privacy policyLink ↗

Preview 2 platforms

iPhone 7 images

iPhone screenshot
iPhone screenshot
iPhone screenshot
iPhone screenshot
iPhone screenshot
iPhone screenshot
iPhone screenshot

Apple Watch 5 images

Apple Watch screenshot
Apple Watch screenshot
Apple Watch screenshot
Apple Watch screenshot
Apple Watch screenshot

What’s New Version 1.8

- Updated localization for German, French, Spanish, and Japanese - Added "Report Translation Issue" to Settings

Description

Zx is your personal heart rate coach designed to guide you through your interval training. Create your own interval workouts or download workouts created by the community. Official Zx workouts are updated regularly. Zx supports Apple Watch or any compatible stand alone bluetooth heart rate monitor. ◎ Benefits of HIIT: - Weight loss - Improve your body’s ability to burn fat - Increase your anaerobic threshold - Improve your vo2Max - Improve performance in sports - Feel better by releasing beta-endorphins - More fun then steady state training! ◎ Integrates with the Health app to gain deep insight into your training: - View relevant Heart Rate and Workout stats for Day, Week, and Month on the home screen - See which zone your workout heart rate has spent the most time in to help you plan your next workout. ——————-—- App Features ———————— ◎Open Mode (Apple Watch only): - Not up for a guided session? Open session lets you see what Zone you’re in and how long you’ve been in it. ◎ Guided Interval Training - Zx will help you stay in a specific zone for the right amount of time. ◎ Create custom workouts - Studio lets you create custom guided training suited to your personal goals ◎ Download workouts created by other users - See what other users have created, download and remix. Health Disclaimer: Zx cannot treat or diagnose any medical condition. Zx is designed to push you to your maximum heart rate; while there shouldn’t be cause for concern with healthy individuals, always consult with your physician prior to starting any training regimen. Subscription Terms: Your subscription automatically renews every month or year unless auto-renewal is turned off at least 24 hours before the end of the current subscription. 3 day free trial is provided for monthly subscriptions. You will be charged starting at $2.99 per month, depending on the subscription pack. Your account will be charged for a renewed subscription within 24 hours prior to the end of current subscription. You can manage your subscription and switch off the auto-renewal by accessing your iTunes account settings after purchase. You cannot cancel the current subscription during the active subscription period. Any unused part or time-span of a free trial period will be forfeited, as soon as you purchase a subscription. Buy subscribing, you affirm your agreement to our Terms of Use and Privacy Policy. Terms of Use: https://www.oversphere.net/terms-of-use/ Privacy Policy: https://www.oversphere.net/privacy-policy/

In-App Purchases US pricing

Zx Premium Subscription
Premium Monthly · Monthly$2.99
Premium Yearly · Yearly$24.99
Premium 6 months · 6 months 3-day free trial$9.99
Premium Monthly · Monthly$0.99
Premium 6 months · 6 months 3-day free trial$7.99
One-Time Purchases
Premium Lifetime Access$14.99

Capabilities

In-App Purchases

Accessibility

ipadiphonemacrealityDevicetvoswatch

Version history 25 versions

Build 881358637v1.82026-01-10 11:36:51
- Updated localization for German, French, Spanish, and Japanese - Added "Report Translation Issue" to Settings
Build 869017301v1.72024-09-19 23:04:19
- GOOOOOOOOOOOAAAALLLL! Add and track time spent in your target zone with this new feature. - Fixed an issue where created and downloaded workouts would take a long time to sync to the Watch app. - various bug fixes
Build 868081446v1.6.12024-08-09 08:37:49
- GOOOOOOOOOOOAAAALLLL! Add and track time spent in your target zone with this new feature. - Fixed an issue where created and downloaded workouts would take a long time to sync to the Watch app. - various bug fixes
Build 867853388v1.62024-08-08 14:31:51
- GOOOOOOOOOOOAAAALLLL! Add and track time spent in your target zone with this new feature. - Fixed an issue where created and downloaded workouts would take a long time to sync to the Watch app. - various bug fixes
Build 854145031v1.52022-12-31 16:11:07
- You can now add distance to indoor cycling workouts - Zone ranges added help you stay in your target zone - Studio interval limit has been removed
Build 844197865v1.4.122021-09-22 23:23:56
This update from Apple will improve the functionality of this app. No new features are included. - Fixed an issue preventing Watch app launching on WatchOS 8 If you have any issues, please reach out to support@oversphere.net
Build 843478784v1.4.112021-08-07 01:33:48
- New Official workouts! - Smaller time intervals for creating workouts - Ability to insert intervals while creating workouts - Voice guidance background audio support - Pause workout feature if you have any issues, please reach out to support@oversphere.net
Build 842737433v1.4.102021-06-21 17:37:51
- Workout Routes: visualize zone time in zones by seeing your zone route on the map in Workout History - Better voice coach mixing while playing Music and Podcasts If you have any issues or feature requests, please reach out to support@oversphere.net
Build 842612021v1.4.92021-06-11 00:52:06
- Workout Routes: visualize zone time in zones by seeing your zone route on the map in Workout History - Better voice coach mixing while playing Music and Podcasts If you have any issues or feature requests, please reach out to support@oversphere.net
Build 842130562v1.4.82021-05-18 23:27:06
- Fixed an issue with heart rate not being displayed properly. - various bug fixes and performance improvements If you have any issues, please reach out to support@oversphere.net
Build 841053193v1.4.72021-03-25 23:43:34
- added Elliptical as an available workout activity - improved workout creation experience - updated localizations if you have an issues, please reach out to support@oversphere.net
Build 840478305v1.4.62021-02-15 01:15:17
- Fixed and issue causing time in zones to not display properly - lowered Watch app requirement to WatchOS 6 (WatchOS 7 is still required to use complications) If you have any issues, please reach out to support@oversphere.net
Build 840304018v1.4.52021-02-02 13:02:32
- Daily Zx calculation adjustments - Added Fitness Level sync to Watch app settings - Fixed distance reporting when using kilometers - Changed the way METs are calculated - Added Avg METs and Avg Intensity to Workout History
Build 840166505v1.4.42021-01-23 02:20:16
Daily Zx complication! - check your Daily Zx without opening your iPhone. Complication will update when you finish a workout using the Zx Watch app, when you open the Zx Watch app, and will also try to update every 15 minutes in the background. - more complications coming soon! - potential fix for crash on launch Any issue or features, please reach out to support@oversphere.net
Build 840059703v1.4.32021-01-21 12:56:41
Daily Zx complication! - check your Daily Zx without opening your iPhone. Complication will update when you finish a workout using the Zx Watch app, when you open the Zx Watch app, and will also try to update every 15 minutes in the background. - more complications coming soon! Any issue or features, please reach out to support@oversphere.net
Build 839943608v1.4.22021-01-08 01:09:36
- Adjustments to Daily Zx calculations. You may notice it will be harder to reach an absolute max of 20. - Fitness level has been increased from 3 to 5 to allow for a more fine tuned Daily Zx. You may need to adjust your fitness level again when you first launch. Thanks for all your support! If you have any feedback or issues, please reach out to support@oversphere.net
Build 839877729v1.4.12021-01-02 21:48:10
Introducing Daily Zx! Get insight into your current cardiovascular load and see how your training is impacting your body. *fixed an issue preventing bluetooth or voice guidance to be enabled in settings Please send any feedback you have to support@oversphere.net
Build 839785623v1.42020-12-29 20:59:34
Introducing Daily Zx!  Get insight into your current cardiovascular load and see how your training is impacting your body. Please send any feedback you have to support@oversphere.net
Build 837765653v1.3.52020-09-15 14:13:02
- Fix for workout selection on Watch - METs and Zx points added to workout stats - Bluetooth HR monitor disconnection bug fixes - UI updates - workout history title bug fixes - Fixed "Contact Us" send to bug If you have any issues, please reach out to support@oversphere.net.
Build 837706030v1.3.32020-09-09 17:34:05
- METs and Zx points added to workout stats - Bluetooth HR monitor disconnection bug fixes - UI updates - workout history title bug fixes - Fixed "Contact Us" send to bug If you have any issues, please reach out to support@oversphere.net.
Build 837183795v1.3.12020-08-01 23:21:06
- added new FREE workouts! Please reach out to support@overpshere.net with any problems you may encounter.
Build 836691818v1.32020-07-06 02:19:26
- iPhone workout screen has been updated for consistency with the Watch app. - UI improvements - bug fixes and performance improvements Please reach out to support@overpshere.net with any problems you may encounter.
Build 835592735v1.2.22020-04-17 23:18:53
- bug fixes and performance improvements. As always, please reach out to support@oversphere.net with any issues and feature requests.
Build 835282632v1.2.12020-03-28 19:38:04
-Custom Zones! Users can now change their max heart rate and customize each zone to create a more personalized training experience. - Fixed crash on iPad As always, please reach out to support@oversphere.net with any issues and feature requests. Train on!
Build 835046377v1.22020-03-18 20:27:13
Custom Zones! Users can now change their max heart rate and customize each zone to create a more personalized training experience.  As always, please reach out to support@oversphere.net with any issues and feature requests. Train on!
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Availability 1 of 1 storefronts

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US en-USFree704.31.8

Change log 29 changes · US

releaseNotes updated
- Updated localization for German, French, Spanish, and Japanese - Added "Report Translation Issue" to Settings
description updated
Zx is your personal heart rate coach designed to guide you through your interval training. Create your own interval workouts or download workouts created by the
subtitle updated
Interval Timer & HIIT Trainer
name updated
Zx: Heart Rate Zones Training
Version 1.8 released
- Updated localization for German, French, Spanish, and Japanese - Added "Report Translation Issue" to Settings
Version 1.7 released
- GOOOOOOOOOOOAAAALLLL! Add and track time spent in your target zone with this new feature. - Fixed an issue where created and downloaded workouts would take a long time to sync to the Watch app. - various bug fixes
Version 1.6.1 released
- GOOOOOOOOOOOAAAALLLL! Add and track time spent in your target zone with this new feature. - Fixed an issue where created and downloaded workouts would take a long time to sync to the Watch app. - various bug fixes
Version 1.6 released
- GOOOOOOOOOOOAAAALLLL! Add and track time spent in your target zone with this new feature. - Fixed an issue where created and downloaded workouts would take a long time to sync to the Watch app. - various bug fixes
Version 1.5 released
- You can now add distance to indoor cycling workouts - Zone ranges added help you stay in your target zone - Studio interval limit has been removed
Version 1.4.12 released
This update from Apple will improve the functionality of this app. No new features are included. - Fixed an issue preventing Watch app launching on WatchOS 8 If you have any issues, please reach out to support@oversphere.net
Version 1.4.11 released
- New Official workouts! - Smaller time intervals for creating workouts - Ability to insert intervals while creating workouts - Voice guidance background audio support - Pause workout feature if you have any issues, please reach out to supp
Version 1.4.10 released
- Workout Routes: visualize zone time in zones by seeing your zone route on the map in Workout History - Better voice coach mixing while playing Music and Podcasts If you have any issues or feature requests, please reach out to support@over
Version 1.4.9 released
- Workout Routes: visualize zone time in zones by seeing your zone route on the map in Workout History - Better voice coach mixing while playing Music and Podcasts If you have any issues or feature requests, please reach out to support@over
Version 1.4.8 released
- Fixed an issue with heart rate not being displayed properly. - various bug fixes and performance improvements If you have any issues, please reach out to support@oversphere.net
Version 1.4.7 released
- added Elliptical as an available workout activity - improved workout creation experience - updated localizations if you have an issues, please reach out to support@oversphere.net
Version 1.4.6 released
- Fixed and issue causing time in zones to not display properly - lowered Watch app requirement to WatchOS 6 (WatchOS 7 is still required to use complications) If you have any issues, please reach out to support@oversphere.net
Version 1.4.5 released
- Daily Zx calculation adjustments - Added Fitness Level sync to Watch app settings - Fixed distance reporting when using kilometers - Changed the way METs are calculated - Added Avg METs and Avg Intensity to Workout History
Version 1.4.4 released
Daily Zx complication! - check your Daily Zx without opening your iPhone. Complication will update when you finish a workout using the Zx Watch app, when you open the Zx Watch app, and will also try to update every 15 minutes in the backgro
Version 1.4.3 released
Daily Zx complication! - check your Daily Zx without opening your iPhone. Complication will update when you finish a workout using the Zx Watch app, when you open the Zx Watch app, and will also try to update every 15 minutes in the backgro
Version 1.4.2 released
- Adjustments to Daily Zx calculations. You may notice it will be harder to reach an absolute max of 20. - Fitness level has been increased from 3 to 5 to allow for a more fine tuned Daily Zx. You may need to adjust your fitness level again
Version 1.4.1 released
Introducing Daily Zx! Get insight into your current cardiovascular load and see how your training is impacting your body. *fixed an issue preventing bluetooth or voice guidance to be enabled in settings Please send any feedback you have
Version 1.4 released
Introducing Daily Zx!  Get insight into your current cardiovascular load and see how your training is impacting your body. Please send any feedback you have to support@oversphere.net
Version 1.3.5 released
- Fix for workout selection on Watch - METs and Zx points added to workout stats - Bluetooth HR monitor disconnection bug fixes - UI updates - workout history title bug fixes - Fixed "Contact Us" send to bug If you have any issues, please r
Version 1.3.3 released
- METs and Zx points added to workout stats - Bluetooth HR monitor disconnection bug fixes - UI updates - workout history title bug fixes - Fixed "Contact Us" send to bug If you have any issues, please reach out to support@oversphere.net.
Version 1.3.1 released
- added new FREE workouts! Please reach out to support@overpshere.net with any problems you may encounter.
Version 1.3 released
- iPhone workout screen has been updated for consistency with the Watch app. - UI improvements - bug fixes and performance improvements Please reach out to support@overpshere.net with any problems you may encounter.
Version 1.2.2 released
- bug fixes and performance improvements. As always, please reach out to support@oversphere.net with any issues and feature requests.
Version 1.2.1 released
-Custom Zones! Users can now change their max heart rate and customize each zone to create a more personalized training experience. - Fixed crash on iPad As always, please reach out to support@oversphere.net with any issues and feature re
Version 1.2 released
Custom Zones! Users can now change their max heart rate and customize each zone to create a more personalized training experience.  As always, please reach out to support@oversphere.net with any issues and feature requests. Train on!
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