What’s New

Version 3.0.0

iOS 13 / watchOS 6 Supported!

· Dark Mode Supported
· Added New Activities
Disc Sports, Fitness Gaming
· Added Option to Estimate MaxHR
· Independent Watch Apps
· Added Now Playing View to Watch
· Accessibility Improvements
Voice Control, Voice Over
· Screen design Improvements

Some functions are only available on the latest OS.

Ratings and Reviews

4.8 out of 5
6.7K Ratings

6.7K Ratings

Lives in Houston ,

Very useful breakdown of heart rate zone

I use this on combination with strava and Apple to get a much deeper level of understanding, analysis and detail on my effort and hart rate and aerobic zones. Data is taken in from my device and from strava and then analyzed. I don’t use zones to measure my activity.

The analysis is excellent and really useful to monitor my improvement and effort. I can see how much time I spend in each zone and where I put my effort. I have used this to stay in a specific zone to burn fat or improve endurance.

I bought the premium which gives even more detail and stats on how I’ve performed. I’m very useful stuff and if you like our data this app is very good. Basically I haven’t seen any other mainstream app go to the lengths this one does. If you’re training for any sort of event or are trying to just get better in performance this gives you a great insight to how you’re doing.


Lots of glitches

I am a user of this app who had upgraded to Pro. I do HIIT training about 4-5 times a week, and often have to restart in the middle of the my workout for freezing up and not registering my heart rate correctly. Then recently, it stopped transferring data from my watch to the phone. After restarting both iWatch and iPhone, I tried to delete the app and re-install. It lost all of my data. I contacted customer service and they referred me to an online faqs page of what’s supposed to happen when one tries to delete the app (2 prompts are supposed to show up, the second allowing you to keep your health data). However the second prompt never showed up for me and the app deleted after the first prompt. I tried deleting again as a sanity check since I absolutely do not remember that second prompt, and again it deleted the app after the first prompt. Now my last 6 months of workout data is gone. I guess not the end of the world in the greater scheme of things, but still frustrating that the glitches in the app keeps it from working as it’s supposed to. Will be utilizing a different app, as this one is obviously not trustworthy.

2 stars because it’s great when it actually works.

Erikadeee ,

Dishonest about family sharing

The app is ok. I’d give it 3 stars because it freezes and twice randomly shut down in the middle of a run in the first week I used it.

One star because I’m unhappy that it says it’s shareable (through family sharing) on the app page and I paid for the upgraded version. But any app that forces you to pay for the upgraded version through the app is not truly shareable (it will charge each individual in the family share account for the upgraded version through the app). Apple and the developers should be more forthcoming with this feature (ie all upgraded apps should be able to be purchased directly through the App Store and not in app purchases which won’t allow family sharing features). Really dishonest.


Flask LLP
60 MB
Health & Fitness

Requires iOS 12.0 or later. Compatible with iPhone and iPod touch.


English, Japanese

Age Rating
Rated 4+
© Flask LLP
In-App Purchases
  1. PRO $4.99


  • Family Sharing

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

  • Siri

    Get things done within this app using just your voice.

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