PAI (Personal Activity Intelligence) is a revolutionary new system that turns your heart rate data into a single, personal score, showing how much activity you need to stay healthy.

PAI’s scientifically validated algorithm is based on your personal profile and heart rate data from all-day activity and workouts to calculate your PAI score. The goal is simple: keep your PAI score at 100 or above to live a healthier, longer life*.

PAI is the most accurate and meaningful activity metric:

It’s Simple: PAI is easy to understand, providing a single score to track.

It’s for Everyone: PAI tracks all activity as it is based on your heart rate, and it also works for all fitness levels because PAI is personalized to the individual.

It’s Meaningful: PAI provides feedback on your activity, showing the health effects so that you know if you are staying active enough.

It’s Scientific: PAI is based on one of the world’s largest health studies. Research has shown that maintaining a PAI score at 100 or above can reduce the risk of cardiovascular disease by up to 25% and extend lives by an average of 5 years.

It’s Adaptive: PAI adapts as you progress. The more fit you are, the harder it will be to earn PAI, keeping you appropriately challenged.

It’s Flexible: Your PAI score is based on the past 7 days activity, providing flexibility around your busy lifestyle.

If you have questions or need help to configure your device with Mio PAI, please visit or email

For more information, see the Privacy Policy and Terms of Use.

*To learn more about the science and research behind PAI, visit

What's New

Version 2.1.6

Thank you for all your feedback. Below is a list of updates and key fixes in this release.
*Remember to always update your app and SLICE firmware for the best experience.

• Now available in Simplified Chinese!

Customer Reviews

Could be great but...


Quite glitchy. Sometimes the app won't even open and just says syncing, other times it says my slice isn't connected when it is, and when I turn the vibration feature off at night it still vibrates.

Daily issues

Sweet Kansas Faith

Something peculiar seems to go wrong every day. Syncing problems, app freezing, tracker displaying more PAI than app does, PAI decreasing when syncing, etc. Wish it was more reliable, but, as it is, it's hard to trust the data.

Syncing data with server


Constantly freezes on "syncing data with server". The watch works great, but the app is terrible.


Physical Enterprises Inc.
172.3 MB
Health & Fitness
Requires iOS 9.3 or later. Compatible with iPhone, iPad and iPod touch.
English, Russian, Simplified Chinese
Age Rating
Rated 4+
© Mio Global (Physical Enterprises Inc.)


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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