Heart and Power Zone Colours

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Marcus Mason

• February 28, 2025 15:41
• Edited

Dear Hammerhead Team,

 

I hope this message finds you well. I am writing to request a change in the KAROO 3 heart and power settings to align with the color schemes used by many indoor training applications, including Zwift, and to match the industry standard currently adopted by Garmin and most other fitness manufacturers.

 

It would also help distinguish the zones easier. For example currently the first two KAROO zones are both Green.

 

Specifically, I would like to see the following changes for each zone:

 

**Heart Rate & Power Zones:**

Zone 1: Grey to Blue

Zone 2: Blue to Green

Zone 3: Green to Yellow

Zone 4: Yellow to Orange

Zone 5: Orange to Red

Zone 6: Red to Purple

 

These changes will help ensure consistency across various training platforms and enhance the user experience for all KAROO 3 users.

 

I understand some users may prefer the current colour setup, however I would be intrigued to know how many would prefer the Standard I have suggested.

 

Thank you for considering this request. I look forward to your positive response.

 

Best regards, Marcus

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  Simon Lockwood

  • February 28, 2025 11:01

  It's a good suggestion and something i miss from wahoo.

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  Akhil

  • February 28, 2025 14:08

  Hi Marcus,

  Thanks for posting your suggestion around the colors used for the HR & power zones. Our team is certainly working towards improving the UI on the Karoo OS. I have ensured to share your suggestion here with the product team for their reference and consideration.  

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  Simon Lockwood

  • March 06, 2025 21:10

  In latest FW release!! Thanks

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  Marcus Mason

  • March 07, 2025 19:18

  Hi Simon,

  The latest update makes several huge improvements to the UI. However the Colours for HRM and Power remain unchanged. Please see below for detail. Hopefully HH will change downstream (their team seem extremely good at improving the UI of late):

  Introducing new color data fields for Power and Heart rate. In the new consolidated data field picker menu, you will now see a ‘Zone Color’ option. The background of the data field will show the color of the current zone you are in. This also works for all power smoothing options (e.g. 3s, 30s power).

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  Vinapp

  • March 08, 2025 15:02

  Vin HkE allows customize power and heart rate zones with zwift or hammerhead color chart. This is our continous graph for power and hear rate.

  https://www.instagram.com/p/DG79ZH2sRwD/

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  Jeremy Fields

  • September 30, 2025 21:12

  I really like the zone color backgrounds, but find that in some zones where the background is a darker color and the power number is black, there isn't enough contrast to read the number. I'd like to propose using the accessibility standard of 4.5:1 (or maybe even 7:1 for this use case, which reaches the AAA standard) contrast ratio as a guide for when to flip from black text to white, depending on the background color. There are a bunch of handy tools online to check, like https://webaim.org/resources/contrastchecker/

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