Barberfish extension

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Johannes Weytjens

• March 20, 2026 15:53

Hey Karoo community

I've been building a Karoo extension called Barberfish and just released v1.0. 

It reimplements and enhances a core set of data fields

What it adds:

* 3-column HUD — speed, heart rate, and power side by side in a single row, designed as the top row of a map page
* Zone coloring — background fill or text color, with four palettes: Hammerhead, Wahoo, Zwift, and Intervals.icu
* Average speed with threshold coloring — set a single target pace (goes green/red) or a min/max range (great for ACP randonneuring or paced events)
* Better time formatting — unambiguous across all durations: 1h 23'45", 1:23:45, or 1h 23m 45s

Everything is configurable from the Barberfish app on the Karoo itself, changes update live.

Installation: sideload the APK from the latest release following Hammerhead's standard sideloading instructions.

Full README with screenshots, palette previews, and use cases:
https://github.com/jpweytjens/barberfish

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  basti

  • June 09, 2026 18:06

  Hey Johannes,
  
  Your 3.3.1 update fixed the clipping inside the grade datafield for my german device - thanks :)

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  Frank Fiorentino

  • June 10, 2026 05:58

  Are the new Karoo default climb colors and grade ranges representing in the extension?

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  Johannes Weytjens

  • June 11, 2026 13:24

  Hey Basti, happy that it's fixed! It took me a while to figure out that the issue was related to the locale.

  Hey Frank, yes, v3.3 updated the new climb ranges along side many other any improvements. The full list is here: https://github.com/jpweytjens/Barberfish/blob/master/CHANGELOG.md#33.

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