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Added August 14, 2026

Underdog — Turn heart rate zone minutes into weekly league points

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About the product

Underdog is an iPhone app that turns time spent in heart rate zones into a weekly competition. It reads heart rate and workout data from Apple Health, recorded by an Apple Watch, chest strap, or other connected sensor, so nothing is logged by hand. Every minute in zones Z1 to Z5 earns points, and higher zones score more. Scoring uses heart rate as a percentage of a personal maximum, so different ages and fitness levels can score the same. Points feed weekly leagues from Bronze to Diamond, with promotion, relegation, and a weekly reset. Private leagues use an invite code. Free on the App Store, with no ads.
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Monthly promotion

$14USD per month

Card, Apple Pay and more, through Whop. Starts straight away.

  • Cancel any time from the Whop account you paid with, or email [email protected] and we will do it.
  • The promotion starts straight away, no waiting on us.
  • Whop handles the checkout. We never see your card.

Questions first? Email [email protected].

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