Run Tracker - Kiiro

VO2 Max, HR Zones & Endurance

Only for iPhone

Free · Designed for iPhone

iPhone

Kiiro – Understand Your Training Not sure if you're training too hard — or not hard enough? Most apps show you data. Kiiro explains what it means. Whether you're building toward a goal or just trying to stay consistent without getting injured, Kiiro tracks your training load, zones, and progress — and tells you what to do about it. AM I TRAINING TOO HARD? See your training load build over time — recent effort vs. long-term fitness. Know when to push and when to rest. No sports science degree required. ‣ Acute vs. chronic training load ‣ Weekly and monthly trends ‣ Clear warnings before you overdo it AM I ACTUALLY IMPROVING? Compare every run on the same route. See your progress in pace, heart rate, and effort — proof that your training is working. ‣ Automatic route matching ‣ Personal records highlighted ‣ Visual charts show trends over time AM I IN THE RIGHT ZONES? Easy runs should be easy. Hard runs should be hard. Kiiro shows exactly how much time you spend in each zone — and whether it matches your goals. ‣ Aerobic vs. anaerobic breakdown ‣ Zone trends over weeks and months ‣ Spot polarized training gaps METRICS THAT MATTER VO2 max trends, resting heart rate, HRV, cadence, ground contact time, detailed splits and maps. GOALS & HISTORY Set targets. Track streaks. Review your full training history with trends and summaries. Syncs automatically with Apple Watch through HealthKit. No manual uploads. No extra hardware. For runners who want to understand their training — not just track it.

Ratings & Reviews

  • 5.0
    out of 5
    2 Ratings

Thanks to everyone who shared feedback and continues to use Kiiro! We’ve been working behind the scenes to improve performance and fix bugs for a smoother experience.

Version 1.1.3

The developer, endurance101 OÜ, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Health & Fitness
    • Location
    • Contact Info
    • User Content
    • Identifiers
    • Usage Data

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Identifiers
    • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

  • Seller
    • endurance101 OU
  • Size
    • 61.4 MB
  • Category
    • Health & Fitness
  • Compatibility
    Requires iOS 18.0 or later.
    • iPhone
      Requires iOS 18.0 or later.
    • Mac
      Requires macOS 15.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.0 or later.
  • Languages
    English and 4 more
    • English, French, German, Russian, Spanish
  • Age Rating
    16+
  • Copyright
    • © endurance101 OÜ
  • Privacy Policy

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