# Zone Pro: HR Power Pace — Triathlon Training Zones

> Triathlon Training Zones (iPhone/iPad app by Yoshifumi Sato.)

- Source: https://appshunter.io/ios/app/zone-pro-hr-power-pace/id6795739551 (this page in markdown: same URL + `.md`)
- Developer: [Yoshifumi Sato](https://appshunter.io/developer/6780413827)
- Category: Health & Fitness
- Price: $4.99
- Age rating: +4
- Requires: iOS 17.0 · 12 MB
- Languages: American English
- Released: 2026-08-06
- Data updated: 2026-09-06
- User reviews in markdown: https://appshunter.io/ios/app/zone-pro-hr-power-pace/id6795739551/reviews.md

## What is Zone Pro?

Zone Pro is a unified training zone calculator for triathletes and endurance athletes, built around the methods coaches actually use.

Heart rate zones:
- Karvonen method (percent heart rate reserve) from your max and resting heart rate
- LTHR-based 6-zone model from your lactate threshold heart rate

Cycling power zones:
- Classic Coggan 7-zone model from your FTP (Functional Threshold Power)

Running pace zones:
- 5-zone model calculated from your threshold pace, in min/km or min/mile

Swim CSS zones:
- Critical Swim Speed from a 400m or 200m time trial, converted into pace-per-100m training zones

Enter your test numbers once and see every zone, for every discipline, laid out clearly with exact ranges, not vague guesses. Switch calculation methods to match what your coach or training plan uses.

Zone Pro works entirely offline and keeps your data on your device. No account, no subscription, no ads.

This app performs standard, published training-zone calculations for educational and training-planning purposes. It is not a medical device and does not replace advice from a coach or physician.


## Version history (last 2 releases)

### 1.0.1 — 2026-09-03

Stability improvements:

- Your inputs are now saved immediately when you leave the app (previously a quick app switch right after typing could lose the last change)
- Fixed swim CSS zone boundaries so adjacent zones no longer share the same time (Z1/Z2 and Z4/Z5 overlapped by one second)

### 1.0 — 2026-08-06

No release notes.

## More apps by Yoshifumi Sato

- [禁パチS パチンコ・パチスロ断ち日数カウンター](https://appshunter.io/ios/app/s/id6780413825)
- [推し活マネージャー 推しの費用と時間を記録する家計簿](https://appshunter.io/ios/app/id6782066111)
- [通院ノート 頭痛・発作・症状を記録する体調管理](https://appshunter.io/ios/app/id6782272499)
- [四字熟語ステップ](https://appshunter.io/ios/app/id6782533035)
- [こども語録｜子供の名言・言い間違いメモ](https://appshunter.io/ios/app/id6782562338)
- [そなえ費 特別費の積立｜車検・自動車税・固定資産税](https://appshunter.io/ios/app/id6783801899)

All apps by Yoshifumi Sato: https://appshunter.io/developer/6780413827

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-06.*