# CardialOS: Heart & Recovery — Honest cardio recovery & load

> Honest cardio recovery & load (iPhone/iPad app by TheTinyApp.)

- Source: https://appshunter.io/ios/app/cardialos-heart-and-recovery/id6778513012 (this page in markdown: same URL + `.md`)
- Developer: [TheTinyApp](https://appshunter.io/developer/1896715202)
- Category: Health & Fitness, Sports
- Price: Free
- Age rating: 4+
- Requires: iOS 14.0 · 51 MB
- Languages: American English
- Released: 2026-06-17
- Data updated: 2026-07-27
- User reviews in markdown: https://appshunter.io/ios/app/cardialos-heart-and-recovery/id6778513012/reviews.md

## What is CardialOS?

CardialOS reads the biometrics your Apple Watch already records — heart-rate variability, resting heart rate, VO₂max, sleep, and your workouts — and turns them into a clear, honest picture of your cardiovascular recovery, training load, and fitness.

No hype, no vanity scores. Just a straight read on how your heart and body are adapting, so you can train with intent and recover on purpose.

WHAT CardialOS SHOWS YOU
  • Recovery — a daily read built from HRV, resting heart rate, and sleep.
  • Training load — acute vs. chronic load and your acute:chronic ratio, so you build fitness without digging a
  hole.
  • Strain & stress — how hard a day asked of you, and how your body is carrying it.
  • Cardio fitness — VO₂max trends, a heart-rate-to-VO₂ view, and a race-time predictor.
  • Heart-rate zones & training distribution — where your time actually goes across easy, threshold, and hard.
  • Workouts — per-session detail with heart-rate drift (decoupling) and efficiency.
  • Vitals — HRV, resting heart rate, respiratory rate, blood oxygen, wrist temperature, and sleep, with trends.
  • Cardiovascular age — how your fitness compares to your years.

HONEST, SUPPORTIVE GUIDANCE
CardialOS's voice is plain and kind. On a hard day it tells you to hold steady and protect your sleep — not that you're crushing it. The goal is a read you can trust over months, not a dopamine hit.

YOUR DATA STAYS ON YOUR DEVICE
CardialOS reads from Apple Health and does its calculations on your device. Your health data is never sent to a server — there's no account and no sign-in. (Anonymous usage and crash diagnostics help us fix bugs — never your health values. See our Privacy Policy.)

BEST WITH AN APPLE WATCH
CardialOS works with the heart-rate, HRV, sleep, VO₂max, and workout data your Apple Watch writes to Apple Health. The more your Watch records, the richer your picture.

CardialOS is a personal fitness and wellness tool. It is not a medical device and does not diagnose, treat, cure, or prevent any condition. Always consult a qualified professional about your health.


## Version history (last 4 releases)

### 0.1.3 — 2026-07-06

CardialOS reads the biometrics your Apple Watch already records — heart-rate variability, resting heart rate, VO₂max, sleep, and your workouts — and turns them into a clear, honest picture of your cardiovascular recovery, training load, and fitness.

No hype, no vanity scores. Just a straight read on how your heart and body are adapting, so you can train with intent and recover on purpose.

WHAT CardialOS SHOWS YOU
  • Recovery — a daily read built from HRV, resting heart rate, and sleep.
  • Training load — acute vs. chronic load and your acute:chronic ratio, so you build fitness without digging a
  hole.
  • Strain & stress — how hard a day asked of you, and how your body is carrying it.
  • Cardio fitness — VO₂max trends, a heart-rate-to-VO₂ view, and a race-time predictor.
  • Heart-rate zones & training distribution — where your time actually goes across easy, threshold, and hard.
  • Workouts — per-session detail with heart-rate drift (decoupling) and efficiency.
  • Vitals — HRV, resting heart rate, respiratory rate, blood oxygen, wrist temperature, and sleep, with trends.
  • Cardiovascular age — how your fitness compares to your years.

HONEST, SUPPORTIVE GUIDANCE
CardialOS's voice is plain and kind. On a hard day it tells you to hold steady and protect your sleep — not that you're crushing it. The goal is a read you can trust over months, not a dopamine hit.

YOUR DATA STAYS ON YOUR DEVICE
CardialOS reads from Apple Health and does its calculations on your device. Your health data is never sent to a server — there's no account and no sign-in. (Anonymous usage and crash diagnostics help us fix bugs — never your health values. See our Privacy Policy.)

BEST WITH AN APPLE WATCH
CardialOS works with the heart-rate, HRV, sleep, VO₂max, and workout data your Apple Watch writes to Apple Health. The more your Watch records, the richer your picture.

CardialOS is a personal fitness and wellness tool. It is not a medical device and does not diagnose, treat, cure, or prevent any condition. Always consult a qualified professional about your health.

### 0.1.2 — 2026-07-01

CardialOS reads the biometrics your Apple Watch already records — heart-rate variability, resting heart rate, VO₂max, sleep, and your workouts — and turns them into a clear, honest picture of your cardiovascular recovery, training load, and fitness.

No hype, no vanity scores. Just a straight read on how your heart and body are adapting, so you can train with intent and recover on purpose.

WHAT CardialOS SHOWS YOU
  • Recovery — a daily read built from HRV, resting heart rate, and sleep.
  • Training load — acute vs. chronic load and your acute:chronic ratio, so you build fitness without digging a
  hole.
  • Strain & stress — how hard a day asked of you, and how your body is carrying it.
  • Cardio fitness — VO₂max trends, a heart-rate-to-VO₂ view, and a race-time predictor.
  • Heart-rate zones & training distribution — where your time actually goes across easy, threshold, and hard.
  • Workouts — per-session detail with heart-rate drift (decoupling) and efficiency.
  • Vitals — HRV, resting heart rate, respiratory rate, blood oxygen, wrist temperature, and sleep, with trends.
  • Cardiovascular age — how your fitness compares to your years.

HONEST, SUPPORTIVE GUIDANCE
CardialOS's voice is plain and kind. On a hard day it tells you to hold steady and protect your sleep — not that you're crushing it. The goal is a read you can trust over months, not a dopamine hit.

YOUR DATA STAYS ON YOUR DEVICE
CardialOS reads from Apple Health and does its calculations on your device. Your health data is never sent to a server — there's no account and no sign-in. (Anonymous usage and crash diagnostics help us fix bugs — never your health values. See our Privacy Policy.)

BEST WITH AN APPLE WATCH
CardialOS works with the heart-rate, HRV, sleep, VO₂max, and workout data your Apple Watch writes to Apple Health. The more your Watch records, the richer your picture.

CardialOS is a personal fitness and wellness tool. It is not a medical device and does not diagnose, treat, cure, or prevent any condition. Always consult a qualified professional about your health.

### 0.1.1 — 2026-06-23

CardialOS reads the biometrics your Apple Watch already records — heart-rate variability, resting heart rate, VO₂max, sleep, and your workouts — and turns them into a clear, honest picture of your cardiovascular recovery, training load, and fitness.

No hype, no vanity scores. Just a straight read on how your heart and body are adapting, so you can train with intent and recover on purpose.

WHAT CardialOS SHOWS YOU
  • Recovery — a daily read built from HRV, resting heart rate, and sleep.
  • Training load — acute vs. chronic load and your acute:chronic ratio, so you build fitness without digging a
  hole.
  • Strain & stress — how hard a day asked of you, and how your body is carrying it.
  • Cardio fitness — VO₂max trends, a heart-rate-to-VO₂ view, and a race-time predictor.
  • Heart-rate zones & training distribution — where your time actually goes across easy, threshold, and hard.
  • Workouts — per-session detail with heart-rate drift (decoupling) and efficiency.
  • Vitals — HRV, resting heart rate, respiratory rate, blood oxygen, wrist temperature, and sleep, with trends.
  • Cardiovascular age — how your fitness compares to your years.

HONEST, SUPPORTIVE GUIDANCE
CardialOS's voice is plain and kind. On a hard day it tells you to hold steady and protect your sleep — not that you're crushing it. The goal is a read you can trust over months, not a dopamine hit.

YOUR DATA STAYS ON YOUR DEVICE
CardialOS reads from Apple Health and does its calculations on your device. Your health data is never sent to a server — there's no account and no sign-in. (Anonymous usage and crash diagnostics help us fix bugs — never your health values. See our Privacy Policy.)

BEST WITH AN APPLE WATCH
CardialOS works with the heart-rate, HRV, sleep, VO₂max, and workout data your Apple Watch writes to Apple Health. The more your Watch records, the richer your picture.

CardialOS is a personal fitness and wellness tool. It is not a medical device and does not diagnose, treat, cure, or prevent any condition. Always consult a qualified professional about your health.

### 1.0 — 2026-06-18

No release notes.

## More apps by TheTinyApp

- [Simple To-Do List & Tasks](https://appshunter.io/ios/app/simple-to-do-list-and-tasks/id6784966465)

All apps by TheTinyApp: https://appshunter.io/developer/1896715202

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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 2026-07-27.*