# Nostresso — Honest, private stress insight

> Honest, private stress insight (iPhone/iPad app by Michal Komar.)

- Source: https://appshunter.io/ios/app/nostresso/id6752930439 (this page in markdown: same URL + `.md`)
- Developer: [Michal Komar](https://appshunter.io/developer/1802326930)
- Category: Health & Fitness
- Price: Free
- Age rating: 12+
- Requires: iOS 26.0 · 7 MB
- Languages: American English
- Released: 2026-07-09
- Data updated: 2026-07-21
- User reviews in markdown: https://appshunter.io/ios/app/nostresso/id6752930439/reviews.md

## What is Nostresso?

Nostresso turns the heart data your Apple Watch already collects into an honest, personal stress score — computed entirely on your iPhone. No account. No cloud. No subscription.

REAL PHYSIOLOGY, NOT GUESSWORK
Your stress score (0–100) comes from heart rate variability (SDNN) and resting heart rate, normalized against your own baselines for sleep, quiet days, and active days. Nostresso shows you how confident it is in every score instead of pretending to be certain — and it recalibrates itself to your physiology every 48 hours.

ON YOUR WRIST TOO
The Nostresso Watch app gives you the calm glance: your current stress, Body Battery, recovery, and goal progress — right on your watch. Add the Current Stress and Goal Progress complications to your watch face and your day's state is always one glance away.

SEE WHAT ACTUALLY DRIVES YOUR STRESS
Nostresso correlates your stress with real-life factors — sleep, movement, daylight, noise exposure, mindful minutes, caffeine, and alcohol — and surfaces personal takeaways like which factor moves your stress the most. Not generic advice: your data, your patterns.

RECOVER, DON'T JUST MEASURE
Body Battery, recovery status, and sleep quality show whether you have capacity for a demanding day or need to slow down first.

A COACH THAT LIVES ON YOUR PHONE
A short daily insight is generated on-device with Apple Intelligence, grounded in your actual numbers. Set stress, recovery, sleep, or mindfulness goals and get on-device recommendations that adapt to where you are — not where an average user is.

PRIVATE BY ARCHITECTURE
Nostresso has no servers and makes no network connections. Your health data never leaves your iPhone — that is not a policy, it is how the app is built.

WORKS QUIETLY IN THE BACKGROUND
No manual measurements needed. Nostresso processes new Apple Watch readings as they arrive, and can notify you when stress stays elevated — so you can breathe, take a walk, or just close the laptop.

REQUIRES
• iPhone with iOS 26 or later
• Apple Watch (worn day and night for best calibration)
• On-device AI insights require iPhone 15 Pro or newer; a rule-based fallback is included

Nostresso is not a medical device and does not diagnose, treat, or prevent any condition.


## Version history (last 3 releases)

### 1.0.2 — 2026-07-14

Reliability update:

• Your current stress level no longer briefly reverts when Apple Health refines an earlier reading — the Watch and Siri always show the freshest value
• Overnight respiratory data is now preserved when Apple Health revises samples
• One-time cleanup of duplicate measurements for tighter, more personal baselines
• Fresh Apple Watch screenshots and small diagnostics improvements

### 1.0.1 — 2026-07-10

Reliability update:

• Fixed a rare crash during background health updates
• Stress history no longer keeps outdated resting heart rate readings when Apple Watch refines them
• Weekly and monthly trends now follow your calendar week
• Redesigned Apple Watch app and watch-face complications
• HealthKit Access in Profile now opens the Health app directly

### 1.0 — 2026-07-09

No release notes.

## More apps by Michal Komar

- [Starvoxel: Jump](https://appshunter.io/ios/app/starvoxel-jump/id6743340627)
- [Starvoxel: Merge Defender](https://appshunter.io/ios/app/starvoxel-merge-defender/id6755552120)

All apps by Michal Komar: https://appshunter.io/developer/1802326930

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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 2026-07-21.*