# HemiPhysioData vs Chronographer

The clearest difference is review sentiment: HemiPhysioData at 100% against Chronographer's 50%. HemiPhysioData also leads on iOS requirement (13.2 vs 18.6). Chronographer's advantage is update cadence (every 2 months vs every 18 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

HemiPhysioData ships an update every 18 months, Chronographer every 2 months. The most recent releases landed on June 4, 2026 and August 9, 2026 respectively.

## The numbers

| Metric | HemiPhysioData | Chronographer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (4 ratings)](https://appshunter.io/ios/app/chronographer/id6448242917/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 2 MB | 3 MB |
| Requires iOS | **13.2** | 18.6 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Moez ur Rehman](https://appshunter.io/developer/1502416676) | [Robert France](https://appshunter.io/developer/1684138105) |

## What reviewers say

### HemiPhysioData

[App page](https://appshunter.io/ios/app/hemiphysiodata/id1502983547)

This app collects raw and processed sensor data from your Apple Watch, including accelerometer and gyroscope readings. It allows you to select activities, preferences, and then exports the data as a CSV file to your iPhone for analysis. Ideal for tracking movement and Range of Motion (ROM) measurements.

**Highlights:** Collects raw and processed sensor data, User-friendly activity selection, Exports data as CSV files, Supports accelerometer and gyroscope, Configurable sampling rate, Haptic feedback for logging alerts

**In-app purchases:** none


### Chronographer

[App page](https://appshunter.io/ios/app/chronographer/id6448242917)

This app helps you meticulously track the accuracy of your mechanical watches. It records time differences, calculates detailed performance metrics, and visualizes trends with charts and histograms. You can also manage your watch collection, log daily wear, and analyze positional variations.

**Highlights:** Track mechanical watch accuracy, Calculate detailed performance metrics, Visualize accuracy with charts and histograms, Manage watch collection with notes and photos, Log daily watch wear, Analyze positional variation, Export watch data

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is HemiPhysioData free?

HemiPhysioData is free to download, with no in-app purchases.

### Is Chronographer free?

Chronographer is free to download, with no in-app purchases.

### Do HemiPhysioData or Chronographer have ads?

Neither HemiPhysioData nor Chronographer shows ads.

### Which is updated more often, HemiPhysioData or Chronographer?

HemiPhysioData ships an update every 18 months, and Chronographer every 2 months. Most recently, HemiPhysioData was updated on June 4, 2026 and Chronographer on August 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*