# SZOS vs HD Fit Pro

The clearest difference is rating: HD Fit Pro at 3.6 against SZOS's 2.8. HD Fit Pro also leads on ads (none vs shown) and review sentiment (31% vs 6%). On price, ratings volume, update cadence and in-app purchases there is nothing between them.

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

HD Fit Pro holds the better App Store score, 3.6 against 2.8. Both are backed by a comparable volume of ratings — 105 and 116 respectively. Written reviews point the same way: 6% of SZOS's written reviews are positive against 31% of HD Fit Pro's.

SZOS ships an update every 3 weeks, HD Fit Pro fortnightly. The most recent releases landed on September 12, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | SZOS | HD Fit Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.8 (105 ratings)](https://appshunter.io/ios/app/szos/id1543848875/reviews) | **[3.6 (116 ratings)](https://appshunter.io/ios/app/hd-fit-pro/id1601611643/reviews)** |
| Number of ratings | 105 | **116** |
| Positive reviews | 5.6% of reviews | **31.1% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Ad-supported | **Free** |
| Size | 70 MB | 555 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [晟 谷](https://appshunter.io/developer/1543671031) | [Shenzhen Huadafeng Electronics Co., Ltd.](https://appshunter.io/developer/1524150290) |

## What reviewers say

### SZOS

[App page](https://appshunter.io/ios/app/szos/id1543848875)

This app syncs with a smart watch to track your daily activity, including steps, heart rate, and sleep patterns. It provides insights into your health and fitness metrics.

**Highlights:** Step tracking, Heart rate monitoring, Sleep analysis, Syncs with smart watch, Activity mode

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

**In-app purchases:** none


### HD Fit Pro

[App page](https://appshunter.io/ios/app/hd-fit-pro/id1601611643)

This smart health app integrates data and services from Bluetooth wearable devices. It tracks various sports activities and monitors daily health metrics like steps and sleep, helping users manage their physical well-being and build healthy routines.

**Highlights:** Bluetooth wearable device integration, Sports data recording (running, cycling, climbing), Step and sleep monitoring, Health data management, Daily exercise tracking, Healthy routine development

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SZOS free?

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

### Is HD Fit Pro free?

HD Fit Pro is free to download, with no in-app purchases.

### Which has better reviews, SZOS or HD Fit Pro?

HD Fit Pro is rated higher. SZOS averages 2.8 out of 5 from 105 ratings, while HD Fit Pro averages 3.6 from 116 ratings.

### Do SZOS or HD Fit Pro have ads?

SZOS shows ads; HD Fit Pro does not.

### Which is updated more often, SZOS or HD Fit Pro?

SZOS ships an update every 3 weeks, and HD Fit Pro fortnightly. Most recently, SZOS was updated on September 12, 2026 and HD Fit Pro on September 21, 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.*