# ZRun vs GravaStar Sirius

The clearest difference is update cadence: ZRun at weekly against GravaStar Sirius's every 2 months. ZRun also leads on rating (3.1 vs 2.7) and review sentiment (36% vs 15%). 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.

ZRun holds the better App Store score, 3.1 against 2.7. That said, the two scores are not equally well evidenced: ZRun has 406 ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 36% of ZRun's written reviews are positive against 15% of GravaStar Sirius's.

ZRun ships an update weekly, GravaStar Sirius every 2 months. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | ZRun | GravaStar Sirius |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (406 ratings)](https://appshunter.io/ios/app/zrun/id6739612986/reviews)** | [2.7 (15 ratings)](https://appshunter.io/ios/app/gravastar-sirius/id6740307538/reviews) |
| Number of ratings | **406** | 15 |
| Positive reviews | **35.7% of reviews** | 15.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | Free | Free |
| Size | 232 MB | 71 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [深圳子俊科技有限公司](https://appshunter.io/developer/1782234380) | [zhuoye chuangyi Co., ltd](https://appshunter.io/developer/1789460886) |

## What reviewers say

### ZRun

[App page](https://appshunter.io/ios/app/zrun/id6739612986)

This app syncs with a smartwatch to display your health data, including steps, distance, and calories burned. It also tracks sleep quality and provides notifications for calls and messages. The application integrates with Apple Health for comprehensive health management.

**Highlights:** Step, distance, and calorie tracking, Sleep quality monitoring, Call and message notifications, Apple Health integration, Syncs with smartwatch

**In-app purchases:** none


### GravaStar Sirius

[App page](https://appshunter.io/ios/app/gravastar-sirius/id6740307538)

This app allows users to customize audio settings, manage noise cancellation, and connect their earbuds. It also provides firmware updates and real-time battery monitoring for a seamless user experience.

**Highlights:** Customizable equalizer settings, Adaptive noise cancellation, Voice assistant integration, Real-time battery monitoring, Firmware updates

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ZRun free?

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

### Is GravaStar Sirius free?

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

### Which has better reviews, ZRun or GravaStar Sirius?

ZRun is rated higher. ZRun averages 3.1 out of 5 from 406 ratings, while GravaStar Sirius averages 2.7 from 15 ratings.

### Do ZRun or GravaStar Sirius have ads?

Neither ZRun nor GravaStar Sirius shows ads.

### Which is updated more often, ZRun or GravaStar Sirius?

ZRun ships an update weekly, and GravaStar Sirius every 2 months. Most recently, ZRun was updated on October 30, 2026 and GravaStar Sirius on October 28, 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.*