# UGREEN NAS vs Sierro

The clearest difference is rating: UGREEN NAS at 4.1 against Sierro's 2.3. UGREEN NAS also leads on ratings volume (315 vs 3). Sierro's advantage is update cadence (every 10 days vs monthly). On price, review sentiment, ads 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.

UGREEN NAS holds the better App Store score, 4.1 against 2.3. That said, the two scores are not equally well evidenced: UGREEN NAS has 315 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 53% of UGREEN NAS's written reviews are positive against 50% of Sierro's.

UGREEN NAS ships an update monthly, Sierro every 10 days. The most recent releases landed on October 25, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | UGREEN NAS | Sierro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (315 ratings)](https://appshunter.io/ios/app/ugreen-nas/id6458647408/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/sierro/id6808530922/reviews) |
| Number of ratings | **315** | 3 |
| Positive reviews | **53.2% of reviews** | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 10 days** |
| Monetization | Free | Free |
| Size | 725 MB | 7 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod, Apple TV** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [深圳市绿联科技股份有限公司](https://appshunter.io/developer/1489890545) | [Sierro Intelligent Technology Co., Ltd](https://appshunter.io/developer/6808530924) |

## What reviewers say

### UGREEN NAS

[App page](https://appshunter.io/ios/app/ugreen-nas/id6458647408)

Manage your personal data across devices with this application for a UGOS Pro system. It offers comprehensive control over user access, hardware, network, and file services. Organize and access your files, photos, and media libraries efficiently with advanced features and security.

**Highlights:** User and access permission management, Hardware and network configuration, Multiple storage modes (RAID, JBOD), Intelligent file filtering and sharing, Photo and video album creation, Automated media library poster walls, Integrated virus scanning

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

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Fast and responsive
- 💡 Frequent updates and improvements
- 🔒 Secure remote access
- 🔥 Great value for money

**What reviewers complain about**

- 🐛 Connectivity issues
- 🔋 Battery drain problems
- 🤔 Unintuitive user interface
- 🌐 Limited language support
- 🔍 Lacking advanced features

**Reported bugs**

- Crashes when uploading large files
- Sync issues causing data loss
- Remote access not working as expected
- Incompatibility with certain devices/OSes
- Media player bugs (audio/video desync, choppy playback)

**Requested features**

- Dedicated photo/video viewer app for Apple TV
- Ability to edit metadata for media files
- Integration with Files app for seamless storage
- Dark mode option
- Improved media playback performance


### Sierro

[App page](https://appshunter.io/ios/app/sierro/id6808530922)

Monitor and manage your home energy storage system. View battery status, solar generation, and power flow. Receive alerts for power outages and low battery levels to stay informed.

**Highlights:** Monitor battery status, View solar generation, Track power flow, Receive device alerts, Get outage notifications, Low battery alerts

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

**In-app purchases:** none


## Frequently asked questions

### Is UGREEN NAS free?

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

### Is Sierro free?

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

### Which has better reviews, UGREEN NAS or Sierro?

UGREEN NAS is rated higher. UGREEN NAS averages 4.1 out of 5 from 315 ratings, while Sierro averages 2.3 from 3 ratings.

### Do UGREEN NAS or Sierro have ads?

Neither UGREEN NAS nor Sierro shows ads.

### Which is updated more often, UGREEN NAS or Sierro?

UGREEN NAS ships an update monthly, and Sierro every 10 days. Most recently, UGREEN NAS was updated on October 25, 2026 and Sierro on October 26, 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.*