# NEPViewer vs Z

The clearest difference is rating: Z at 5.0 against NEPViewer's 2.3. Z also leads on review sentiment (33% vs 14%) and iOS requirement (13.0 vs 15.0). On price, ratings volume, update cadence and ads there is nothing between them.

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

Z holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews point the same way: 14% of NEPViewer's written reviews are positive against 33% of Z's.

NEPViewer ships an update every 3 weeks, Z monthly. Both last shipped on October 20, 2026.

## The numbers

| Metric | NEPViewer | Z |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (4 ratings)](https://appshunter.io/ios/app/nepviewer/id1480269247/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/z-box/id1578050504/reviews)** |
| Number of ratings | **4** | 3 |
| Positive reviews | 13.8% of reviews | **33.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free | Free |
| Size | 62 MB | 36 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Northern Electric & Power Inc](https://appshunter.io/developer/1202736933) | [zhejiang benyi new energy technology co.,ltd.](https://appshunter.io/developer/1536090136) |

## What reviewers say

### NEPViewer

[App page](https://appshunter.io/ios/app/nepviewer/id1480269247)

Monitor your BDM micro inverter system in real-time. Track system output and energy harvest, or view installed systems and their performance. Requires registration on the NEPViewer website.

**Highlights:** Real-time system monitoring, Track energy harvest, View installed systems, Check system performance, Multi-language support

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

**In-app purchases:** none

**What reviewers like**

- 👍 Intuitive and easy to use (some users)
- ✨ Modern look and feel (some users)
- ✅ App does what it's supposed to (sometimes)

**What reviewers complain about**

- 🐛 Frequent crashes and closing
- ❌ Login and password reset issues
- 📉 Inaccurate or delayed data
- 🚫 Loss of important features (panel view, daily graphs)
- 🖥️ Poor iPad/landscape support

**Reported bugs**

- App closes immediately on launch/login
- Blank error box when resetting password
- App offline frequently
- Inaccurate wattage readings
- Cannot connect to all inverters

**Requested features**

- Restore panel performance view
- Restore daily/hourly graphs and curves
- Improve iPad/landscape mode support
- Better customer support
- Option to stay logged in


### Z

[App page](https://appshunter.io/ios/app/z-box/id1578050504)

Manage and monitor your smart home energy devices remotely. Connect to EV chargers and microinverters via Bluetooth or Wi-Fi for real-time status updates and control. Compatible with BENY home chargers and balcony/garden PV equipment.

**Highlights:** Remote EV charger monitoring, Microinverter status viewing, Bluetooth direct connection, Wi-Fi cloud registration, Real-time device status, BENY device compatibility

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

**In-app purchases:** none


## Frequently asked questions

### Is NEPViewer free?

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

### Is Z free?

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

### Which has better reviews, NEPViewer or Z?

Z is rated higher. NEPViewer averages 2.3 out of 5 from 4 ratings, while Z averages 5.0 from 3 ratings.

### Do NEPViewer or Z have ads?

Neither NEPViewer nor Z shows ads.

### Which is updated more often, NEPViewer or Z?

NEPViewer ships an update every 3 weeks, and Z monthly. Most recently, NEPViewer was updated on October 20, 2026 and Z on October 20, 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.*