# NEPViewer vs S

The clearest difference is review sentiment: S at 66% against NEPViewer's 14%. S also leads on rating (4.3 vs 2.0) and ratings volume (15 vs 5). On price, update cadence, 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.

S holds the better App Store score, 4.3 against 2.0. Both are backed by a comparable volume of ratings — 5 and 15 respectively. Written reviews point the same way: 14% of NEPViewer's written reviews are positive against 66% of S's.

NEPViewer ships an update every 3 weeks, S monthly. Both last shipped on November 3, 2026.

## The numbers

| Metric | NEPViewer | S |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (5 ratings)](https://appshunter.io/ios/app/nepviewer/id1480269247/reviews) | **[4.3 (15 ratings)](https://appshunter.io/ios/app/s-miles-installer/id1544207772/reviews)** |
| Number of ratings | 5 | **15** |
| Positive reviews | 13.8% of reviews | **65.8% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Free | Free |
| Size | 62 MB | 224 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Northern Electric & Power Inc](https://appshunter.io/developer/1202736933) | [Hoymiles Power Electronics Inc.](https://appshunter.io/developer/1219594358) |

## 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


### S

[App page](https://appshunter.io/ios/app/s-miles-installer/id1544207772)

This app helps installers of distributed PV power plants manage accounts and provides visual guides for microinverter installation. It offers rapid configuration, power generation data, and detailed alarm information for commissioning and diagnostics.

**Highlights:** Account monitoring, Visual installation guide, Microinverter configuration, Power generation data, Module-level data, Alarm information, Commissioning & diagnostics

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is NEPViewer free?

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

### Is S free?

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

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

S is rated higher. NEPViewer averages 2.0 out of 5 from 5 ratings, while S averages 4.3 from 15 ratings.

### Do NEPViewer or S have ads?

Neither NEPViewer nor S shows ads.

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

NEPViewer ships an update every 3 weeks, and S monthly. Most recently, NEPViewer was updated on November 3, 2026 and S on November 3, 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.*