NEPViewer vs S
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NEPViewer
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.
- Real-time system monitoring
- Track energy harvest
- View installed systems
- Check system performance
- Multi-language support
Read full descriptionHide full description
NEPViewer provides real-time monitoring for BDM micro inverter systems from Northern Electric & Power Inc. (NEP) - End user can easily check on system output and energy harvest - Installer can check a list of systems installed and performance A username and password from https://www.nepviewer.com is required. User of this APP needs to register on the NEPViewer website first. NEPViewer supports multiple languages including English, Spanish, German, French, Portuguese, Polish, Japanese and Chinese.
S
This app streamlines the installation and monitoring of distributed PV power plants. It offers an easy-to-use interface for setting up monitoring accounts and provides visual guidance for microinverter installation. Access plant-level and module-level power generation data, along with detailed alarm information for diagnostics.
- Easy account monitoring
- Visual installation guide
- Rapid account configuration
- Plant-level data
- Module-level data
- Alarm information
Read full descriptionHide full description
S-miles Installer is a mobile application developed by Hoymiles especially for installers of distributed PV power plants. It provides an EASY-TO-USE procedure for monitoring accounts and a visual physical layout guide for the installation of microinverters, which helps installers configure monitoring accounts rapidly, and provides installers power generation data on both plant-level & module-level as well as detailed alarm information about the power plant for commissioning & diagnostics.
Screenshots
Verdict
The clearest difference is review sentiment: S at 66% against NEPViewer's 14%. S also leads on rating (4.2 vs 2.7) and ratings volume (14 vs 3). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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, 4.2 against 2.7. Both are backed by a comparable volume of ratings — 3 and 14 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. The most recent releases landed on September 22, 2026 and September 23, 2026 respectively.
| Parameter | NEPViewer | S |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (3 ratings) | 4.2 (14 ratings) — better |
| Positive reviews | 14.3% of reviews | 65.5% of reviews — better |
| Number of ratings | 3 | 14 — better |
| Update frequency | Every 3 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 62 MB | 208 MB |
| Age rating | 4+ | 4+ |
| Developer | Northern Electric & Power Inc | Hoymiles Power Electronics Inc. |
Customer experience
NEPViewer
S
Bugs and requests
NEPViewer
Reported bugs
12 issues- App closes immediately on launch/login
- Blank error box when resetting password
- App offline frequently
- Inaccurate wattage readings
- Cannot connect to all inverters
Show 7 moreShow fewer
- Serial number error during inverter pairing
- Display issues on iPad (white screen, cut-off content)
- App crashes after iOS updates
- Network anomaly errors
- Login issues after updates
- Data not refreshing or delayed
- App requires daily reinstallation to view data
Requested features
7 requests- Restore panel performance view
- Restore daily/hourly graphs and curves
- Improve iPad/landscape mode support
- Better customer support
- Option to stay logged in
Show 2 moreShow fewer
- More accurate real-time data
- Improve scaling of axes in graphs
S
Not enough reviews yet to summarise bugs or requests.
In-app purchases
NEPViewer
No in-app purchases
S
No in-app purchases
