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
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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
Monitor your distributed PV power plant's performance with real-time data. Track energy generation, view module-level details, and receive equipment alarm notifications to ensure optimal operation and yield.
- Module-level monitoring
- Real-time data display
- Plant-level data
- Energy generation tracking
- Alarm information
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S-miles Enduser is a mobile application developed by Hoymiles especially for owners of distributed PV power plants, which can absorb the operating data of PV power plants from S-miles Cloud. There are more functions, such as module-level monitoring, real-time data display for both plant-level & module-level as well as daily, monthly, annual, and total energy display. Furthermore, you can easily see the alarm information with the equipment, which could assist the owner in monitoring the operation of the PV power plant, ensuring normal operation of the power plant and obtaining of the expected yield.
Screenshots
Verdict
The clearest difference is rating: S at 4.2 against NEPViewer's 2.3. S also leads on review sentiment (37% vs 14%) and ratings volume (90 vs 4). 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 2.3. That said, the two scores are not equally well evidenced: S has 90 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 14% of NEPViewer's written reviews are positive against 37% of S's.
NEPViewer ships an update every 3 weeks, S monthly. The most recent releases landed on October 24, 2026 and October 23, 2026 respectively.
| Parameter | NEPViewer | S |
|---|---|---|
| Price | Free | Free |
| Rating | 2.3 (4 ratings) | 4.2 (90 ratings) — better |
| Positive reviews | 13.8% of reviews | 37.3% of reviews — better |
| Number of ratings | 4 | 90 — 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 | 207 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
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- 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
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- 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
