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 and manage your home energy system with real-time data on energy production, consumption, and battery status. Connect and control your Hoymiles devices remotely to optimize your energy plan and gain insights into your energy usage.
- Connect and control Hoymiles devices
- Real-time energy monitoring
- Home energy system setup
- Historical data analysis
- Monitor energy flow
- Customize energy plans
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S-Miles Home supports Hoymiles plug-in solar and storage devices such as HiBattery, HiFlow. With the S-Miles home APP, you can connect, view, manage and update your Hoymiles DIY products for a wealthier, smarter experience. - Connect and control devices Connect your Hoymiles devices via Bluetooth and WiFi to monitor your devices in real time, anytime, anywhere. - Establish your home energy system. Create your home energy system, so that you can monitor home energy flow and customize a better energy plan. - Historical data analysis S-Miles home provides a wealth of historical data covering photovoltaics, batteries, home consumption and the grid. Your energy world, is in the palm of your hand. Open energy for all is Hoymiles vision, so start your journey with Hoymiles now!
Screenshots
Verdict
The clearest difference is review sentiment: S at 89% against NEPViewer's 14%. NEPViewer's advantage is rating (2.0 vs 1.0). On price, ratings volume, update cadence and ads 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.
NEPViewer holds the better App Store score, 2.0 against 1.0. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews complicate that: 14% of NEPViewer's written reviews are positive against 89% of S's, so the app with the better star average is not the one people write more warmly about.
NEPViewer ships an update every 3 weeks, S monthly. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.
| Parameter | NEPViewer | S |
|---|---|---|
| Price | Free | Free |
| Rating | 2.0 (5 ratings) — better | 1.0 (2 ratings) |
| Positive reviews | 13.8% of reviews | 89.3% of reviews — better |
| Number of ratings | 5 — better | 2 |
| 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 — better | 15.6 |
| Further details — not scored | ||
| Size | 62 MB | 193 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
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
