NEPViewer vs SEMS+
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.
SEMS+
This platform provides comprehensive energy system management for GoodWe devices. It offers real-time monitoring, energy flow visualization, and AI-driven health guidance. Users can remotely operate systems, receive smart alerts, and integrate multiple devices for efficient energy management and performance optimization.
- Real-time system and device monitoring
- Energy flow visualization
- AI health expert guidance
- Remote operation
- Smart alerts
- Multi-device integration
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GoodWe SEMS+ App is a global digital energy management platform built on GoodWe devices. It delivers real-time system and device monitoring, energy flow visualization, AI health expert guidance, remote operation, smart alerts, multi-device integration, and quick setup, helping installers and end-users efficiently manage energy systems, optimize performance, and maximize returns.
Screenshots
Verdict
NEPViewer and SEMS+ both sit at 2.3 stars, but that hides the real split: 25% of SEMS+'s written reviews are positive against 14% of NEPViewer's. SEMS+ also leads on update cadence (every 8 days vs every 3 weeks) and ratings volume (12 vs 4). On price, rating, 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.
On the App Store both sit at effectively the same score — 2.3 for NEPViewer against 2.4 for SEMS+. Both are backed by a comparable volume of ratings — 4 and 12 respectively. Written reviews are what separate them: 14% of NEPViewer's written reviews are positive against 25% of SEMS+'s.
NEPViewer ships an update every 3 weeks, SEMS+ every 8 days. The most recent releases landed on October 15, 2026 and October 16, 2026 respectively.
| Parameter | NEPViewer | SEMS+ |
|---|---|---|
| Price | Free | Free |
| Rating | 2.3 (4 ratings) | 2.4 (12 ratings) — better |
| Positive reviews | 14.0% of reviews | 25.0% of reviews — better |
| Number of ratings | 4 | 12 — better |
| Update frequency | Every 3 weeks | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 62 MB | 271 MB |
| Age rating | 4+ | 4+ |
| Developer | Northern Electric & Power Inc | GoodWe Technologies Co., Ltd. |
Customer experience
NEPViewer
SEMS+
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
SEMS+
Not enough reviews yet to summarise bugs or requests.
In-app purchases
NEPViewer
No in-app purchases
SEMS+
No in-app purchases
