PowerMaster vs Emerge Power OnSiteMonitor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PowerMaster
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Monitor your UPS and get prompt notification anywhere and anytime! PowerMaster app provides a status overview of your UPS. It enables you to monitor your UPS and supports event notifications to ensure instant event update. PowerMaster app also supports multiple UPS monitoring. You can select a UPS from the UPS List and check its status. Download free PowerMaster app and enjoy the benefits the following features bring: - Monitor Monitor page provides an overview of the UPS current status, including power supplied, voltage supplied, power condition, battery capacity, battery status, estimated runtime and UPS load. Multiple UPS monitoring is also available. - Event log Event log info provides the a list of happened events.
Emerge Power OnSiteMonitor
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App for Data Center Monitoring
Screenshots
Verdict
PowerMaster and Emerge Power OnSiteMonitor are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
PowerMaster ships an update every 4 months, Emerge Power OnSiteMonitor every 3 months. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.
| Parameter | PowerMaster | Emerge Power OnSiteMonitor |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 52 MB | 18 MB |
| Age rating | 17+ | 4+ |
| Developer | Cyber Energy Co., Ltd. | Emerge Power Solutions, LLC |
In-app purchases
PowerMaster
No in-app purchases
Emerge Power OnSiteMonitor
No in-app purchases
Questions
Is PowerMaster free?
Is Emerge Power OnSiteMonitor free?
Do PowerMaster or Emerge Power OnSiteMonitor have ads?
Which is updated more often, PowerMaster or Emerge Power OnSiteMonitor?
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