# MQTTAnalyzer vs SEM

The clearest difference is rating: MQTTAnalyzer at 4.5 against SEM's 3.4. MQTTAnalyzer also leads on review sentiment (78% vs 38%) and update cadence (every 5 days vs every 2 weeks). SEM's advantage is iOS requirement (15.6 vs 18.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

MQTTAnalyzer holds the better App Store score, 4.5 against 3.4. Both are backed by a comparable volume of ratings — 22 and 11 respectively. Written reviews point the same way: 78% of MQTTAnalyzer's written reviews are positive against 38% of SEM's.

MQTTAnalyzer ships an update every 5 days, SEM every 2 weeks. The most recent releases landed on September 21, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | MQTTAnalyzer | SEM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (22 ratings)](https://appshunter.io/ios/app/mqttanalyzer/id1493015317/reviews)** | [3.4 (11 ratings)](https://appshunter.io/ios/app/sem-meter/id6468902139/reviews) |
| Number of ratings | **22** | 11 |
| Positive reviews | **77.8% of reviews** | 37.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 2 weeks |
| Monetization | Free | Free |
| Size | 12 MB | 31 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Philipp Arndt](https://appshunter.io/developer/1493015316) | [Hangzhou Dashi Wisdom Technology Co., Ltd.](https://appshunter.io/developer/1822219570) |

## What reviewers say

### MQTTAnalyzer

[App page](https://appshunter.io/ios/app/mqttanalyzer/id1493015317)

Monitor and debug MQTT brokers on your Apple devices. Visualize data with hierarchical views, JSON highlighting, and charts. Publish messages, manage multiple brokers, and sync settings across devices. Free and open source.

**Highlights:** MQTT 3.1.1 and 5.0 support, JSON highlighting and pretty-printing, Time series charts for numeric values, Connect to multiple brokers, Full-text search, Publish messages, iCloud sync

**Features:** Vision Pro support

**In-app purchases:** none


### SEM

[App page](https://appshunter.io/ios/app/sem-meter/id6468902139)

This utility app monitors your household power consumption in real-time, providing historical data and comparisons to help you save on electricity bills. It supports managing multiple devices and customizing electricity fee calculations.

**Highlights:** Real-time power usage monitoring, Historical energy use tracking, Second-to-second, day-to-day, week-to-week, month-to-month, and year-to-year comparisons, Electricity fee gradient calculation, Customizable fee templates, Multiple device management

**In-app purchases:** none


## Frequently asked questions

### Is MQTTAnalyzer free?

MQTTAnalyzer is free to download, with no in-app purchases.

### Is SEM free?

SEM is free to download, with no in-app purchases.

### Which has better reviews, MQTTAnalyzer or SEM?

MQTTAnalyzer is rated higher. MQTTAnalyzer averages 4.5 out of 5 from 22 ratings, while SEM averages 3.4 from 11 ratings.

### Do MQTTAnalyzer or SEM have ads?

Neither MQTTAnalyzer nor SEM shows ads.

### Which is updated more often, MQTTAnalyzer or SEM?

MQTTAnalyzer ships an update every 5 days, and SEM every 2 weeks. Most recently, MQTTAnalyzer was updated on September 21, 2026 and SEM on October 2, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*