# MQTTInspector

> MQTT broker monitor for subscribing to topics and publishing payloads. (iPhone/iPad app by Christoph Krey.)

- Source: https://appshunter.io/ios/app/mqttinspector/id758868884 (this page in markdown: same URL + `.md`)
- Developer: [Christoph Krey](https://appshunter.io/developer/692424694)
- Category: Utilities, Productivity
- Price: $1.99
- Rating: 3.30/5 from 8 App Store ratings · 6 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.2 · 3 MB
- Languages: American English
- Released: 2013-11-25
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/mqttinspector/id758868884/reviews.md

## What is MQTTInspector?

The idea is to have a monitor app with which you can connect to an MQTT broker, subscribe to a number of topics and publish a text payload to a topic or two for debugging purposes.

The result is a pretty versatile utility for your MQTT toolchest. It serves as a viewer with which you can observe payloads being published to topics you're interested in, and you can publish payloads to topics at the tap of a button. The app is designed to work on both iPad and iPhone.

## Key features

- Connect to MQTT brokers
- Subscribe to topics
- Publish text payloads
- Observe message payloads
- Debug MQTT communication
- iPad and iPhone support

## Recent user reviews (6 of 6)

All indexed reviews: https://appshunter.io/ios/app/mqttinspector/id758868884/reviews.md

### 1/5 — Not intuitive

*2020-02-01, version 5.0.5*

Could not get this to work. The interface is not intuitive.  Don’t waste $2

### 1/5 — Completely unintuitive

*2019-02-16, version 5.0.5*

Trial and error attempting to set up. Not at all clear how to do anything. For example, establishing a new session, not clear as to how to connect, when connected or not, why would not connect. Setting up a sub counterintuitive. Extremely poor UI. Very disappointed, waste of my two buck, but moreover a waste of time!

### 1/5 — Promising but confusing and unstable

*2016-01-09, version 1.72*

Was not able to get this to work.  It looks like there are lots of options, and the scope is ambitious, but it crashed and lost my configuration three times in the first five minutes.  I went with another option that doesn't have all the apparent features, but it works.  I would ask for a refund for this app unless it gets fixed.  Usability is also in need of a lot of inprovement.

### 1/5 — No manual?

*2015-06-10, version 1.6*

This app is not intuitive and doesnt have a manual. I dont recommend wasting your $2

### 5/5 — Works well

*2015-02-02, version 1.5.1*

Program works well. The only thing I would love is to be able to have the publish buttons allow me to enter arbitrary numbers. This helps if, for example, you want to change a temperature setting.

### 5/5 — Nice

*2014-06-18, version 1.5.1*

This is a very helpful tool if you are working with mqtt. Quick to set up and the display gives a lot of information in the small iPhone screen.

## Frequently asked questions about MQTTInspector

### What is MQTTInspector used for?

MQTTInspector is a utility app designed to connect to MQTT brokers, subscribe to various topics, and publish text payloads. It's primarily used for debugging MQTT communication by allowing users to monitor message traffic and send test messages.

### How much does MQTTInspector cost?

MQTTInspector is a paid application, available for a one-time purchase of $1.99. This price grants you access to all its features for debugging and monitoring MQTT brokers.

### What devices does MQTTInspector support?

MQTTInspector is designed to work on both iPhone and iPad devices. It also supports iPod touch, offering a versatile tool for a range of Apple mobile devices.

### When was MQTTInspector last updated?

The latest version of MQTTInspector, 13.1.4, was released on February 17, 2020. While the app has been available since 2013, this indicates its last known update.

### What is the age rating for MQTTInspector?

MQTTInspector has an age rating of 4+. This indicates it is suitable for users of all ages, with no content restrictions typically found in more mature applications.

### How does MQTTInspector compare to other MQTT clients?

MQTTInspector focuses specifically on monitoring and debugging, offering features to subscribe to topics and publish payloads for testing. Its utility lies in its straightforward approach to observing and interacting with MQTT broker traffic.

### Is MQTTInspector suitable for beginners in IoT?

Yes, MQTTInspector can be a valuable tool for beginners learning about IoT and MQTT. Its ability to visualize message flows and test publishing helps in understanding how MQTT works in practice.

## Version history (last 5 releases)

### 13.1.4 — 2020-02-17

The new version of the app requires iOS 13.

### 13.1.3 — 2020-02-15

A number of bug and stability fixes
Network code based on NSURLSession allows native Websocket support

### 5.0.5 — 2018-07-27

Bugfixes MQTTv5 tested with pahotest, vernemq, hivemq

### 5.0.4 — 2018-05-01

Fehlerbehebungen:
[FIX] broker response to a PUBLISH with QoS1 or QoS2 might be rejected

### 5.0.3 — 2018-01-05

MQTT 5.0 compatible

The following new features are added to MQTT v5.0 and are supported by MQTTInspector
·         Session expiry
·         Message expiry
·         Reason code on all ACKs
·         Reason string on all ACKs
·         Server disconnect
·         Payload format and content type
·         Request / Response
·         Shared Subscriptions
·         Subscription ID
·         Topic Alias
·         Flow control
·         User properties
·         Maximum Packet Size
·         Optional Server feature availability
·         (Enhanced authentication)
·         Subscription options
·         Will delay
·         Server Keep Alive
·         Assigned ClientID
·         Server reference

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## More apps by Christoph Krey

- [OwnTracks](https://appshunter.io/ios/app/owntracks/id692424691)
- [iEmdr](https://appshunter.io/ios/app/iemdr/id695977516)

All apps by Christoph Krey: https://appshunter.io/developer/692424694

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*