# MQTT Loupe — Inspect your MQTT traffic

> Utility to inspect MQTT messages on a broker with search and payload viewing. (iPhone/iPad app by Jakob Bieling.)

- Source: https://appshunter.io/ios/app/mqtt-loupe/id1617148458 (this page in markdown: same URL + `.md`)
- Developer: [Jakob Bieling](https://appshunter.io/developer/1617148460)
- Category: Utilities, Developer Tools
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 6 MB
- Languages: English
- Released: 2022-04-05
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/mqtt-loupe/id1617148458/reviews.md

## What is MQTT Loupe?

MQTT Loupe is an intuitive utility to inspect MQTT messages exchanged on an MQTT broker. Connect to any public or local MQTT broker, subscribe to topics and view details of messages being transmitted.

Don't remember that one message or topic? Fire up the search to find it instantly using full-text search through all topics, and results updating live with new hits appearing as they arrive.

With built-in JSON highlighting, this app is perfect for monitoring Zigbee2Mqtt. And if you need to work with binary message payloads, the built-in hex viewer has you covered. Got frequently used topics that are further down the hierarchy? Make them favorites for easy and instant access.

Concerned about security? Let the server's certificate be validated before connecting; you don't have to allow insecure connections based on untrusted certificates. Need more? Provide a client certificate to authenticate yourself against the server.

All features in a nutshell:

- clean and simple interface
- hierarchical topic view
- sidebar with history of recently opened topics
- powerful full-text search capabilities across all topics and for a single message
- search results are automatically updated when new messages arrive
- extended message details, with proper formatting and syntax highlighting of JSON messages
- support for binary message payloads, displayed as either ISO Latin-1 or in a hex view
- easily copy any topic or message value
- authentication with username/password or client certificates
- connect over MQTT or WebSocket protocol
- support for MQTT 3.1.1 and MQTT 5
- support for SSL/TLS
- support for the Server Name Indication (SNI) TLS extension
- support for self-signed certificates
- full server certificate validation
- manage and connect multiple brokers at once
- full support for quality of service

## Key features

- Inspect MQTT messages
- Connect to any MQTT broker
- Subscribe to topics
- Full-text search across topics
- JSON highlighting
- Hex viewer for binary payloads
- Secure connection options

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/mqtt-loupe/id1617148458/reviews.md

### 5/5 — The best MQTT app out there

*2026-01-17*

Very well thought out. I keep finding new ways to use it. Only thing I can think that might make it better would be ability to change order of brokers, but that's very minor. Everything else is great.

### 1/5 — No use

*2024-08-20, version 1.8.9*

I enter a host (a valid host used by many devices/programs), press save, it says warning enter a host, host now seen to be blank.

### 5/5 — Works great with MQTT in Home Assistant

*2024-05-30, version 1.8.8*

I tried a few mqtt clients, none of them seemed to bring back all the topics/messages. This one did and was really useful.

### 1/5 — Does not work

*2022-11-09, version 1.6.3*

Will not connect to server on my local network when other mqtt viewers do. No explanation of error message.

## Frequently asked questions about MQTT Loupe

### What is MQTT Loupe?

MQTT Loupe is a utility application designed to inspect MQTT messages exchanged on an MQTT broker. It allows users to connect to brokers, subscribe to topics, and view message details.

### How does MQTT Loupe handle message payloads?

MQTT Loupe supports JSON highlighting for easy readability of JSON messages. For binary message payloads, it offers a hex viewer and can display them as ISO Latin-1.

### Can I search for specific messages with MQTT Loupe?

Yes, MQTT Loupe features powerful full-text search capabilities. You can search through all topics and individual messages, with results updating live as new messages arrive.

### Does MQTT Loupe support secure connections?

Yes, MQTT Loupe supports secure connections via SSL/TLS. It allows for full server certificate validation and can use client certificates for authentication.

### What MQTT versions does MQTT Loupe support?

MQTT Loupe supports both MQTT 3.1.1 and MQTT 5 protocols, ensuring compatibility with a wide range of MQTT brokers and systems.

### How often is MQTT Loupe updated?

The app was last updated on October 19, 2024, indicating active development and maintenance. This suggests regular updates to improve functionality and address any issues.

### What devices is MQTT Loupe available on?

MQTT Loupe is available for iPhone, iPad, and iPod devices, making it accessible to a broad range of Apple users.

### Is MQTT Loupe free to use?

Yes, MQTT Loupe is available for free, with no in-app purchases or advertisements mentioned in its description.

## Version history (last 5 releases)

### 1.9.1 — 2024-10-19

Improve handling of very large payloads
Add ability to search in binary payload
Add toggle for case-sensitive search in payload

### 1.9.0 — 2024-08-30

Add support for viewing binary message payloads, including a new hex viewer
Several user interface improvements and bugfixes

### 1.8.9 — 2024-06-12

Add support for custom paths for WebSocket connections 
Several user interface improvements and bugfixes

### 1.8.8 — 2023-11-20

Remember connected servers after restart
Fix server handling in multi-window environments

### 1.8.7 — 2023-11-07

Added a preview of details for the current message in each topic
Added the ability to search within the payload of a single message and navigate between the results
Added the ability to walk the message history in the details view
Improved topic hierarchy navigation by jumping straight to the first non-empty subtopic and skipping empty intermediate topics
Added advanced server settings
User interface improvements and bugfixes

Version 1.8.1:

Add support for TLS Server Name Indication (SNI)
Disable Apple's App Transport Security in favour of our certificate validation, allowing untrusted WebSocket connections

Version 1.8.2:

Show preview of current message payload in topic search results
User interface improvements and bugfixes

Version 1.8.3:

User interface improvements and bugfixes

Version 1.8.4:

Improved certificate validation

Version 1.8.5 and 1.8.6

User interface improvements

Version 1.8.7:

Show warning when subscription requests are rejected
Several user interface improvements and bugfixes

## Apps similar to MQTT Loupe

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [ATS MQTT Client](https://appshunter.io/ios/app/ats-mqtt-client/id1485411018) | 3.0 (2) | Free | Utilities |
| [IoT MQTT Panel](https://appshunter.io/ios/app/iot-mqtt-panel/id6466780124) | 4.8 (37) | Free | Utilities |
| [Remote-RED](https://appshunter.io/ios/app/remote-red/id1529777665) | 4.7 (6) | Free | Utilities |
| [MQTT-Client](https://appshunter.io/ios/app/mqtt-client/id6443841176) | — | Free | Utilities |
| [Dash IoT](https://appshunter.io/ios/app/dash-iot/id1574116689) | — | Free | Utilities |
| [Viewu](https://appshunter.io/ios/app/viewu/id6502717790) | 5.0 (7) | Free | Utilities |

## More apps by Jakob Bieling

- [MQTT Loupe Pro](https://appshunter.io/ios/app/mqtt-loupe-pro/id1621322612)

All apps by Jakob Bieling: https://appshunter.io/developer/1617148460

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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 2026-06-01.*