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MQTT5 Explorer vs MQTTX: catalog facts
MQTT5 Explorer	MQTTX
Free Free and open source under the GPL-3.0 licence.	Free Free to download and use.
Linux	Windows, macOS, Linux, Web, Self-hosted, Command line
Aims to support all MQTT 5 features Works with any MQTT broker	Desktop, CLI and web versions share one workflow Supports MQTT 5.0, 3.1.1 and 3.1
Small project with a limited community Release activity is not clear from the repository page	Focused on MQTT only, not general HTTP APIs Some features steer toward the EMQX ecosystem
Downloadable app	Downloadable app, Web application, Self-hosted
Open source	Open source
License: GPL-3.0-only	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.