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MQTTX vs MQTT5 Explorer: catalog facts
MQTTX	MQTT5 Explorer
Free Free to download and use.	Free Free and open source under the GPL-3.0 licence.
Windows, macOS, Linux, Web, Self-hosted, Command line	Linux
Desktop, CLI and web versions share one workflow Supports MQTT 5.0, 3.1.1 and 3.1	Aims to support all MQTT 5 features Works with any MQTT broker
Focused on MQTT only, not general HTTP APIs Some features steer toward the EMQX ecosystem	Small project with a limited community Release activity is not clear from the repository page
Downloadable app, Web application, Self-hosted	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-only
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 September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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