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MQTTy vs MQTTX: catalog facts
MQTTy	MQTTX
Free Free and open source under the GPL-3.0 license.	Free Free to download and use.
Windows, Linux	Windows, macOS, Linux, Web, Self-hosted, Command line
Publishes messages and subscribes to MQTT topics Supports multiple connections in separate tabs	Desktop, CLI and web versions share one workflow Supports MQTT 5.0, 3.1.1 and 3.1
Requires access to an MQTT broker	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	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 24, 2026

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