MQTT Access
A fast, native desktop MQTT explorer. Connect tomultiple brokers simultaneously, watch topics update live, chart numeric values over time, and publish messages — all in one minimal, keyboard-friendly app.
Free & open source, MIT licensed · Windows, macOS & Linux
Everything you need to explore a broker
Built for developers who live in MQTT day to day.
Multiple brokers at once
Connect to any number of brokers simultaneously, each in its own resizable, draggable, minimizable dock panel.
Live topic tree
A virtualized, hierarchical topic tree with per-topic value previews, message counts, retained flags, and an activity blink you can turn off.
Value, History & Diff
Syntax-highlighted payloads with type detection (JSON/Number/Boolean/String/Binary), full message history, and a diff mode that highlights exactly what changed.
Live trend charts
Pin any numeric value — top-level or nested inside JSON — to a live chart. Trends persist across restarts with pause/resume, custom colors, and CSV export.
Publish panel
Send messages as Plain, JSON, Base64, Hex, or XML with format validation, syntax highlighting, one-click prettify, QoS 0/1/2, and retain.
Test before you connect
Dial a broker to verify credentials and reachability without saving or disturbing any existing connection.
Every transport, with TLS
mqtt, mqtts, ws, and wss, with username/password auth, CA/client certs, and self-signed certificate support.
Themes, sizes & languages
5 themes (Dark, Light, Dracula, and two high-contrast modes), 3 font sizes, and 8 languages including English, Türkçe, Bahasa Indonesia, 日本語, 中文, Español, Deutsch, and Français.
Persistent, local-first
Connections, window layout, trends, and settings are saved locally. Message data stays in RAM with a bounded per-topic history — nothing leaves your machine unless you connect it to a broker.
Five themes, your choice
Dark, Light, Dracula, and two high-contrast modes — switch anytime from Settings.
Get MQTT Access
Free and open source under the MIT License. Downloads are published as GitHub release packages.