MQTT Explorer & IoT Client

MQTT Explorer & IoT Client turns your Android phone into a complete MQTT toolkit. Connect to any MQTT broker, watch every topic update live, read payloads in seconds, publish commands and build dashboards for your smart home, sensors and industrial devices.

Made for makers, IoT developers, smart-home users and engineers who need to see what is happening on their broker, wherever they are.

EXPLORE TOPICS LIVE
• Live topic tree with message counts, retained flags and value previews
• New messages light up as they arrive, so changes are easy to spot
• Search topic names and payloads; filter by retained, numeric or JSON
• Topic map: see your whole broker as a graph and find the busiest branches

READ ANY PAYLOAD
• Pretty-printed JSON with syntax colors, plus Raw, Hex and Base64 views
• Message history and a clear diff of what changed
• MQTT 5 properties and user properties
• Decoders for Protobuf, Sparkplug B and binary values

PUBLISH AND CONTROL
• Publish with QoS 0, 1 or 2 and retain
• JSON validation, saved templates and quick-publish buttons
• Live message log with pause, filters and in/out direction

CHARTS, DASHBOARDS AND ALERTS
• Real-time charts for numeric topics with min, max and average
• Dashboards with gauges, switches, sliders, value tiles and charts
• Threshold alerts as notifications, even in the background
• Automations: when a topic changes, publish a message or notify you
• Home-screen widgets and a Quick Settings tile

CONNECT SECURELY
• MQTT 3.1.1 and MQTT 5.0
• TCP, TLS (MQTTS), WebSocket and secure WebSocket (WSS)
• Username and password, CA and client certificates
• Last Will, clean start, keep alive and session expiry
• Auto-reconnect with an offline message queue
• Passwords and private keys are encrypted with Android Keystore

POWER TOOLS
• Record traffic and replay it at 0.5× to 10× speed
• Benchmark throughput and latency (p50, p95, p99)
• Broker statistics from $SYS topics
• Find and clear old retained messages in bulk
• Import, export and share broker settings by QR code

WORKS WITH
Standard MQTT brokers such as Mosquitto, EMQX and HiveMQ, and smart-home setups such as Home Assistant, Zigbee2MQTT and Tasmota, as well as ESP32 and ESP8266 projects.

FREE AND PRO
The app is free to use and supported by ads. Pro (monthly, yearly or a one-time purchase) removes ads and unlocks unlimited brokers, dashboards and widgets, client certificates, 7-day chart history, record and replay, and benchmarking. Some features can also be unlocked for a limited time by watching a short video.

PRIVACY
Your broker settings and MQTT messages are stored on your device and are never sent to our servers.

This is an independent app and is not affiliated with the projects or companies named above. All trademarks belong to their owners.