The Native MQTT Client for iOS You've Been Waiting For

A Truly Native iOS MQTT Client

Most MQTT tools are ports of desktop apps or browser-based utilities that feel out of place on iPhone. MQTT Commander was built from the ground up in SwiftUI for iOS and iPadOS, so it follows native interaction patterns, supports Dynamic Type, and runs comfortably on both a 6-inch iPhone screen and a 13-inch iPad display. It requires iOS 15 or later, costs $2.99 as a one-time App Store purchase, and carries no subscription, ads, or in-app purchases. Your broker credentials and message history never leave your device.

Connection Doctor: Diagnose Problems in Six Steps

Getting an MQTT connection working — especially over TLS or WebSocket — can involve half a dozen failure points that all look the same from the outside. Connection Doctor runs a staged diagnostic sequence: DNS resolution, TCP handshake, TLS negotiation, WebSocket upgrade, MQTT CONNECT, and finally a test subscription. Each stage reports a pass or a clear error message so you know exactly where the problem is, whether that's a firewall blocking port 8883, an expired server certificate, or a mismatched ALPN protocol. It eliminates the guesswork that costs hours when commissioning a new broker or troubleshooting a regression.

Certificate Wizard: Painless mTLS on iPhone

Mutual TLS is the gold standard for broker security, but importing certificates on a mobile device has historically been painful. The Certificate Wizard accepts .p12, .pfx, and PEM bundles and immediately validates the full chain, expiry dates, Subject Alternative Names, and Common Name. It supports ALPN protocol negotiation — including x-amzn-mqtt-ca for AWS IoT Core — and SNI so that SNI-based virtual hosting works correctly. Once imported, a certificate profile is reusable across connections without re-entering passwords. The wizard turns what used to be a half-day exercise into a two-minute task.

Payload Inspector and Topic Tree

Raw binary or JSON blobs are hard to read in a scrolling message list. The payload inspector renders incoming and outgoing messages as formatted JSON with syntax highlighting, a diff view that highlights exactly what changed between two consecutive messages, hex and Base64 views for binary payloads, and inline image rendering for camera or sensor frames. It also supports JSONPath queries so you can filter a noisy topic down to the one field you care about. The topic tree groups live subscriptions into a collapsible hierarchy and ships with presets for Home Assistant and Zigbee2MQTT topic namespaces, so familiar structures appear correctly labeled from the first message.

Full MQTT Protocol Support and Safe Publishing

MQTT Commander supports MQTT 3.1.1 and MQTT 5.0, all three QoS levels (0, 1, 2), wildcard subscriptions (# and +), shared subscriptions, retained messages, and Last Will configuration. On MQTT 5, the full property set — including message expiry, content type, response topic, correlation data, and user properties — is exposed in the connection and publish editors. The publish editor includes a confirmation prompt for retained messages so you don't accidentally overwrite broker state. Connections are made over TCP, TLS, WebSocket, and WSS, making MQTT Commander compatible with every major hosted broker and self-hosted option such as Mosquitto, EMQX, HiveMQ, and AWS IoT Core.