MQTT Connect

MQTT Connect is a mobile MQTT client for iOS and Android that stores every broker, client, credential and certificate on the device with encryption. It operates without a cloud backend, account, or telemetry, so no data ever leaves the phone. The app supports full MQTT 3.1.1 and 5.0 over TCP, TLS, WebSocket and Secure WebSocket. Users can import CA and client certificates, including .p12 bundles, for mutual TLS authentication. A live message feed shows subscribed topics in real time, and a publish composer lets you send JSON, text or Base64 payloads with topic autocomplete and snippet pinning. Features also include smart topic suggestions, encrypted AES‑256 backup and restore protected by a password, Face ID auto‑lock, and offline‑first operation with zero analytics SDKs. Designed for people who run real MQTT deployments, MQTT Connect lets you manage multiple brokers and clients, keep credentials isolated, and debug topics directly from your phone without exposing any information to external services.