Modbus TCP Pro vs IoT Panels

Modbus Reader & Writer is a powerful and intuitive Modbus TCP tool designed for professionals. Built for installers, HVAC technicians, engineers, and system integrators who need a fast and reliable way to test, read, and write Modbus registers directly from their iPhone. Whether you work with heat pumps, PLCs, energy meters, or industrial controllers, this app gives you full control over Modbus TCP devices — anytime, anywhere. Key Features • Modbus TCP Connectivity • Connect to any Modbus TCP device using IP address and port • Configurable Unit ID (slave ID) • Read Registers • Holding Registers (Function Code 03) • Input Registers (Function Code 04) • Support for multiple data types and values • Write Registers • Write Single Register • Write Multiple Registers • Instant feedback and clear error reporting • Designed for Testing & Debugging • Ideal for commissioning and troubleshooting • Perfect for field testing without a laptop • Compatible with Modbus simulators and test environments (e.g. Node-RED) Who Is This App For? • HVAC installers and service technicians • Industrial automation and PLC engineers • Energy and building management professionals • System integrators and commissioning engineers • Developers testing Modbus-based systems Reliable & Efficient • Fast and stable connections • Clear and actionable error messages • Clean, focused interface — no unnecessary complexity • Optimized for real-world professional use Modbus Reader & Writer is your mobile Modbus toolbox — ready for every installation, test, and service intervention.

Visualize and control your IoT devices from iPhone, iPad, and Mac. IoT Panels is the essential dashboard app for smart home enthusiasts, IoT developers, and anyone working with sensor data and connected devices. Free, open source, and no ads. BUILD CUSTOM DASHBOARDS • Create interactive dashboards with drag-and-drop panels • Line charts, band charts, heatmaps, gauges, sparklines, stacked bar and area charts, state timelines, tables, and more • Threshold-based color rules for at-a-glance status • Design your own widget templates and use them on your home screen • Grid-based layout with multiple panel sizes CONNECT YOUR DATA SOURCES • MQTT broker support with SSL/TLS, client certificates, and ALPN • InfluxDB 1.x (InfluxQL), 2.x (Flux), and 3.x (SQL) • Prometheus with guided query builder and raw PromQL editor • Automatic MQTT topic and Prometheus metric discovery • Multiple data sources per dashboard • Persistent MQTT data store — data survives restarts and view changes • Built-in demo data to explore features instantly DASHBOARD TEMPLATES • Pre-built templates for quick setup — get started in seconds • Node Exporter Lite template for Prometheus with 8 panels • Automatic unit conversion — bytes, temperature, rates, and more POWERFUL QUERY BUILDER • Visual query builder — no code required • Select measurements, fields, and tag filters with autocomplete • Aggregation functions: min, max, mean, sum, and more • Compare current data against historical periods — spot trends and anomalies • Manual query editor for advanced users MULTI-HOME SUPPORT • Organize dashboards by home or location • Switch between homes with a tap • Custom icons for each home WORKS EVERYWHERE • Native experience on iPhone, iPad, and Mac • Home screen widgets with your custom designs • Lock screen widgets powered by your queries — see live data at a glance • Background sparklines on gauges and single-value panels for trend at a glance • Real-time data with configurable refresh intervals • Offline support with intelligent data caching PUBLISH AND CONTROL • Send MQTT messages directly from the app • Control IoT devices and actuators • Topic discovery for quick access BACKUP AND EXPORT • Full backup and restore of all configurations • JSON and CSV data export for further analysis Available in English, German, Spanish, French, Japanese, Portuguese, Korean, and Chinese. Have feedback or feature requests? Visit our GitHub page — IoT Panels is open source and community-driven.