Odrid HMI 4+

Industrial grade HMI/SCADA

Jan Almqvist

    • $4.99


Incredibly low price. Pay once! No in-app purchases. No subscriptions. No activations. Free-of-charge development tool with test run feature.

Operator panel for various industrial control system. Communication over Wi-Fi or mobile internet with the protocols Modbus/TCP (Class 0 and 1), Modbus RTU class 1 and Siemens S7 Communication (ISO-on-TCP).

Odrid HMI is an alternative to traditional SCADA systems and operator panels. The app supports multiple data types and has easy navigation between panels (pages).

Odrid HMI is also great to use for home automation with PLCs that have eg Modbus/TCP protocol is implemented to remotely control and monitor lighting, ventilation, heating etc in the residence or holiday home.


Excellent technical support.
Free updates.
Graphic HMIs with multi touch function can be created in minutes.
Free development tool with test run feature.
Virtually unlimited number of panels (pages), objects and variables.
Does not require any third-party services.
Genuine native app, not based on neither HTML nor OPC technology.


Parameters for communication such as IP address, port number, protocol, etc. can be specified per panel (page).
Automatic polling of all variables displayed in the current panel (page), no need for separate tag list.
Many formats for numeric variables such as 16 and 32 bit integer, unsigned, hex, ASCII, float (IEEE 754), etc.
Prioritized event-driven transfer to the controller.
Panels (pages) are edited in the measurement unit dp (Density Independent Pixels).
Life bit for monitoring the operator panel in the controller. (Function similar to coordination area in Siemens S7.)
Numeric variables can be displayed as predefined text for example alarms, sequence steps etc.
Detailed diagnostics of connection and communication.
Variable areas for system variables, local variables and constants.
Possibility of automatic return to the start panel (page) after some time of inactivity.
Selectable order for high and low words of 32-bit variables in the Modbus protocol.
Poll interval can be set do save data traffic or battery.
Support for Greek, Turkish, Baltic, Central European, Eastern European, Cyrillic, Japanese (Shift JIS) and Chinese (GB2312, BIG5) character sets.
Ability to test run panels (pages) in the development tool.
LED-objects can be displayed as rectangles and in any size e.g. for Andon-systems.
Background color for panels (pages) can be selected.
Modbus Slave Id can be changed with GUI objects during operation.
Image buttons.
Password fields.
Floating point and hexadecimal number formatting.
Timestamp for panel (page) files.
Document information in panel (page) files.

Implemented protocols in the current version:

Modbus/TCP: Class 0, Function 3 and 16. Reads and writes 64,512 holding registers.

Modbus/TCP: Class 1, Function 1, 2, 4 and 5. Reads 65,535 discrete inputs, 65,535 input registers and reads and writes 65,535 outputs (coils).

Modbus RTU: Class 0 and 1.

Siemens S7 Communication: Reads and writes 8192 bytes in datablock 1 to 4095 and in the Input, Memory and Output areas.

(Default value for highest Siemens S7 databock is 255.)

Free development tool for used to make the panels (pages) to be run by Odrid HMI:


Version history:

Modbus and Modbus/TCP are registered trademarks of Schneider Automation Inc.

What’s New

Version 1.5.6

Bugfixes in the Siemens S7 Communication (ISO-on-TCP) protocol driver.
Bugfix in the Line Chart object for ANR problem.
New system register R64542 for last read DBNO when using the Siemens S7 Communication (ISO-on-TCP) protocol.

Ratings and Reviews

AHTman ,

Click with Modbus TCP. Very pleased.

Works great! Quickly set up a screen to change the start times of my 4 zone sprinkler system. PLC is a Automation Direct Click with Modbus TCP. Addressing was a little tricky but used the application example and had it working in about an hour. Very pleased.

Sebraun ,

HMI for iOS

This is a very simple and highly effective HMI for iOS. I looked for years for something simple, quick to setup, and cost effective. So far, this is the best. Very reliable communications drivers. For the price, there is enough functionality. The support is immediate and accommodating. I needed an enhancement done to the scaling routine and it was ready and released in a couple of weeks. I am using this app to allow operators and maintenance people to remotely read a critical water tank level and backup power IO for a small town public water system.

App Privacy

The developer, Jan Almqvist, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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