Comparison

PLCLink vs Odrid HMI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

PLCLink

Features
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Supervision application for PLC or other URL command device. Particularly intended for supervision integrators, for research laboratory, up to end user or home remote. PLCLink can read and write one or more accessible PLC over Internet with ModBus or HTTP protocols and is well adapted for numerical results presentation. You just add a XML file inside app documents folder or inside PLC folder, some web page help you for this work. Transfert between PLC and application with ModBus (502) or HTTP (80) format. WAGO PLC are full compatibles because of SSI capabilities but some other ModBus PLC can be used to. • Configuration are easy to send for end user with a email. • Cell value can be send by email. (IFTTT action). • A room can be protected with a PIN code. • DropBox can help you for file storage. • QR Code can load wagoML source with plclink:// protocol. • Data can be saved in a .csv file. • Modbus record transfert mode for easy debug. • Modbus can now be synchronous for Schneider PLC. • Many data representation : text, days, month, bits and explicit icon. • A colorPicker for setting RGB lamp. • Push notification. • Action with javascript objects into iFrame. IPad version is very powerful with self editor for wagoML local file. PLCLink questions regularly this file (2s) and display results in a specific room window. This file comes with WagiML format, you will find a description here : http://pautex.fr/plclink/wagoml.php Entries can be saved and email up to final destination client, very easy to managed. This version allows playback of information by a url, the answer is direct text reply or included in an xml or JSON structure. These mode are ready good for small device as MBED and Raspberry PI. PUSH notification You choose a random 10+ digits number and simply with reading a specific URL you send calls to iPhones recorded with this number. All PLCs connected to the Internet are capable of producing this notification. Development : Pautex JF ¢ Pautex 2011-2024, NANCY

About

Odrid HMI

This app acts as an operator panel for industrial control systems, enabling remote monitoring and control via Wi-Fi or mobile internet. It supports various industrial protocols and can also be used for home automation, offering a flexible alternative to traditional SCADA systems.

Highlights
  • Industrial control system communication
  • Wi-Fi and mobile internet support
  • Modbus/TCP and Siemens S7 protocols
  • Home automation integration
  • Multi-touch graphic HMIs
  • Free development tool with test run
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NOTE: Read the description CAREFULLY before downloading! 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 pages using swipe gestures or buttons. Odrid HMI is also great to use for home automation with PLCs that have e.g. Modbus/TCP protocol is implemented to remotely control and monitor lighting, ventilation, heating etc in the residence or holiday home. Advantages: Excellent technical support. Free updates. Graphic HMIs with multi touch function can be created in minutes. Free-of-charge development tool with test run feature. Virtually unlimited number of pages, objects and variables. Does not require any third-party services. Genuine native app. Features: Parameters for communication such as IP address, port number, protocol, etc. can be specified per page. Automatic polling of all variables displayed in the current 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. 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 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 Baltic, Central European, Chinese (GB2312, BIG5), Cyrillic, Eastern European, Greek, Hebrew, Japanese (Shift JIS), Turkish, Vietnamese and Western character sets. Ability to test run pages in the development tool. LED-objects can be displayed as rectangles and in any size e.g. for Andon-systems. Background color for pages can be selected. Modbus Device ID can be changed with GUI objects during operation. Image buttons. Password fields. Floating point and hexadecimal number formatting. Timestamp for page files. Hyperlinks. Document information in 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-of-charge development tool for creating the pages to be used by Odrid HMI: https://www.idea-teknik.com/odrid_hmi_download.html Manual: https://www.idea-teknik.com/odrid_hmi_manual.html Version history: https://www.idea-teknik.com/odrid_hmi_version_history.html Modbus and Modbus/TCP are registered trademarks of Schneider Automation Inc. S7 and STEP 7 are trademarks of Siemens AG.

Screenshots

PLCLink4 screens
Odrid HMI1 screens

Verdict

The call

The clearest difference is price: PLCLink at $8.99 against Odrid HMI's $24.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

PLCLink costs $8.99 and Odrid HMI $24.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

PLCLink ships an update every 2 months, Odrid HMI every 3 months. The most recent releases landed on December 3, 2025 and September 15, 2026 respectively.

Scorecard1 real difference · 9 level
PLCLink versus Odrid HMI: the parameters behind the verdict, then further details
ParameterPLCLinkOdrid HMI
Price$8.99 — better$24.99
Rating4.0 (4 ratings) — better
Positive reviews70.0% of reviews
Number of ratings4 — better
Update frequencyEvery 2 months — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS12.012.0
Further details — not scored
Size4 MB1 MB
Age rating17+17+
DeveloperJean-Francois PautexJan Almqvist

In-app purchases

None

PLCLink

No in-app purchases

None

Odrid HMI

No in-app purchases

Questions

Is PLCLink free?
PLCLink costs $8.99, with no in-app purchases.
Is Odrid HMI free?
Odrid HMI costs $24.99, with no in-app purchases.
Do PLCLink or Odrid HMI have ads?
Neither PLCLink nor Odrid HMI shows ads.
Which is updated more often, PLCLink or Odrid HMI?
PLCLink ships an update every 2 months, and Odrid HMI every 3 months. Most recently, PLCLink was updated on December 3, 2025 and Odrid HMI on September 15, 2026.

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