Comparison

HMI Draw, native HMI/SCADA development environment vs Calctronics

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

Head to head
About

HMI Draw, native HMI/SCADA development environment

Create custom industrial monitoring and control interfaces on iOS devices. Design dynamic dashboards with various elements and connect them to PLC systems. Develop and test projects for free, with activation fees for deployment.

Highlights
  • Customizable page layouts
  • Real-time monitoring and control
  • Support for major PLC brands
  • On-screen project editing
  • Export/import project and asset files
  • Cloud storage and deployment options
  • Native PLC communication protocols
Features
Read full description

HMI Draw is a *native* iOS application for creating Human Machine Interfaces for real time monitoring and control of industrial PLC based systems and processes. Data is presented in highly customizable page layouts much like a presentations app. Who's this for. The app is aimed at automation engineers or industrial machine manufacturers on many sectors including but not limited to building automation, industrial processing, power plants, water plants, industrial equipment, transportation and so on, who want to provide instant, reliable access to real time data right from iOS devices. What you'll get for the price of the app. HMI Draw allows you to create efficient, advanced, highly responsive "Human Machine Interfaces" right on your iPad screen with unprecedented ease of use and fun. The HMI Draw app is fully native and supports all major Programmable Logic Controller (PLC) brands. For the price of the app (FREE) you can *fully* develop and test projects of any complexity. No restrictions on number of pages, tags or PLCs are applied at this stage. You only pay for project activations when you are ready to deploy to end users. HMI Draw essential Features. - Very fast, launches and connects immediately regardless of project size. - All data types including Strings, Arrays and Dictionaries fully supported. - HMI Projects are edited on-screen as you run and monitor your process. - You can export and edit your project files as text on your PC or Mac. - Export/import asset files such as images, pdfs or audio files from HMI Draw to your PC or Mac. - Optional project storage in the cloud and easy deployment to end users devices. - Native PLC communication protocols. Connections are performed with no intermediate servers or boxes. - Major PLC brands supported, including: Allen Bradley, Mitsubishi, Omron, Opto 22, Schneider Electric, Siemens, Wago. - TCP/IP based security. Getting Started: creating a HMI Pad project. Projects are created like a mix of PowerPoint and Excel. The concept is quite simple. You lay out elements such as Sliders, Switches, Buttons, Images, Text Fields, Knobs, Trends, Gauges, Bar Indicators, Web browser, Array pickers, even Gesture Recognizers and much more onto pages. You connect on-screen objects with iPad sensors and PLC tags through simple links or powerful expressions. That's it !!. The result is a stunning, dynamic, real-time presentation of your PLC controlled process as you'd never imagined. Examples Ready for You. Explore the examples and take the liberty to make changes on them. Create your own test projects from scratch or based on the examples. HMI Draw will comprehensively tell you what inconsistencies or problems there may be in your project as you build them. New examples are being added on a regular basis or by user request. What's Next. There’s a lot more that we haven’t mentioned here, such as the page navigation interface, the embedded file server, the model browser, the model seeker, the automatic expression completer, the inspector viewer, alarm notifications, iPad sensors, bar code scanner, user access levels, password on launch, PLC validation codes, individual tag diagnostics, background processing, automatic network switching, and much much more. You surely will identify some of these features by just exploring the app, but the single source where everything is covered is the HMI Draw Reference Manual. Feel free to download it from our site and look at the full possibilities, you’ll love the product. Technical Support. We provide a free on-line support service based on public forums on our web site: http://www.sweetwilliamsl.com/support/forums Or through direct email: support@sweetwilliamsl.com. We also hold a public youTube channel at: http://www.youtube.com/hmipad. Feel free to direct your questions, suggestions or feedback to any of the above. We'll be happy to hear from you.

About

Calctronics

This app provides a comprehensive suite of calculators and design tools for electronic engineering. It assists with circuit design, filter analysis, and component calculations for resistors, capacitors, and inductors. Ideal for both professionals and students, it simplifies complex electronic projects.

Highlights
  • Comprehensive calculator collection
  • Filter design with graph plotting
  • Resistor, transistor, capacitor design tools
  • Amplifier and inductor design
  • Circuit analysis and design
  • Offline functionality
Features
Read full description

Introducing the ultimate electronic engineering app! With its comprehensive collection of calculators and design tools, you'll be able to tackle any electronic project with ease. Our app features a filter design calculator that allows you to plot graphs, making it easier to visualize your calculations. Additionally, we've included resistor, transistor, capacitor, amplifier, and inductor design tools to help you tackle any electronic design problem. Whether you're a professional electronic engineer or just starting out, this app is the perfect tool to have in your arsenal. Download now and experience the power of electronic engineering in the palm of your hand! Here are some stuffs you can do with the app:- Circuit design Electrical calculations Filter design Resistor calculations Transistor design Capacitor design Amplifier design Inductor design Electrical engineering tools Electronic engineering calculator Circuit analysis --- The app contains the following calculators --- • Resistor Colour Code • Resistors in series and parallel • Capacitors in series and parallel • Capacitor charge • Resistor's Y to delta and delta to Y Converter • Resistor's Pi, Tee and bridge Tee attenuator • SMD Resistor Code • Capacitor Code includes polyester and ceramic capacitors • Ohm's Law • Transistor amplifier calculator • Filters Sallen-Key active filter, Butterworth, Chebyshev and Bessel filters • Voltage divider • Resistor Ratio • Skin depth • Decibel to Watt and Watt to decibel converter • Coaxial cable and 2 parallel wires impedance and capacitance calculator • Operational Amplifier eg inverting amplifier, Difference amplifier and Non inverting amplifier • LED series Resistor Calculator • Adjustable voltage regulator • 555 timer Calculator including Astable and monostable timer • Power dissipation • Micro strip trace width and impedance calculator • Inductor Design Tool • Cylinderical wave guide Calculator • Rectangular wave guide Calculator • PCB Trace Width Calculator • Series capacitor, inductor and resistor Resonance • Capacitive Reactance • Inductive Reactance • Power Calculator • Decibel Converter • Crossover calculator • Band pass and Band reject filter design Whether you're a professional engineer or a student learning about electronics, Electronics Calculator Pro is the perfect tool for your circuit design needs. With its comprehensive set of calculator tools and offline functionality, you'll have everything you need to design and analyze your circuits with confidence. Try it out today!

Screenshots

HMI Draw, native HMI/SCADA development environment3 screens
Calctronics4 screens

Verdict

The call

The clearest difference is rating: Calctronics at 4.0 against HMI Draw, native HMI/SCADA development environment's 3.0. Calctronics also leads on monetization model (free vs free with in-app purchases). HMI Draw, native HMI/SCADA development environment's advantage is review sentiment (53% vs 14%) and ads (none vs shown). On price, ratings volume, update cadence and in-app purchases 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

Both are free to download. HMI Draw, native HMI/SCADA development environment sells 3 one-off in-app purchases and Calctronics sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Calctronics holds the better App Store score, 4.0 against 3.0. Both are backed by a comparable volume of ratings — 7 and 5 respectively. Written reviews complicate that: 53% of HMI Draw, native HMI/SCADA development environment's written reviews are positive against 14% of Calctronics's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

HMI Draw, native HMI/SCADA development environment ships an update every 6 weeks, Calctronics every 2 months. The most recent releases landed on June 11, 2026 and September 9, 2026 respectively.

Scorecard5 real differences · 5 level
HMI Draw, native HMI/SCADA development environment versus Calctronics: the parameters behind the verdict, then further details
ParameterHMI Draw, native HMI/SCADA development environmentCalctronics
PriceFreeFree
Rating3.0 (7 ratings)4.0 (5 ratings) — better
Positive reviews53.3% of reviews — better14.3% of reviews
Number of ratings7 — better5
Update frequencyEvery 6 weeks — betterEvery 2 months
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better13.0
Further details — not scored
Size18 MB35 MB
Age rating4+4+
DeveloperSweetWilliam, S.L.Anas Abubakar

Customer experience

HMI Draw, native HMI/SCADA development environment

All ratings7 ratings
Positive42.9%
Neutral14.3%
Negative42.9%
Written reviews15 reviews
Positive53.3%
Neutral6.7%
Negative40.0%

Calctronics

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews7 reviews
Positive14.3%
Neutral14.3%
Negative71.4%

In-app purchases

3 purchases

HMI Draw, native HMI/SCADA development environment

One-time3
  • Activation for One Use$149.99
  • Activation for Five Uses$449.99
  • Activation for Ten Uses$799.99
1 purchases

Calctronics

One-time1
  • Upgrade to the Pro version$2.99

Questions

Is HMI Draw, native HMI/SCADA development environment free?
HMI Draw, native HMI/SCADA development environment is free to download, with in-app purchases available.
Is Calctronics free?
Calctronics is free to download, with in-app purchases available.
Which has better reviews, HMI Draw, native HMI/SCADA development environment or Calctronics?
Calctronics is rated higher. HMI Draw, native HMI/SCADA development environment averages 3.0 out of 5 from 7 ratings, while Calctronics averages 4.0 from 5 ratings.
Do HMI Draw, native HMI/SCADA development environment or Calctronics have ads?
Calctronics shows ads; HMI Draw, native HMI/SCADA development environment does not.
Which is updated more often, HMI Draw, native HMI/SCADA development environment or Calctronics?
HMI Draw, native HMI/SCADA development environment ships an update every 6 weeks, and Calctronics every 2 months. Most recently, HMI Draw, native HMI/SCADA development environment was updated on June 11, 2026 and Calctronics on September 9, 2026.

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