Comparison

HMI Draw, native HMI/SCADA development environment vs Electrical Calculations

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

Electrical Calculations

This app provides a comprehensive suite of electrical calculations for professionals. It supports various international standards and offers detailed reports in PDF format. The tool covers wiring, power, motor, and electronic calculations, along with extensive conversion tables and resources.

Highlights
  • Wire size and voltage drop calculations
  • Power, current, and resistance calculations
  • Motor performance and connection diagrams
  • Electronic component calculations
  • Extensive unit conversions
  • PDF report generation
  • Support for IEC, CEI, NEC, CEC standards
Features
Read full description

Electrical Calculations is the PROFESSIONAL app for those who work with electrical systems every day: design, size and verify in just seconds, from the job site or the office. Over 200 calculations, diagrams, formulas and tables in a single app, with clear, printable PDF reports to attach to your documents. Designed for electricians, installers, designers and surveyors, it saves you time and helps you avoid mistakes: from cable sizing to short circuit. COMPLIANT WITH STANDARDS Reliable results aligned with the main standards: IEC (International Electrotechnical Commission), CEI (Italian Electrotechnical Committee), NEC (National Electrical Code), CEC (Canadian Electrical Code). WHY CHOOSE IT SAVE TIME: the calculations you'd do by hand, instantly available here. AVOID ERRORS: verified formulas and up-to-date regulatory parameters. PROFESSIONAL REPORTS: PDF reports ready for printing and archiving. ALWAYS WITH YOU: over 200 tools including calculations, converters, tables and pinouts. THE MOST USED CALCULATIONS Cable sizing and coordination with the protective device, voltage drop, operating current, current intensity, voltage and power (active, reactive, apparent). Power factor and power factor correction. Current capacity of conductors and busbars, sizing of conduits and trunking, maximum cable length. SHORT CIRCUIT AND PROTECTION Short-circuit current at a point on the line, earthing system and coordination with the residual current device, cable protection against short circuit (K²S²), power loss, cable temperature, neutral current. ELECTRIC MOTOR Motor current, power, voltage, efficiency and power factor, slip, speed, maximum torque and full-load current. Three-phase motor connection diagrams, terminal markings. Three-phase to single-phase. ELECTRONICS Color and alphanumeric codes for resistors, capacitors and inductors, SMD code, LED resistor, voltage and current divider, Zener diode, battery life, resonant frequency, fuses and transformers. CONVERSIONS Delta-star, AWG, SWG, cross-section, length, energy, temperature, pressure, Ah/kWh, var/µF, Gauss/Tesla, RPM and many more. RESOURCES AND TABLES Tripping curves, cable reactance and resistivity, cable dimensions and weight, distribution systems (TT, TN, IT), IP/IK/NEMA protection ratings, ATEX marking, insulation classes, electrical symbols, ANSI device codes, plugs and sockets, IEC 60309, NEMA and EV charging connectors, SI prefixes and units of measurement, thermistors and thermocouples. PINOUTS Ethernet RJ-45, Ethernet with PoE, USB, HDMI, VGA, DVI, RS-232, FireWire, SATA, DisplayPort, Apple Lightning, Raspberry Pi, OBD II, XLR audio/DMX, MIDI, Jack, RCA, Thunderbolt, SD Card, SIM Card and LED. Stop searching everywhere for formulas and tables: PUT YOUR ENTIRE ELECTRICAL LAB IN YOUR SMARTPHONE. Download Electrical Calculations and work faster, with standards-compliant results. Terms of service (EULA): https://www.egalnetsoftwares.com/terms_of_service_app/

Screenshots

HMI Draw, native HMI/SCADA development environment3 screens
Electrical Calculations4 screens

Verdict

The call

The clearest difference is rating: Electrical Calculations at 4.6 against HMI Draw, native HMI/SCADA development environment's 3.0. Electrical Calculations also leads on review sentiment (87% vs 53%) and ratings volume (128 vs 7). HMI Draw, native HMI/SCADA development environment's advantage is ads (none vs shown) and iOS requirement (8.0 vs 15.0). On price, in-app purchases, monetization model 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

Both are free to download. HMI Draw, native HMI/SCADA development environment sells 3 one-off in-app purchases and Electrical Calculations sells 3 in-app purchases, starting at $3.99 per 3 months. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Electrical Calculations holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: Electrical Calculations has 128 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 53% of HMI Draw, native HMI/SCADA development environment's written reviews are positive against 87% of Electrical Calculations's.

UpkeepUpdate frequency

HMI Draw, native HMI/SCADA development environment ships an update every 6 weeks, Electrical Calculations every 3 weeks. The most recent releases landed on September 28, 2026 and October 15, 2026 respectively.

Scorecard6 real differences · 4 level
HMI Draw, native HMI/SCADA development environment versus Electrical Calculations: the parameters behind the verdict, then further details
ParameterHMI Draw, native HMI/SCADA development environmentElectrical Calculations
PriceFreeFree
Rating3.0 (7 ratings)4.6 (128 ratings) — better
Positive reviews53.3% of reviews86.7% of reviews — better
Number of ratings7128 — better
Update frequencyEvery 6 weeksEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better15.0
Further details — not scored
Size18 MB56 MB
Age rating4+4+
DeveloperSweetWilliam, S.L.Egal Net di Ettore Gallina

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%

Electrical Calculations

All ratings128 ratings
Positive92.2%
Neutral1.6%
Negative6.3%
Written reviews309 reviews
Positive86.7%
Neutral2.3%
Negative11.0%

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
3 purchases

Electrical Calculations

Subscriptions2
  • PRO Version (3 months)$3.993 Months
  • PRO Version (1 year)7 Days trial$7.491 Year
One-time1
  • PRO Version (Lifetime)$89.99

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 Electrical Calculations free?
Electrical Calculations is free to download, with in-app purchases available.
Which has better reviews, HMI Draw, native HMI/SCADA development environment or Electrical Calculations?
Electrical Calculations is rated higher. HMI Draw, native HMI/SCADA development environment averages 3.0 out of 5 from 7 ratings, while Electrical Calculations averages 4.6 from 128 ratings.
Do HMI Draw, native HMI/SCADA development environment or Electrical Calculations have ads?
Electrical Calculations shows ads; HMI Draw, native HMI/SCADA development environment does not.
Which is updated more often, HMI Draw, native HMI/SCADA development environment or Electrical Calculations?
HMI Draw, native HMI/SCADA development environment ships an update every 6 weeks, and Electrical Calculations every 3 weeks. Most recently, HMI Draw, native HMI/SCADA development environment was updated on September 28, 2026 and Electrical Calculations on October 15, 2026.

Other comparisons