List of the Top 7 Free Electrical Design Software in 2026

Designcenter Solid Edge is a Siemens portfolio of product development tools created to help teams design, simulate, manufacture, document, and manage products in a connected environment. It covers key areas of the development lifecycle, including 2D drafting, 3D design, electrical design, simulation, data management, computer-aided manufacturing, 3D printing, technical publications, and cloud collaboration. The software combines direct modeling and parametric modeling through synchronous technology, giving users both fast design flexibility and precise control over product geometry. This makes it easier to create new components, modify vendor CAD files, respond to design changes, and build realistic 3D models for customers or internal teams. Designcenter Solid Edge is designed to be easy to learn and affordable while still offering a broad range of professional engineering capabilities. Product teams can use it to accelerate concept development, improve design communication, validate ideas, and prepare manufacturing outputs. Its simulation tools help users examine performance earlier in the process, while its technical publication tools support clear manufacturing, assembly, installation, and maintenance documentation. Data management and cloud collaboration features help teams reduce version issues, improve access to current information, and coordinate work across locations. The portfolio also supports manufacturing and 3D printing workflows, helping organizations move more smoothly from digital design to physical production. Designcenter Solid Edge can be valuable for companies that need to make design changes quickly, reuse external CAD data, and avoid expensive prototyping delays. With a scalable portfolio and integrated development tools, Designcenter Solid Edge helps businesses improve productivity, lower barriers to professional CAD adoption, and bring products to market faster.

QElectroTech is a free, open-source application that allows individuals to create complex industrial electrical diagrams effortlessly. It supports various types of diagrams, including those related to electrical systems, plumbing, geothermal energy, air conditioning, hydraulics, pneumatics, home automation, and solar power systems. The most recent version includes over 8,000 symbols, enabling users to produce highly intricate technical diagrams across several fields. Available under the GNU/GPL license, this software can be operated on Windows, Mac OS, and Linux platforms. Users can take advantage of a flexible symbol library and user-friendly tools that aid in generating professional-grade schematics. Contributions from numerous industrial companies and engineers, such as Soliton Controles Industriais and C-Born Engineering, are essential for its continuous development and translation. Additionally, QElectroTech offers DXF export functionality, which increases its compatibility with other software tools, thereby expanding its applications in various professional environments. The collaborative efforts in its development reflect a strong dedication to providing a reliable and modern tool for all users. This strong community involvement ensures that the software remains relevant and efficient in meeting the evolving needs of its audience.

Cableizer is a comprehensive software solution for designing electrical, mechanical, and thermal cables. Being a web-based application, it offers an affordable, easily accessible, and customizable option for users, while also providing enhanced interoperability and simplified maintenance compared to traditional desktop software. This innovative tool allows for cable design up to an impressive voltage of 500kV. Among its many features, Cableizer performs critical calculations including the mass of the cable, the heat produced during burning, carbon dioxide emissions, and overall pricing. It also assesses cable pull and rated current, along with environmental impact evaluations such as magnetic field strength and increases in ground temperatures. The convenience of this web application eliminates the need for installation or dongles, as it comes with automatic updates, and users can easily share links with customers for seamless collaboration. In addition, the software's user-friendly interface ensures that even those less familiar with cable design can navigate its features effectively.

SkyCAD enhances efficiency by simplifying tasks related to wire and component numbering, managing parts lists, creating bills of materials (BOMs), updating cross-references, and designing panel layouts, among other capabilities. Its functionalities include automated numbering and parts-list management, cross-referencing, and the ability to share licenses, all of which require no user training to implement. With unique design-reuse features such as design-by-systems and configuration management, it ensures both efficiency and consistency across projects. The platform also provides intuitive tools for generating PLC and other component blocks automatically, and users can create PLC drawings directly from an Excel I/O list, making the process even easier. Furthermore, the integration of panel layout design within the software streamlines workflows significantly. SkyCAD supports both European and American drawing standards, catering to diverse user needs. To aid in user adoption, an extensive library of tutorials and active support forums are available, assisting users in quickly understanding the software's features. Users have the option to select between a standard (free) license that meets basic requirements or an advanced license that unlocks additional features at a reasonable cost. The software's adaptability ensures it can be effectively utilized across various industries and project types, making it a versatile solution for professionals. Whether for large-scale industrial projects or smaller applications, SkyCAD provides the tools necessary to enhance productivity and ensure project success.

CableCalc BS7671 is an advanced software tool tailored for electrical design and calculations, fully adhering to the latest BS7671:2018+A2:2022 standards, also referred to as IET Wiring Regulations 18th Edition Amendment 2, which aids electrical experts in the precise sizing of cables, evaluating circuits, and devising distribution board projects. The program is proficient in executing calculations for both single-phase and three-phase setups, covering a variety of circuit types such as radial, ring, and sub-main configurations; it determines essential parameters like voltage drop, disconnection times, fault currents, earth fault values, overload contingencies, and short-circuit metrics, while factoring in correction elements such as temperature changes and cable grouping. With its comprehensive databases of copper cables and protective devices, it streamlines the selection process for users and features robust tools for generating detailed documentation, including calculation reports, schedules, single-line diagrams, and schematic drawings, making it applicable to a wide range of projects from simple circuits to intricate multi-distribution board systems. Moreover, the software's intuitive interface allows both experienced professionals and newcomers to electrical design to use it efficiently, thereby improving productivity and precision in electrical installation tasks. This adaptability ensures that users can confidently tackle diverse project requirements, making CableCalc an invaluable resource in the field of electrical engineering.

You can effectively navigate the schematic and layout in PCBWeb Designer using either your mouse or keyboard. Zooming in and out of the active design area can be easily done with the scroll wheel or by pressing the page-up and page-down keys. To quickly return to a zoom level that displays your entire design, simply click the icon in the lower right corner or press the home key. For panning across the interface, hold down the right mouse button while moving the mouse, or alternatively, utilize the scroll bars found at the bottom and side of the application. Furthermore, PCBWeb Designer includes a robust component catalog, which enables you to search, filter, and place components that have both a symbol and footprint, thereby increasing your design efficiency. This integrated feature not only simplifies the design workflow but also ensures that users can locate necessary components quickly, enhancing productivity. Overall, PCBWeb Designer is designed to facilitate a smoother design experience for all users.

Relay Tripping Curves PRO2 (RTC2) is a specialized Windows application crafted by protection engineers for their colleagues in the field. It allows users to create trip curves for relays, circuit breakers, and transformers on a log-log graph, which helps ensure that the selectivity between various devices is confirmed and generates detailed technical reports essential for engineering tasks. While field testing equipment can provide data, they often lack the ability to relate these readings to the main system, visualize the curves, or confirm that settings are in coordination, a void that RTC2 successfully fills. Noteworthy features include compatibility with seven relay manufacturers, mirroring the original display and terminology, ten types of circuit breaker trip units that cover L/S/I/G zones, and a transformer damage curve that adheres to ANSI/IEEE C57.109-2018 standards. The software also offers functionalities for analyzing inrush and short-circuit currents, performing ΔT selectivity calculations among devices, and generating PDF reports that include primary-equivalent current, curve equations, plots, and signatures. Additionally, it is completely bilingual, supporting both English and Spanish, and functions entirely offline. Users have the opportunity to try a free DEMO version with no time limitations, while the paid versions provide a perpetual license for a one-time fee, making it accessible for engineers with varying needs. This combination of features and flexibility ensures that RTC2 remains an invaluable tool for professionals in the field.