Altium Designer is described as «PCB Design Software» and is a CAD software in the education & reference category. There are more than 25 alternatives to Altium Designer for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and iPhone. The best alternative is KiCad, which is both free and Open Source. Other great apps like Altium Designer are Fritzing, Autodesk EAGLE, QUCS and LibrePCB.Altium Designer alternatives are mainly Circuit Simulators but may also be Electronic Design Automation Tools or CAD Software. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Altium Designer.