The best Circuit Designer alternative to Circuit JS is Multisim. It's not free, so if you're looking for a free alternative, you could try Micro-Cap or Experimenters Circuits. If that doesn't suit you, our users have ranked more than 25 alternatives to Circuit JS and five of them are Circuit Designers so hopefully you can find a suitable replacement. Other interesting Circuit Designer alternatives to Circuit JS are ECStudio and Circuit Tree.
Circuit JS alternatives are mainly Circuit Designers, but if you're looking for
Circuit Simulators or Electronic Design Automation Tools you can filter on that. Other popular filters include
Linux and
Mac. You can also filter by region, for example
EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to Circuit JS.