CircuitBlocks is programmed in NodeJS with Electron and built using Electron builder. The app is free open source software, and the source code is available on our GitHub. Every line of code in the app was programmed by me and another colleague, and the binary releases are compiled by me personally, so there is no possibility that any malicious code ended up in the app and this is most likely a false positive.
We’ve actually gotten a few reports by other people that AVG and McAfee are classifying CircuitBlocks as suspicious and are investigating why this has happened and working on getting in touch with the AV companies to resolve this error.
One reason I suspect this might have happened at this stage is the fact that when CircuitBlocks runs the first time it installs the Arduino IDE, arduino-cli and all the required components and platforms required for compiling our devices. Since a lot of viruses work by disguising itself as a legit program and then installing malware, it is possible that the defender detects CircuitBlocks installing other programs and flags it as suspicious behaviour.
I can assure you that there is nothing malicious going on with CircuitBlocks, and you can tinker with your devices without fearing of infecting your PC by using the app.