Apps similar to Velxio include KiCad, which is free and open source. Other options are Fritzing, Wokwi Arduino Simulator, avr8js and Mokxi. In total there are six Circuit Simulators like Velxio for Windows, Linux, Mac, Android and iPhone.
KiCad is an open source software suite for electronic design automation (EDA) - designing schematics of electronic circuits and printed circuit boards (PCB). KiCad is developed by Jean-Pierre Charras. And features an integrated environment between schematic capture, bill of...
Open-source initiative aiding designers, artists, and researchers in transforming prototypes to actual products, documenting circuits, sharing, teaching, and PCB manufacturing.
A web-app you can use to simulate circuits as well as run Arduino sketches right in the browser, using the open-source AVR8js platform.
Israel
Mokxi is a free electronics simulator that runs in your browser. Build and run Arduino, ESP32, Pi Pico and STM32 circuits, with no installs or hardware needed to start.
CRUMB is an immersive interactive 3D Circuit Simulator that can be used as a learning educational tool or a prototype workspace for electronic development.
