The defining feature of 123D Circuits was its real-time, mixed-signal simulation. Powered by a cloud-based SPICE (Simulation Program with Integrated Circuit Emphasis) engine, the tool allowed users to build circuits on a virtual breadboard and simulate them instantly.
As the maker market matured, Autodesk realized they had two overlapping products: autodesk 123d circuits
As part of the Autodesk 123D ecosystem, the software allowed users to export their PCB designs as 3D models. This was a critical feature for makers using 3D printers, as it allowed them to ensure their electronic components would fit inside custom enclosures designed in 123D Design or Tinkercad. The defining feature of 123D Circuits was its
By 2018, the original 123D Circuits website (circuits.io) was redirected to Tinkercad. Existing user projects were migrated, but many advanced features were gone. The community mourned—the "pro-sumer" sweet spot was lost. This was a critical feature for makers using