❌ – Bundled Arduino 1.8.x is old (current is 2.x). Missing new boards, libraries, and features like the built-in debugger.
❌ – Large sketches with many virtual components can slow simulation significantly. Proteus 8.9 Sp2 Professional With Arduino 1.8 UPD Free
✅ – Includes thousands of analog/digital parts, plus virtual instruments (oscilloscope, logic analyzer, SPI/I²C debugger). ❌ – Bundled Arduino 1