Stop hunting for what changed in your drawings.

I am an architectural designer based in Tokyo. Across AEC workflows, I kept seeing teams spend too much time manually checking revised drawing sets, losing focus in the process and increasing the chance of missed changes.

I started building PDF Diff independently as part of my self-improvement effort. Using AI-assisted tools, I mapped the tool requirements and built a secure offline application to test whether the workflow could be simplified without changing how teams already work.

I validated the concept using sample drawing sets in a personal test environment. The tool performed as designed, completing comparisons locally in under 3 seconds with no external data transfer. I am publishing it as a free resource for the AEC community as part of my ongoing self-improvement research (自己研鑽).