Phidler is a desktop application to simplify photonic integrated circuit (PIC) design and simulation. It provides a user-friendly interface for designing PICs, running simulations, and visualizing results, making it easier for researchers and engineers to build photonic devices. A key feature of Phidler is that instead of generating GDS files directly, it generates a GDSFactory-based Python script that can be run to generate the GDS file, allowing for easy integration with other software and workflows. It also includes a command-line interface (CLI) for advanced users who prefer to work in a terminal environment, as well as a Claude code integration (synchronized with the aoftware undo/redo stack) to streamline creation of more complex circuits.