Photizon — Free Online Optical Coating Simulator

Photizon — Free Online Optical Coating SimulatorDesign and simulate thin-film optical coatings in your browser. Photizon is a free, web-based multilayer coating calculator powered by the transfer matrix method (TMM).Features

Real-time spectral plots — reflectance, transmittance, and absorbance vs. wavelength

Interactive layer stack builder with drag-and-drop reordering

Material database — MgF2, SiO2, TiO2, Al2O3, Si3N4, Ag, Au, Al, BK7

Design templates — single-layer AR, V-coat, broadband AR, Bragg mirror, bandpass filter, metal mirror

Quarter-wave optical thickness (QWOT) calculator with design wavelength control

URL sharing — share your coating design with a link

Comparison mode — pin reference spectra and compare designs

No signup required. No software to install. Just open photizon.com/simulator and start designing.Built for optical engineers, thin-film researchers, and photonics students.