This is rough webApps port of Tri-Bahtinov Mask generator.
Discussion on cloudy nights.
Programmed by Satoru Takagi.
You may be interested in a version with improved sensitivity. 7/15/2018
Also, original Bahtinov mask pattern generator is available. 12/15/2020
Download using upper buton or copy following source text and save as [maskName].svg using text editor, and open it by inkscape.