In Yerushalyaim it is common to find minyanim saying it. Furthermore, t is the official practice of the Mir yeshiva to say tom kippur koton. Although the minhag is not widespread being that is something that was practiced by exceedingly righteous as its source is in kabbala

In Yerushalyaim it is common to find minyanim saying it. Furthermore, it is the official practice of the Mir yeshiva to say Yom Kippur Koton.

Although the minhag is not widespread being that it is something that was practiced by exceedingly righteous as its source is in kabbala