Yes, Holygram is definitely a goth band because most of their albums belong to the Darkwave and Gothic Rock genres, which are among the core subgenres of goth music. Albums like Modern Cults, Holygram, and Acceleration (Cold Colors Remix) are examples of their goth sound.
One of the other goth artists that is similar to them is Fearing.
Holygram is located in Germany, Cologne, active in 2015 — 2020. You can find more information about Holygram on their GothDB band page.
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