In Decay is a compilation album by American electronic musician Seth Haley's project Com Truise, released on July 16, 2012, by the independent record label Ghostly International.

These early tracks, some of which were produced before the release of his debut EP, Cyanide Sisters (2010), showcase Haley exploring an electropop funk music sound that would later come to define Com Truise.

"[1] In Decay maintains the same electropop funk music structure that consists of 1980s synthesizers, tough bass sounds, and science fiction elements as Com Truise's previous releases.

[5] Ghostly's press release explained that the compilation features Haley exploring parts of this sound, such as "8-bit influenced experimentalism" and "distinctly danceable beats.

"[7] Some tracks on In Decay are slow-tempo, calm-vibe dance songs, while others are extraterrestrial psychedelic cuts similar to the works of Tangerine Dream and Popol Vuh.

[7] Patric Fallon of XLR8R highlighted In Decay's experimentation absent from the normal output of the Com Truise project; examples include the minimal music structure of "Yxes" and the use of live bass guitar on the songs "Alfa Beach" and "Dreambender.

critic wrote, "[Haley's] sonic ideas are circular lines constantly spiralling into themselves ― simple, looped melodies, a flourish here, a hazy sample there, lather, rinse, repeat ― but there's very little difference in tone to keep your attention.

"[12] Gaerig, who called the album's songs "deceptively underdeveloped," "too dull and passive to threaten," said it "baubles, pure sonic fetishes that that fail to provoke discernible imagery or mood beyond a noirish appreciation for the oscillators of Christmas past.

In 2022, Sam Willings wrote to MusicTech that In Decay "has genuinely become a synthwave classic that's been enjoyed tens of millions of times and has influenced a plethora of artists", arguably becoming Com Truise's most celebrated project.