The album's songs were recorded with Simon Wilcox, Titanic Sinclair, Chris Greatti and Ryosuke Sakai.

Poppy.Computer was written in Los Angeles during 2016 by Poppy and Titanic Sinclair, with help from songwriter Simon Wilcox and Chris Greatti of Blame Candy.

Near the end of the year, Poppy and Sinclair went to Japan to work with producers on the record, then went back in the spring of 2017 to finish it.

"[10] AllMusic's Neil Z. Yeung noted an "injection" of J-pop into Poppy's "computer veins", mentioning that the album results in a "winking piece of art pop that sounds like Fame-era Lady Gaga meets Grimes or L.A.M.B.-era Gwen Stefani going full 'Harajuku Girl[s]'", also suggesting to "think of this as the 'Material Girl' for the Internet age".

[7] Rolling Stone's Maura Johnston said that "[it] adds her airy voice to hyper-stylized, detail-rich gloss-pop", also stating that "Poppy.Computer's off-kilter recounting of microcelebrity, hiccuping vocals and intricate production help her neatly avoid that fate".