Musically, Knower Forever diverts from the duo's four previous albums, featuring an experimental sound with avant-pop and jazz-funk whilst continuing their theme of humorous and vulgar lyrics.

Unlike their four previous albums which were produced exclusively by the duo, Knower Forever features performances and production from several musicians including Binney, Gendel, Thistlethwayte and Wilkes.

Zoe Camp of Bandcamp Daily ranked Knower Forever among their best albums of the year, believing the duo "are certainly at home basking in muzak's creature comforts, from the hermetically sealed vocals of city pop to the tonal warmth of smooth jazz.

[10] Writers of Song Bar called the record a "jazz-funk tour de force LP of outstanding musicianship, infinite energy, humour and invention", and praised the duo and supporting band.

[17] Tony Wolski of The Armed called Knower Forever one of his favorite albums of the year, stating that "It’s no secret that Louis Cole is an absolute force on drums.