Black Rainbow Sound was met with "generally favorable" reviews from critics. At Metacritic, which assigns a weighted average rating out of 100 to reviews from mainstream publications, this release received an average score of 75, based on 8 reviews.[2] Aggregator Album of the Year gave the release a 73 out of 100 based on a critical consensus of 11 reviews.[7] Nick Roseblade from Clash Magazine said of the album: "[the album] shows a band in flux. The songs sounds bigger and more articulated. Menace Beach are using a larger musical palate and it mostly works, swapping the messy surf guitars and charming slacker vibes while allowing the songs to speak for themselves.[4]