Sly-Fi Digital is a California-based audio plugin company founded by Gregory "UBK" Scott, the engineer and designer behind Kush Audio. Positioned as a sister brand to Kush, Sly-Fi focuses on plugin emulations of heavily modified vintage analog hardware, leaning into darker, warmer, and dirtier tones rather than clinical accuracy. The brand's tagline — "Darker. Warmer. Digital." — captures its preference for colored, character-driven processing aimed at mix engineers.

The initial product lineup centers on three plugins known collectively as the OG Trifecta: the Deflector, a compressor modeled on a modified Empirical Labs Distressor routed through Ampex tape saturation; Axis, a three-mode EQ based on the API 550A and 550B; and Kaya, a saturation/distortion unit derived from an old Ampex tube tape deck with its preamp hardwired to the tape head. The plugins are also sold in bundles such as the OG Trifecta and Crush & Bend, and are available through a subscription alongside Kush Audio's catalog.

Sly-Fi has 2 products cataloged on Equipboard, including Compressor Plugins and FX Bundle Plugins. Their gear is featured by 1 artist, with the strongest followings in Electronic. Notable users include Lenno.