Nine of Swords Effects is a boutique guitar pedal builder based in Leicester, United Kingdom, founded by Jonathan. The company specializes in transistor-based fuzz and distortion circuits, hand-assembling each unit in small numbers and shipping worldwide. Its aesthetic leans toward heavy, abrasive, and intentionally unfriendly tones rather than transparent or polished voicings, with branding that draws on occult and tarot imagery.

The lineup is built largely around fuzz and high-gain dirt, including the Tyrant silicon fuzz, the Headache (a take on the Harmonic Percolator circuit), the Burial At Sea fuzz, the Twin Earth Deluxe fuzz, the Hand of God, the Alter, the Funeral Party distortion, and the Satanic Fuzz Ritual. The brand also operates under the Audio Destruction tagline used in its domain and product imagery, and its pedals have been distributed through outlets such as The Fuzz Shack and Reverb in addition to direct sales.

Nine of Swords has 8 products cataloged on Equipboard, including Fuzz Effects Pedals and Overdrive Effects Pedals. Their gear is featured by 2 artists, with the strongest followings in Electronic, Rock, and Pop. Notable users include James Kennedy and Nasty Nate Clark.