Spline Laboratories is a boutique Canadian effects pedal builder that assembles gear in small, limited batches. The company describes its focus as creating "naturally aspirated audio devices" — a philosophy emphasizing organic, tactile signal processing.

Their flagship product, the Cathedral, is a three-mode fuzz and overdrive pedal developed in collaboration with producer and guitarist Josh Ang. The design draws from the circuit lineage of the Hyperfuzz and the Boss HM-2, offering two distinct fuzz voices alongside a boost/overdrive mode capable of chainsaw-style distortion. A GLARE control introduces an octave-up effect with natural gating characteristics, while the LEVEL control provides over 20dB of headroom. The Cathedral has been released in limited colorways including red and chrome variants, and sells through boutique retailers such as Cult FX as well as the secondary market on Reverb.

Because each batch is hand-assembled in Canada in small quantities, availability has historically been limited. The Cathedral has attracted attention among players seeking heavy, aggressive fuzz tones in the boutique pedal space.

Spline Laboratories has 2 products cataloged on Equipboard, including Fuzz Effects Pedals and Overdrive Effects Pedals. Their gear is featured by 4 artists, with the strongest followings in Rock, Metal, and Pop. Notable users include hunnybite, IV, and Jesse Doreen.