Spruce Effects is a San Francisco Bay Area-based builder of guitar effects pedals, based in Pacifica, California. The company custom designs and hand-builds stompboxes using vintage and rare parts, with each pedal assembled in California. Its product names draw inspiration from the natural world, reflecting a focus on fuzz and drive circuits.

The lineup includes the Lichen Fuzz Overgrowth, a flagship unit that combines a Lichen Fuzz circuit with a Growth Ring boost, and the Old Growth Fuzz, a silicon fuzz voiced after classic muff-style variations. The Giganteum Drive covers territory from subtle boost to mild drive and cranked-amp overdrive. Spruce Effects has also released DIY projects, including a Colorsound Overdriver-style clone and a Univox Super-Fuzz-style clone.

Spruce Effects has 10 products cataloged on Equipboard, including Fuzz Effects Pedals, Overdrive Effects Pedals, and Phaser Effects Pedals. Their gear is featured by 1 artist, with the strongest followings in Rock and Pop. Notable users include Sarah Lipstate.