Valhalla DSP is a Seattle-based audio plugin company founded in 2009 by Sean Costello and Kristin Costello. Sean, who studied computer music at Stanford and spent years working in audio DSP design, handles plugin development, while Kristin manages graphics and marketing. The company has built a reputation for producing high-quality algorithmic reverb and delay plugins with clean, intuitive interfaces, all sold at a flat $50 per plugin with no bundles or discounts.

The Valhalla DSP product line includes VintageVerb, which recreates the character of late 1970s and 1980s digital reverb units; Plate, offering 12 algorithms simulating plate reverb and small chamber sounds; Room, designed for realistic room and hall acoustics; Shimmer, combining reverberation with pitch shifting; Delay, covering vintage tape, bucket brigade, and digital delay styles; ÜberMod, a modulation-heavy delay and reverb hybrid; and FutureVerb, the result of eight years of R&D featuring eight reverb modes and twelve echo modes. The company also offers three free plugins — Supermassive, a widely popular delay and reverb tool suited to massive ambient spaces; Freq Echo, a delay with frequency shifting; and Space Modulator, a flanging and modulation effect.

Valhalla DSP plugins have been used on records by artists including Adele and Lana Del Rey, and are widely regarded as go-to tools among producers and mix engineers across genres. The plugins are available in VST, VST3, Audio Units, and AAX formats.

Valhalla DSP has 9 products cataloged on Equipboard, including Delay Plugins, Modular Synthesizers, and Reverb Plugins. Their gear is featured by 153 artists, with the strongest followings in Electronic, Pop, and Rock. Notable users include Fred again.., Andrew Huang, and Pegboard Nerds.