Relab Development is a Danish audio software company founded in 2006, specializing in digital recreations of classic professional studio hardware. The company is known for its reverb plug-ins, including the LX480 Dual-Engine Reverb (a detailed emulation of the Lexicon 480L), the VSR REV6000, the Sonsig Rev-A algorithmic reverb, and the Q82 natural resonance reverb.

Beyond reverb, the catalog extends to dynamics and tone-shaping tools such as the Relab 176 tube compressor, the Color Drive saturation plug-in, and licensed emulations of Leif Mases' Maselec mastering hardware (the MLA-4 triband compressor and MEA-2 stereo EQ). Most flagship titles are also offered in pared-down Essentials editions aimed at project-studio users.

Relab's plug-ins are distributed in VST, AU, and AAX formats and are sold directly as well as through retailers like Plugin Boutique and Sweetwater. The company markets its work around faithful modeling of vintage digital and analog units rather than original designs.

Relab Development has 10 products cataloged on Equipboard, including Reverb Plugins, Stereo Width Plugins, and Dynamic Processor Plugins.