Ohlhorst Digital is a mastering-focused audio plugin developer founded by mastering engineer Jan Ohlhorst. The plugins began as in-house tools built for Ohlhorst's own mastering work and were later refined for public release in partnership with Tokyo Dawn Labs, which handles distribution and co-development.

The product line consists of specialized mixing and mastering processors, including OD Finesse (a spectral/resonance processor), OD Ancora (a frequency-selective stereo image processor aimed at improving mono compatibility), OD Limen (a high-frequency acceleration limiter), and OD DeEdger (a tool for reducing hardness in audio signals). The plugins are available in VST, VST3, AU, and AAX formats.

The brand is oriented toward audio engineers and mastering professionals rather than general musicians, with a reputation for technically detailed, transparent processing tools.

Ohlhorst Digital has 1 product cataloged on Equipboard, including Transient Shaper Plugins.