Synthesizers.com is an American manufacturer of large-format analog modular synthesizers, founded by engineer Roger Arrick in the late 1990s and shipping its first orders around 2000. The company builds in the 5U "Moog Unit" format, offering its own line of oscillators, filters, amplifiers, sequencers, ring modulators, and quantizers, along with pre-configured cabinets and systems such as the Studio-66, Portable-22, Box-33, and Rack-24. The product line is anchored by classic-style modules like the Q106 VCO, Q107 state-variable filter, and the Q960 Sequential Controller, a Moog 960-style step sequencer reissued with modern internals.

Based in Texas, the brand is widely referred to in the modular community as "Dotcom," a shorthand that distinguishes its 5U gear from Eurorack-format makers. Its modules are designed to be physically and electrically compatible with the Moog modular tradition while using contemporary components and a symmetrical power scheme, which has made the system a common entry point for players building large patch-cord setups outside of vintage Moog or Moon Modular rigs.

Synthesizers.com has 12 products cataloged on Equipboard, including Modular Synthesizers and MIDI Keyboard Controllers. Their gear is featured by 4 artists, with the strongest followings in Electronic, Stage & Screen, and Rock. Notable users include Junkie XL, Jordan Rudess, and Nick Millhiser.