Memorymoon is a software synthesizer developer that produces virtual instrument plugins emulating classic analog hardware synths. The company's catalog centers on three titles: the ME80, a Yamaha CS-80-inspired polysynth; the Messiah, a Sequential Prophet-5-style emulation; and the self-titled Memorymoon, which draws on the Moog Memorymoog. The plugins are built in SynthEdit using a custom engine and ship with large factory patch libraries and expansion banks.

The project is closely associated with UK-based programmer Chris Kerry, who developed the underlying CK_Engine used across the products, with patch design work contributed by Robin Grinnall and Paul Roach. Releases have historically targeted Windows via VST, with later versions such as Messiah 2.0 adding macOS support. Memorymoon operates as a small, independent developer rather than a large plugin house, with community support handled through its official user forum.

Memory Moon has 1 product cataloged on Equipboard, including Synth Plugins. Their gear is featured by 1 artist, with the strongest followings in Electronic. Notable users include Tycho.