Capsule Audio is a virtual instrument developer behind Capsule, a sample-based plugin and sound-library subscription service for macOS and Windows in VST3 and AU formats. The company's central product, the Capsule player, condenses its sound engine into eight macro controls and loads individual sound packs — called Capsules — each containing up to 64 chromatically playable instruments designed around a specific sonic theme. Users can access the full library through a monthly subscription or purchase individual Capsules outright.

The catalog spans a wide range of instrument categories, from orchestral strings (Arco Solista, Arco Ensemble, Retro Strings, Heart String) and choral textures (Sanctus) to acoustic guitar (Nova Strum), winds (Zephyr), and modern electronic sounds (Neon, Nightfall, Onyx, Polychrome). Percussion and specialty packs such as Thunderdome and Lamelle round out the library.

Capsule was originally launched under the Soundslates brand and is positioned as a cloud-synced sound library for producers looking for ready-to-play, macro-driven instruments without diving into deep synthesis programming. It is often compared to products like Output's Arcade and Native Instruments' Kontakt-based libraries.

Capsule Audio has 18 products cataloged on Equipboard, including Virtual Instrument and Instrument Bundles.