piapro.jp, a website for hosting art, music, and writing related to Vocaloid, especially the Piapro Family.
Piapro Studio, the name for two distinct vocal synth software:
The original one is a plugin for digital audio workstations used for working with Vocaloids. It runs on the VOCALOID engine and is more-or-less a wrapped version of the VOCALOID software.
The newer one is a standalone engine completely separate from VOCALOID and developed by Crypton themselves.
This tag mainly refers to voicebanks using the standalone Piapro engine:
