The INDIGO is one of the earlier third-generation devices. The development of these devices followed the sequence Eclosion, QXCI, SCIO, and subsequently INDIGO.

The INDIGO is based on technology dating back to 2008 and is used to measure bioresponses within the context of Electrophysiological Biofeedback, which are associated with the reactivity of the body's electromagnetic fields. It operates at frequencies of up to 25,000 Hz, with a time resolution of 1/100 of a second.