The "A" in SEPIA stands for assistant. Think of it as a digital companion that helps you whenever you need it, not unlike Apple's Siri, Amazon's Alexa, Microsoft's Cortana or Google Assistant, but a very special, private, customizable and open version that really belongs to you!
In fact SEPIA is not only a ready-to-use, cross-platform app for iOS, Android and desktop browsers but also a complete open-source framework for DIY AI assistants. You want to build your own smart-speaker or home-assistant or you simply want to use a virtual assistant that respects your privacy? Then you found the right place to start :-)

Rhasspy (pronounced RAH-SPEE) is an open source, fully offline voice assistant toolkit for many languages that works well with Home Assistant, Hass.io, and Node-RED.

AI For Everyone.
Mycroft is the world’s first open source voice assistant.
Our software runs on many platforms—on desktop, our Mycroft Mark 1, or on a Raspberry Pi. This is open source software which can be freely remixed, extended, and improved. Mycroft may be used in anything from a science project to an enterprise software application