Perch Demo is an evaluation prototype of an always-on personal assistant for your phone. You chat with it, and it can read your Gmail and Google Calendar, remember things you tell it, keep track of goals, and watch web pages for changes.
It is a demo run by its developer on a single computer. It is not a commercial product and is shared only with people the developer invites to try it.
If you choose to connect Google, the app reads your Gmail messages and Google Calendar events to answer questions you ask in the chat. If you also choose "Enable sending & editing", it can send email or change calendar events, but only after you approve each action in the app.
Read the privacy policy and the terms of service before connecting an account.