Second is a private personal model that lives and grows on your device. It builds a deep understanding of you: who you are, what matters to you, what you've committed to, and what you're trying to do.
It draws on context from your life and work, developing a general model of you that updates continuously. You can ask Second about the past, think through the present, and explore what comes next. Second can also suggest before you ask, and then act with your permission.
You can also make this deep understanding of you available to other AI tools, helping them respond with an understanding of your background and intent.