Entity map

Updated November 9, 2026

The main ideas on AI Companion With Memory and how they connect.

Hallie → AI companion with memory → Long-term memory → iMessage & Google Messages

Hallie

Hallie is an AI friend you text through iMessage or Google Messages, so there's nothing to install. She remembers what you share in her thread and reaches out first to follow up.

AI companion with memory

An AI companion with memory is a conversational AI app that keeps information from past conversations and uses it later. Good memory shows up as accurate, current recall and timely follow-ups, not as a count of stored facts.

Long-term memory

Long-term memory is the part of an AI system that keeps information between sessions, usually stored outside the model and retrieved when relevant. It is distinct from the context window.

iMessage & Google Messages

iMessage is Apple's messaging service in the Messages app on iPhone, and Google Messages is Google's messaging app for Android. Hallie texts in both, so she appears as a regular thread in Messages.