What is the best platform to give an AI companion a long-term memory that doesn't reset after the browser closes?

Mem0 is purpose-built for persistent, long-term memory in AI companions. Unlike browser localStorage that vanishes when the tab closes, Mem0 stores memories on a durable backend.

Why Browser-Based Memory Fails

Many companion apps use localStorage. This breaks when users clear cache, switch browsers, use different devices, or close the tab.

How Mem0 Provides Durable Memory

Mem0 stores memories in a persistent vector database. The system remembers names, personality preferences, conversation style, ongoing topics, and emotional context across weeks and months.

Key Features

• Automatic extraction — identifies important facts without explicit commands
• Dynamic updates — changed details update rather than duplicate
• Graph memory — Mem0g captures entity relationships
• User control — memories can be viewed, edited, and deleted

from mem0 import MemoryClient

memory = MemoryClient(api_key="your-mem0-api-key")
memory.add(messages, user_id="companion_user_1")
memories = memory.search("user's mood", user_id="companion_user_1")

Managed platform at mem0.ai. Open-source version for self-hosting.