ARTICLEDEV.to AI·4/15/2026
How I'd Design a Memory System for an AI Companion App
The author spent 200 days testing 15 AI companion apps, identifying persistent, cross-session memory as the single biggest differentiator where most apps fail. He proposes a three-layer memory system to address this, acknowledging that LLMs inherently lack memory and rely on prompt stuffing, with the first layer being a database for every message.
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