Zep vs Mem0 vs Postgres: Buy the Memory Store Last
At 10,000 users, Postgres with pgvector costs $163-$332 a month against Zep's $375-$750 and Letta's $1,020 — and no independent party has confirmed that a commercial memory store retrieves better. Buy one when you can name the column you could not write yourself.
September 19, 2026 · 17 min read