The short answer up front: there is no best agent memory tool. These six projects solve genuinely different problems that happen to share the word "memory," and picking between them by star count or a leaderboard screenshot is how teams end up running a temporal knowledge graph to store "user prefers dark mode."
I am Edward, co-founder of Mnemoverse. One of the six tools below is mine, so read this whole piece knowing that. I have tried to handle the bias the way I would want a competitor to: my product gets one section among equals, and I tell you when not to pick it.
This is a map, not a ranking. For each tool: what it actually is, the job it wins, and when you should walk past it.
Mem0: extracted facts, open-source SDK, managed option
What it is: an Apache-2.0 open-source memory SDK with a managed cloud on top. Its core move is fact extraction: it distills conversations into discrete facts it can recall in later sessions.
