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● vcn #33 widget · wing iii · sortable

SAME PROBLEM, FOUR SHAPES.

Four substrates for "remember things across sessions." Click a column header to sort. The setup-time and substrate columns reveal that these are not interchangeable; each one bets on a different primitive. The footer carries the verbatim positioning quote each framework's team uses.

framework substrate storage model setup time↑ best for lab
verbatim positioning · sourced from each project's own docs
  • Zep / Graphiti
    Zep tracks memory in temporal edges where the graph owns the truth about when a fact was valid (per valid_at and invalid_at in graphiti_core.edges.EntityEdge), so retrieval is correct when you need temporal reasoning.
    graphiti_core/edges.py::EntityEdge
  • Letta
    Letta's three-tier memory model: Core (always-on), Recall (conversation history), Archival (external corpus), gives agents a runtime that explicitly separates working memory from long-term storage.
    letta.com/blog/agent-memory
  • Mem0
    Mem0 wraps vector + graph + reranker behind a managed memory API, so a builder gets "remember this" in one line of code rather than three weeks of glue.
    mem0/mem0 README + docs
  • CLAUDE.md
    A markdown file Claude Code automatically loads into context on every session, encoding the procedural rules of the project: commands, conventions, gotchas.
    anthropic claude code docs · CLAUDE.md spec