Zep vs Mem0
Temporal knowledge graphs with validity windows vs. fast vector + keyword + entity memory.
- Model
- Temporal knowledge graph
- Updates
- Timestamps valid / invalid edges
- Paid from
- $125/mo (Flex)
Where Zep wins
- Tracks when facts started and endedZep stamps every graph edge with validity dates, marking old facts invalid instead of leaving them unmarked beside new ones.
- Multi-hop graph relationshipsZep connects entities, episodes and custom schemas in a graph. Mem0 removed graph memory from open source and gates it to Custom.
- Self-serve cloud graph and connectorsZep’s $125/mo Flex plan includes its managed graph engine plus Google Drive, Slack, Notion and Gmail connectors.
- Model
- Facts + entity links
- Updates
- Append-only (ADD-only)
- Paid from
- Free (BYO key) / Custom
Where Mem0 wins
- Faster writes and simpler stackZep ingests graph episodes asynchronously and needs Neo4j or FalkorDB to self-host. Mem0 runs one LLM call over any vector DB.
- Complete self-hosted serverZep deprecated Community Edition, leaving only the Graphiti library. Mem0 ships a ready-to-run self-hosted server and UI.
- Much lower starting costZep starts at $125/mo ($375/mo for Observations). Mem0 gives 50,000 free adds/mo with your own LLM key.