Comparison
Arkon Vault vs mem0, Zep/Graphiti, and the reference memory MCP server
mem0, Zep/Graphiti, and the reference memory MCP server are memory or knowledge-graph stores for agents and applications. You run them as a hosted service, an SDK, or a local server. Arkon Vault is a hosted project-state layer for a person moving one project between ChatGPT, Claude, and Codex.
Same word, different job
Memory store, knowledge graph, or project handoff.
This page does not compare price, rate limits, or benchmark scores. Competitor pricing is omitted on purpose. Statements about mem0, Zep, Graphiti, and the reference server follow the vendor or project pages linked below.
| Question | mem0 | Zep / Graphiti | Reference memory MCP server | Arkon Vault |
|---|---|---|---|---|
| What it is | A memory layer between an application and a model, so agents can reuse facts across turns, sessions, or users. | Graphiti is an open-source temporal knowledge-graph framework for agents. Zep is a managed context layer that uses Graphiti. | A reference MCP server: a local knowledge graph so a client such as Claude can remember information across chats. | A hosted project-state layer for people moving one project between ChatGPT, Claude, and Codex. |
| What it keeps | By default, extracted facts rather than a verbatim transcript. The open-source build and the managed platform both store those memories for later search. | Entities, relationships, and facts that can change over time, including historical context for what was true. | Entities, relations, and observations in a local knowledge graph. | Vision, decisions, handoffs, the next action, and collision warnings for a project. |
| How you run it | Managed Mem0 Platform, or self-hosted open source where you operate the backing stores. | Self-hosted Graphiti, or Zep’s managed context layer. | Locally, in the MCP client process. The MCP project describes the servers in that repository as reference implementations. | Hosted at vault.arkoncybersecurity.com. Connect ChatGPT, Claude, or another MCP client. Solo is $12/month on the billing page. |
| Closest fit | An application or agent should remember facts about a user, agent, or session. | An application or agent should query a knowledge graph, including how relationships change. | You want a small local graph inside one MCP client, without operating a separate memory service. | A person should leave ChatGPT, open Claude or Codex, and continue the same project from the saved next step. |
- mem0: How Mem0 works and Platform overview.
- Zep / Graphiti: Graphiti overview.
- Reference memory MCP server: Knowledge Graph Memory Server and the MCP reference servers repository.
- Arkon Vault: product homepage, AI work continuity guide, and current plans.
When to use which
Pick the tool whose documented job you actually have.
These products can sit next to each other. Choosing one does not require rejecting the others. The split below follows the descriptions in the sources above, not a score.
Use mem0 for application memory
Use it when your own app or agent needs a memory store: add conversation turns, then search facts before the next model call. Hosted platform and self-hosted open source are both documented.
Use Zep or Graphiti for a knowledge graph
Use Graphiti when you want to build and query a temporal graph of entities and facts yourself. Use Zep when you want the managed context layer that Zep’s docs say is built on Graphiti.
Use the reference memory server for a local graph
Use the official Memory server when an MCP client should keep a simple local knowledge graph of entities, relations, and observations. Treat it as the reference implementation the MCP project says it is.
Use Arkon Vault for a cross-AI project handoff
Use it when you, not an app you are building, move one project between ChatGPT, Claude, and Codex. Vault stores the vision, decisions, handoff, next action, and collision warnings so the next AI can preflight the same project. It is not a general-purpose memory SDK.
Arkon Vault
Continue one project. Don’t rebuild the brief.
Solo is $12/month. Team is $39/month and Ops is $99/month at current catalog prices. Review the billing page before checkout. The First Five program does not promise a discount.