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Compare MCP servers

Compare scores, permissions, risks, and fit in one decision-focused table.

DimensionSecond BrainOne memory layer, every AI tool.CompartmentEncrypted, fully offline long-term memory for AI agents
FMRS57 / 100 · C75 / 100 · B
Reliability5 / 2012 / 20
Security and permissions10 / 2016 / 20
Maintenance14 / 2014 / 20
Documentation15 / 2018 / 20
Setup experience13 / 2015 / 20
Best for
  • Individual users needing shared persistent memory across multiple AI tools.
  • Developers who want to self-host a memory layer on Cloudflare's free tier.
  • Users prioritizing data privacy and control, as data stays in their own cloud account.
  • Users wanting a quick setup with complete ecosystem support (desktop app, CLI, extensions, etc.).
  • Individuals or teams who prioritise privacy and offline operation and do not want data leaving the machine
  • Users who share memory across multiple MCP clients such as Claude Code, Claude Desktop, Hermes Agent, OpenClaw, Cursor, Codex and Gemini CLI
  • Scenarios that need encrypted storage, a hash-chained audit log and verifiable vault migration
  • Users who want low-latency recall, a bundled embedding model and no extra LLM calls inside the memory layer
Not for
  • Teams needing collaborative memory (currently single-user design).
  • Users wanting zero technical setup without touching Cloudflare (except desktop app).
  • Users requiring offline or local-only memory (depends on cloud services).
  • Strict compliance environments that require non-cloud infrastructure.
  • Users who need cloud multi-device sync or a hosted team memory service; moving between machines means locking the vault and copying the file
  • Users who expect the server itself to run an LLM that extracts facts and decides what to remember; Compartment explicitly keeps no LLM inside and leaves that to the host model
  • Users who cannot keep a passphrase safe or who need a recovery path if it is lost, since Compartment never generates a password, seed or recovery phrase
  • Deployments that require network transports such as SSE or streamable-http; this server is stdio only and opens no ports
Required permissions
  • Requires a Cloudflare account to deploy the Worker and infrastructure.
  • Requires an AUTH_TOKEN (or password) to authorize all clients.
  • Supports OAuth 2.0 dynamic client registration; clients do not need to embed the token in configs.
  • For calendar, email, and Notion integrations, requires iCal links, app passwords, or Notion connection secrets.
  • Read and write the vault file under the user's home directory, by default ~/.compartment/memory.vault, and its sibling settings file
  • Access the session directory holding the unlock credential (configurable with COMPARTMENT_SESSION_DIR), which also carries the shared embedding process's Unix socket
  • Optionally use the macOS keychain (compartment unlock --keychain is an explicit opt-in, and it survives reboots)
  • Write or merge an mcpServers entry into each MCP client's own configuration file, taking a byte-exact backup first
  • Install a PostToolUse hook for Claude Code that captures memory files the agent writes
  • Serve a read-only dashboard on 127.0.0.1 behind a one-time random URL token
Risks and side effects
  • Self-hosting means you are responsible for maintenance and updates.
  • Data is stored on Cloudflare, subject to Cloudflare's privacy policy (though within your own account).
  • Free tier may have usage limits (e.g., vector index size).
  • If you forget your password, you must log into Cloudflare to reset; you might temporarily lose access to memories.
  • Deploying with incorrect parameters (e.g., Vectorize dimensions) can degrade search functionality.
  • A leaked passphrase means the encrypted content can be decrypted; Compartment generates no recovery phrase and cannot recover a lost passphrase
  • Enabling the memory_unlock tool places the passphrase in the model's context, which is why it is off by default
  • If a 2FA keyfile is lost, for example a USB stick, the vault cannot be opened even with the passphrase
  • `export --plaintext` writes the vault as unencrypted JSONL, so that file must be handled carefully
  • Memory content can come from untrusted sources; recall wraps memories with a notice that they are stored data and content can be marked quarantined, but the host agent must still treat memory as data to limit prompt-injection risk
  • The capture hook and client integration write into the user's own settings files, although the implementation backs up and merges rather than replacing
Supported clientsClaude, ChatGPT, Cursor, CodexClaude Desktop, Claude Code, Hermes Agent, OpenClaw, Cursor, VS Code, Codex, Gemini CLI, Cline, Roo Code, Zed, OpenCode, LM Studio, AnythingLLM, BoltAI, Goose, Kiro
Tools814