claude-mem vs 3ngram: Open-Source Plugin vs. Full Executive Layer
claude-mem is a popular open-source Claude Code plugin that auto-captures session context into a local database. It's a great first step toward persistent memory, but it stores flat, untyped observations with no structure or follow-through. 3ngram gives your AI structured memory types, accountability tracking, reusable agent workflows, document indexing, and cloud sync across all your devices. claude-mem is a notepad. 3ngram is an executive assistant.
At a Glance
| claude-mem | 3ngram | |
|---|---|---|
| What it is | Open-source Claude Code plugin | Executive assistant layer for AI |
| Memory model | Flat, untyped observations | Structured: decisions, commitments, blockers, preferences, patterns |
| Capture method | Auto-captures everything (6 lifecycle hooks) | Intentional + auto: you control what matters |
| Follow-through | None | Yes: overdue tracking, stale commitments, blocker surfacing |
| Reusable workflows | No | Yes, stored prompts as agent workflows |
| Document indexing | No | Yes: GitHub, files |
| Works in | Claude Code only | Any MCP client (Claude, ChatGPT, etc.) |
| Storage | Local SQLite + ChromaDB | Cloud-synced across devices |
| Cross-device | No, local only | Yes |
| Web dashboard | No | Yes |
| Pricing | Free (open-source) | $19/mo |
| Best for | Claude Code devs wanting basic persistence | Professionals wanting AI accountability |
What Is claude-mem?
claude-mem is a community-driven open-source plugin for Claude Code that hooks into 6 lifecycle events (SessionStart, PostToolUse, Stop, etc.) and auto-captures observations into a local SQLite + ChromaDB database. It injects compressed context into new sessions via CLAUDE.md. It's well-built, trending hard on GitHub (21K+ stars), and solves a real problem: Claude forgetting everything between sessions. The token-efficient 3-layer progressive disclosure pattern is clever engineering. But it's fundamentally a capture-everything-and-compress system. Every observation is the same type. There's no structure, no lifecycle, no accountability.
What Is 3ngram?
3ngram takes a fundamentally different approach. Instead of capturing everything and hoping the AI finds what's relevant, it classifies memories into semantic types (decisions, commitments, blockers, preferences, patterns, context), each with its own lifecycle and behavior. A commitment has a due date and gets surfaced when overdue. A blocker gets flagged when it's relevant to what you're working on. A decision is retrievable when you need to remember why you made a choice. This isn't just memory; it's structured intelligence. On top of that, 3ngram adds reusable agent workflows (stored prompts that run as multi-step agents), document indexing, a web dashboard, and cloud sync across all your devices and MCP clients.
Key Differences
1. Capture Everything vs. Capture What Matters
claude-mem records every observation from every session. This creates noise. Important decisions get buried alongside routine file edits. 3ngram lets you be intentional about what gets stored and how it's classified. When something is a commitment, it's stored as a commitment with a due date, status, and lifecycle. When something is a preference, it's stored as a preference that informs future sessions.
2. Claude Code Only vs. Everywhere
claude-mem is a Claude Code plugin. If you use Claude.ai, ChatGPT, or any other MCP client, it doesn't work. 3ngram is an MCP server that works across Claude Code, Claude.ai, ChatGPT, and any MCP-compatible tool. Your memory travels with you.
3. Local-Only vs. Cloud-Synced
claude-mem stores everything locally. Switch laptops, and your memory doesn't come with you. 3ngram syncs across devices. Start a conversation on your desktop, continue on your laptop: same memory, same context, same accountability.
4. Memory-Only vs. Memory + Workflows + Documents
claude-mem does one thing: session memory capture. 3ngram adds reusable agent workflows (run a stored competitor-research prompt and get a full report), document indexing (search your GitHub repos and files from within chat), and a web dashboard for managing everything.
When to Choose claude-mem
Choose claude-mem if you only use Claude Code, want zero cost, and are happy with basic session-to-session context continuity. It's a solid open-source tool for developers who want their Claude Code sessions to have some persistence.
When to Choose 3ngram
Choose 3ngram if you want your AI to go beyond remembering, to actually track commitments, surface what's overdue, run reusable workflows, and maintain structured intelligence across every tool and device. The $19/mo pays for itself the first time your AI reminds you about a commitment you forgot.
Ready to Make Your AI Follow Through?
claude-mem gives Claude a notepad. 3ngram gives it an executive assistant. Structured memory, accountability, reusable workflows, and cross-device sync, all inside the tools you already use.
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