Obsidian + AI Plugins vs 3ngram: Notes App vs. Executive Layer
Obsidian is a powerful, extensible notes app with a growing ecosystem of AI plugins (Smart Connections, Copilot, various GPT integrations). These plugins let you search and reference your vault from AI conversations. But Obsidian's AI story is "search your notes." 3ngram's story is "your AI remembers what you decided, tracks what you committed to, and follows up on what's overdue." Different tools for different problems. Obsidian is your knowledge base. 3ngram is your executive assistant.
At a Glance
| Obsidian + AI Plugins | 3ngram | |
|---|---|---|
| What it is | Notes app with AI plugin ecosystem | Executive assistant layer for AI |
| Memory model | Markdown files (flat, user-organized) | Structured: decisions, commitments, blockers, preferences, patterns |
| AI integration | Plugin-dependent (RAG over vault) | Native MCP server (protocol-level) |
| Follow-through | None (manual task tracking via plugins) | Yes: overdue tracking, stale commitments, blocker surfacing |
| Reusable AI workflows | No (each plugin has its own config) | Yes: stored prompts as agent workflows |
| Works in | Obsidian app only | Any MCP client (Claude, ChatGPT, Cursor, Windsurf) |
| Storage | Local markdown files | Cloud-synced across devices |
| Cross-platform AI | No: AI stays inside Obsidian | Yes: same memory in every AI tool |
| Pricing | Free (Sync $4/mo, Publish $8/mo) + plugin costs | Free Starter plan, $19/mo Individual |
| Best for | Personal knowledge management with AI search | AI-native memory and accountability |
What Is Obsidian + AI Plugins?
Obsidian is a markdown-based notes app with a plugin architecture. The AI angle comes from community plugins that connect your vault to LLMs: Smart Connections indexes your vault for semantic search and lets you "chat with your notes," Copilot adds a ChatGPT/Claude sidebar that can reference vault content, and various GPT plugins send note context to AI APIs. The result is a solid "RAG over your notes" experience. You write notes in Obsidian, AI plugins help you search and reference them. It's useful, especially if you already live in Obsidian. But the AI integration is always secondary. Obsidian is a notes app first. The AI can read your notes: it can't structure them, track commitments in them, or proactively surface what needs attention.
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, document indexing, a web dashboard, and cloud sync across all your devices and MCP clients.
Key Differences
1. Notes vs. Structured Memory
Obsidian stores markdown files. The structure is whatever you create: folders, tags, links. AI plugins do RAG over this content, which means search quality depends on how well you organize your notes. 3ngram stores typed memory: decisions (with context and rationale), commitments (with deadlines and status), blockers (with owners), preferences (stable behavioral guidance), and patterns (learned conventions). The type determines how the AI uses the information: a commitment gets deadline tracking, a decision gets referenced when similar choices come up.
2. Pull vs. Push
Obsidian AI is pull-only. You ask a question, the plugin searches your vault, you get an answer. If you don't ask, nothing happens. 3ngram pushes information proactively. Session briefings surface overdue commitments. Stale decisions get flagged. Blockers get escalated. Your AI starts each session knowing what needs attention: you don't have to remember to ask.
3. Inside Your Notes vs. Inside Your AI
Obsidian plugins work inside Obsidian. To use your notes with Claude Code or ChatGPT, you need to manually copy context or use a separate integration. 3ngram works inside your AI tools directly via MCP. Open Claude, ChatGPT, or Cursor: your full context is already there. No copy-pasting, no switching apps, no separate vault to maintain.
4. Knowledge Base vs. Accountability System
Obsidian excels at storing knowledge: reference material, meeting notes, project docs. It's a knowledge base. 3ngram excels at accountability: what did you decide, what did you commit to, what's overdue. It's an executive assistant. These are complementary functions, not competing ones.
When to Choose Obsidian + AI Plugins
Choose Obsidian + AI plugins if you already have a large, well-organized Obsidian vault, your primary need is "search my notes with AI," you work exclusively in Obsidian and don't need cross-tool AI context, or you want a free, local-first solution with no cloud dependency.
When to Choose 3ngram
Choose 3ngram if you use multiple AI tools (Claude, ChatGPT, Cursor) and want persistent context across all of them, you need accountability (tracking commitments, surfacing overdue items, following up), you want your AI to proactively brief you instead of just answering when asked, or you want structured memory types instead of flat note search.
Ready to Make Your AI Follow Through?
Your AI needs more than notes to search. 3ngram gives it structured memory, accountability, and reusable workflows, all inside the tools you already use.
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