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Persistent memory for every AI tool
v2.0.0 · MIT
Your AI shouldn’t
start from
zero
Second Brain gives Claude, ChatGPT, Cursor, and every MCP-compatible tool a shared continuity layer, so your projects, decisions, and context follow you across every session.
No re-explaining. No copy-paste. Just continuity.
One continuity layer for every AI tool you use.
If it speaks the Model Context Protocol, it plugs in. One Worker URL, every tool.
The problem isn’t that AI lacks memory. The problem is that every tool starts over
Every new conversation, you re-paste context. The tech stack. The architecture decisions. What you agreed on last Thursday. The file structure. The naming conventions. Again. And again.
The model is brilliant in the moment and completely blank at the start of the next session. You burn ten minutes per chat re-establishing context that should already exist.
Built-in memory features are black boxes. You can’t search them. You can’t audit what’s stored. You can’t export them. You can’t control when they trigger. They occasionally remember the right thing. Mostly they don’t.
Second Brain is different. It’s a memory layer you actually control — searchable, exportable, self-hosted, and yours.
Up and running in three steps
Download the app
Grab the desktop app for Mac or Windows. Cloudflare provisions your D1 database, Vectorize index, and Worker behind the scenes. Nothing to configure.
Connect your tools
Paste your Worker URL into Claude Desktop, Claude Code, claude.ai, Cursor, or any MCP-compatible client. One URL, every tool.
It remembers
Context gets stored automatically as you work. At the start of each new session, the relevant parts surface. You stop re-explaining. Forever.
See it in action
Watch the same question asked across ChatGPT, Claude, and Cursor — all returning consistent answers thanks to Second Brain.
Not just memory. Understanding that compounds.
Second Brain doesn’t just store what you tell it — it synthesizes, resolves conflicts, and surfaces patterns you never explicitly wrote down.
AI Synthesis
Ask “what did I decide about the pricing model?” and get a direct answer — not a dump of raw entries. Supporting memories shown below if you want them.
Pattern Derivation
Second Brain scans your memories after every recall and surfaces recurring themes you never wrote down. “You revisit this tradeoff every quarter.” Derived, not told.
Semantic Recall
“Users dropping off at checkout” surfaces when you search “conversion problems.” Meaning-based retrieval — no exact match, no tagging required.
Smart Merge
When two memories conflict or overlap, Second Brain resolves them — merging near-duplicates, auto-correcting contradictions. Context stays clean over months.
Importance Scoring
Every memory gets an AI score at capture. Frequently recalled entries rank higher over time. Ask “what was I building last Tuesday?” and get the right moment.
Universal MCP
Claude, ChatGPT, Cursor, Windsurf — every MCP-compatible client shares the same memory layer. One deployment, one brain, every tool you use.
Web Dashboard
Browse by date, filter by tag, edit memories in place. Export everything to JSON or Markdown. Full visibility into what your AI knows — no CLI needed.
Self-Hosted
Runs entirely on your own Cloudflare account. No vendor touches your data. Covered by the free tier — no credit card, no lock-in.
Your brain never contradicts itself.
Most memory tools accumulate. Second Brain reconciles. Every new memory is checked against what’s already stored — conflicts get resolved, near-duplicates get merged, stale beliefs get replaced.
“Based in New York — not planning to move anytime soon.”
“Moving to Lisbon in March. Remote made it possible, cost of living did the rest.”
“Moving to Lisbon in March. Remote made it possible, cost of living did the rest.”
Contradiction Detection
Every incoming memory is semantically compared against existing ones. When two beliefs conflict, Second Brain flags it and auto-resolves to the newer truth — without you having to manage it.
Smart Merge
Near-duplicates in the 0.85–0.95 similarity band go through an LLM prompt that decides: keep both, replace, or merge into a single coherent memory. Nothing accumulates blindly.
Hard Duplicate Block
Exact or near-exact matches (≥0.95 similarity) are blocked before storing — no LLM call, no overhead. Your brain stays dense, not bloated.
A full UI at your Worker URL.
No separate service. No extra deploy. Open your Worker URL in any browser — auth is handled client-side, your token lives in localStorage.
Recall
Semantic search across your whole brain — not keyword matching. “payment drop-off” finds “users abandoning checkout”. Each result shows match score, tags, source, and timestamp.
Recent
Every entry in reverse chronological order. Filter by tag to review what you stored under work or decision this week. Append updates or forget entries inline.
Remember
Type a note and hit save. Drop #tags anywhere in the text — the UI strips them and stores them as tags. Works from your phone browser too.
Extend your Second Brain
Capture context — wherever you are, whatever you’re using.
Second Brain CLI
Capture and recall from your terminal. Pipe meeting notes, grep output, or anything else straight into your brain — no copy-paste required.
Obsidian Plugin
Turn your entire Obsidian vault into AI context. Sync everything or just tagged notes, with auto-sync on save and a built-in sidebar for searching your brain without leaving the app.
iOS Shortcuts
Capture thoughts the moment they hit. Voice memo while walking, a quick text note, or save from any app’s share sheet — straight to your AI’s memory.
Second Brain vs. the alternatives
The popular memory tools each ask for a trade-off — your data on their cloud, a usage meter, or one machine only. Second Brain doesn’t.
Built entirely on Cloudflare’s free tier
No credit card required for personal use. Schema auto-creates. You own every byte.
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d1 · vectorize · workers ai