Second brain software
Second brain software for the AI era.
Your notes, voice memos, links, and AI chats become one context layer every tool reads over MCP — Claude today, ChatGPT tomorrow, without pasting a line.
Free — no invite needed.
AI Context Layer
Captures become people, projects, topics, and context your AI tools can read.
The shift
AI changed what people mean by second brain.
The old promise was recall: save an idea, find it later. The new promise is leverage: your next Claude or ChatGPT session opens already knowing what you decided — no recap, no paste.
You worked it out with Claude on Monday. Thursday, in a fresh chat, you're re-explaining the whole thing from scratch. Stash keeps the human part simple: stash anything worth keeping — it builds the people, projects, and connections underneath.
How Stash works
Capture first. Organization follows.
A second brain fails when maintaining it becomes the work. Stash is built around the opposite motion.
01
Capture
Text, voice, screenshots, links, emails, files, and AI threads all land in one place.
02
Understand
Stash extracts the people, projects, companies, topics, and relationships you mention.
03
Synthesize
Living wiki pages emerge from your captures, with source trails back to the original moments.
04
Connect
Claude, ChatGPT, Cursor, Codex, and other MCP clients can read from and write back to Stash.
Product shape
Your second brain becomes something your AI can read.
It's not another folder you maintain. It's the context your next Claude session, your next Cursor project, and your next ChatGPT question all start from — ask it anything, mid-task, and it answers from what you already captured.
Voice memo
The Q3 planning thread connects to the pricing memo and the board deck...
Saved article
AI agents need long-lived context outside the chat session.
Claude conversation
Decision: position the product around context portability, not note-taking.
Topic
AI Context Portability
Stash identifies a recurring thesis across planning notes, AI conversations, and saved links: durable context should live outside any one model or chat product.
Sources
18
People
7
Projects
4
"The best AI changes. Your context should not."
Why it's different
Built for retrieval by you and by your tools.
Traditional second brain
- Manual folders, tags, databases, and backlinks.
- Useful when you remember where you put something.
- Your AI's built-in memory is trapped in that one app — switch models and you're a stranger again.
- AI context still gets copied and pasted by hand.
Stash
- Claude wrote it, ChatGPT read it — the same context, no copy-paste, over MCP.
- Captures stay messy; Stash builds the structure.
- Search works by meaning, people, projects, and relationships.
- Wiki pages synthesize what you've accumulated.
FAQ
Second brain questions, answered.
What is second brain software?
Second brain software is a personal knowledge system for capturing ideas, notes, references, and decisions so they can be found and reused later. Stash takes that idea further by making the knowledge usable by AI tools too.
Is Stash a notes app?
It can hold notes, but the center of gravity is broader: voice memos, screenshots, links, files, emails, and AI conversations. Stash turns all of that into a searchable, synthesized knowledge base.
Why does AI change second brain software?
AI makes stored knowledge active. A saved decision, meeting note, voice memo, or article is no longer just something you might personally search for later. It can become working context inside the AI session where you are writing, planning, deciding, or building.
How does Stash work with AI tools?
Stash speaks MCP — the open standard Claude, ChatGPT, Cursor, and Codex use to plug into outside tools. Connect Stash once, and those tools read what you've captured mid-conversation and write new context back when you want.
Do I have to maintain folders and tags?
No. Stash extracts structure from what you capture. You can still search and browse, but the organizing burden is not the main workflow.
Build a second brain your AI can actually use.
Start with one capture. Stash will handle the structure as your context grows.
Free — no invite needed.