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Your knowledge, working for you

A second brain
that thinks back

Capture anything from any device. Synapstash summarizes it, connects it to everything you already know, and brings it back when it matters — down to a morning brief on where your thinking is heading.

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Intelligence brief · 7 new saves

Local agents are becoming an attack surface

#llm-security

Two of this week's saves describe the same injection path your May notes predicted — worth turning into a defense checklist.

#local-models

Your open-model saves are converging on installable, offline agents…

Where this is heading

Workflow agents wrapped in explicit security boundaries.

01

Capture

Anything, from any device, in one action.

02

Understand

Summaries, tags, entities and embeddings — automatic, minutes after saving.

03

Return

The right item resurfaces at the right moment — in search, on your dashboard, in your inbox.

Capture → Understand → Return

Saving was never the hard part. Getting it back is.

Capture from anywhere

Browser extension with one-key save, iPhone share sheet, voice notes with AI cleanup, or just paste a link. If Cloudflare blocks the fetch, the save still lands.

Ask your corpus

Hybrid semantic + keyword search that understands questions. Ask “do I have anything on streaming?” and get ranked, cited answers from your own saves.

An Entity Codex

People, tools, CVEs and techniques are extracted automatically. Open any entity and read what you believe about it — synthesized from your sources, with citations.

Research that ships

Organize saves into Research Projects, draft CFPs and outlines from them, then run every claim against your own sources — supported, unsupported, or contradicted.

A daily intelligence brief

Every morning, an analysis of your recent saves grouped by topic: insights, bridges to older knowledge, research directions, and where your thinking is heading.

Private by design

Your corpus lives in your own database. No tracking, no telemetry, no training on your data. The system reads your knowledge so it can hand it back — to you only.

Stop losing what you learn

Everything you save becomes something your future self can find, question, and build on.

Start your second brain