✦ New — Synapse 4.0: memory that runs on-device

One place for
everything you know.

Synapse is a second brain that captures your notes, links them automatically, and resurfaces the right idea at the right moment — before you even search.

Start free → Watch the 2-min demo

Free 30-day Pro trial · 4.9★ average across 12,000 reviews

The canvas

Notes that connect themselves

Write in a fast editor. Synapse quietly builds a living graph of every idea you've ever noted.

Recall

Ask your past self anything

Natural-language search with citations — across notes, PDFs, and clipped articles.

41ms
Capture

Everything has an inbox now

Global quick-capture, email-to-note, web clipper, voice memos. It all lands, tagged and titled.

Resurface

Ideas, replayed

Smart echoes bring old notes back exactly when they're relevant.

Sync

Every device, zero conflicts

End-to-end encrypted CRDT sync. Works on a plane, works offline, works forever.

Open

Your data, on your terms

Local-first files, one-click export, API for your own automations.

"Synapse gave me back the one resource I couldn't buy more of — my own remembered knowledge. Two weeks in, I know more about my own work than Google ever did." Elena Vasquez, staff engineer & 10-year note hoarder

Simple, honest pricing

Start free. Upgrade when your brain gets big.

Solo

$0/forever
  • Unlimited notes
  • 2 devices
  • Semantic search
  • Local-first vault
Start free

Pro

$8/month
  • Everything in Solo
  • Unlimited devices & sync
  • Resurfacing & echoes
  • AI recall with citations
  • Priority support
Try Pro free

Teams

$14/user/mo
  • Shared knowledge base
  • Permissions & SSO
  • Team graph search
Talk to us

Feed your second brain.

Download Synapse and watch your ideas start finding each other.

Download free →See it in action