Stop Tagging.
Start Thinking.
Your personal knowledge management, synapse.
Your notes, connected by meaning — powered by on-device AI that never leaves your device.
One-time purchase · No subscription · No account required
Your personal knowledge graph — built automatically as you write
Everything your
second brain should be.
Write a note. Watch it find its place. Synapse clusters related ideas automatically — no internet required.
No account, no cloud sync, no telemetry. The AI model runs entirely on your device.
Pick a question. Synapse instantly reranks your graph by relevance. Powered by native Rust.
Write in any language. Synapse maps meaning across 100+ languages simultaneously.
Strong, Weak, or Block. Define how your ideas bond. Not sure yet? Defer it for later.
Your data is yours. Open .linked format — portable JSON, no vendor lock-in.
Hierarchical Mode — ranked by relevance
Semantic recommendations — you decide the connection
Simple by design.
One-time purchase. Download the installer for Mac or Windows and run it. No account needed.
On first launch, Synapse downloads the local AI model. This is the only time internet is needed.
Start writing notes. Synapse builds your knowledge graph in real time, entirely on your device.
Own it once.
Think better forever.
Pay once. Use forever. No subscription.
- ✓ Mac (macOS 13 Ventura or later)
- ✓ Windows (x64)
- ✓ 100% on-device AI
- ✓ 100+ language support
- ✓ All future updates included
- ✓ No account required
Payments securely processed by Lemon Squeezy.
Questions? Answered.
Only for the initial AI model download (one time). After that, everything runs fully offline.
Completely. Synapse collects zero data. No analytics, no telemetry. Your notes stay on your device.
Yes. Synapse uses an open .linked file format — portable JSON with your notes and graph. No lock-in.
Mac: macOS 13 (Ventura) or later, Apple Silicon recommended. Windows: Windows 10/11 x64.
Email us at tomyorangee@gmail.com — we’re happy to help.
Your ideas deserve better
than a folder of tags.
Synapse thinks with you — privately, instantly, for life.
One-time purchase · Mac & Windows · No subscription.
You may see a Windows SmartScreen warning during installation. This happens only once — click ‘More info’ → ‘Run anyway’ to proceed. The app will launch normally from that point on.