Notes that think with you.

Synapse is the smart note-taking and drawing app with AI at its core. Write like on paper, let the AI recognize your handwriting, solve math problems — and everything stays in sync across all your devices.

7-day free trial
No credit card needed
Cancel anytime
AI reads handwriting
x² + 2x = 14
Synced
Available on
💻 Windows 🤖 Android
Features

Everything you need, in one place.

Synapse combines free-form drawing, structured notes and AI assistance in a single app. Instead of switching between five tools, you work in one place.

Annotate PDFs

Load lecture scripts, worksheets or contracts as a background and write directly on top. Perfect for slide annotations, lecture notes and corrections.

AI reads your handwriting

Lasso your handwritten text → "Recognize" → done, typed text. Works even with messy handwriting, sketches and notes.

Solve math with a lasso

Write an equation, circle it, hit "Solve". Synapse shows you the step-by-step solution — perfect for school and university.

AI chat inside your notebook

Ask the AI about your notes, get concepts explained, or request a summary. The AI sees your notebook context.

Synced across all your devices

End-to-end cloud sync. Start a notebook on your tablet, continue on your desktop, read on your phone. Servers in Germany.

Function plotter built in

Plot functions, transfer functions, analyze Bode diagrams. Engineering tool and notebook in one.

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Uptime guaranteed
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Storage up to
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Days free trial
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AI reset daily
University & school

Take lecture notes, solve math, ask the AI — all in one.

Let the AI extract formulas from your sketches, instantly plot them as graphs, ask the chat assistant to explain. Synapse replaces four tools: notes app, calculator, plotter and study aid.

  • Lasso a handwritten formula → solve automatically with steps
  • Type a function → plot instantly
  • AI chat understands your notebook context
  • Insert PDFs as backgrounds (scripts, worksheets)
x y f(x) = x² (2, 4)
Productivity

Multiple notebooks at once — like browser tabs.

Working on a project and need something from another notebook? Open it as a second tab and switch with one click. No file searching, no context loss.

  • Tab bar at the top — like Chrome & Firefox
  • Split-screen for two notebooks side by side
  • Copy lasso content between tabs
  • Quick-switch via side menu
📓 Analysis
📕 Physics II
✏️ Sketches
+
∫ f(x) dx = F(x) + C Entered at 14:32
Pricing

Fair, flexible, cancel anytime.

Start with 7 days of free full access. Then pick the plan that fits — from the small Bronze plan to Platinum with full AI power.

Bronze
0,99/month
For minimalist note-taking
  • Unlimited notes locally
  • Cloud sync
  • AI features
  • Function plotter
Choose Bronze
Gold
9,99/month
More storage, more AI
  • 10 GB cloud sync
  • AI Light: 150,000 tokens/day
  • Nearly 2× as many AI requests as Silver
  • Priority support
Choose Gold
Platinum
19,99/month
Full AI power, Pro models
  • 20 GB cloud sync
  • AI Pro: 250,000 tokens/day
  • Gemini Pro for more accurate math & chat
  • 3× more tokens than Silver
Choose Platinum
Annual billing: save −17 %
Compare all plans in detail →
Made for

Built for everyone who wants more than just typing.

Synapse combines free-form drawing, AI assistance and structured notes — whether you write formulas at uni, sketch in a studio or plan concepts.

Students

Lecture notes, math exercises, script annotation. Lasso-solve, AI explanations, function plotter — all in one notebook.

Creatives & designers

Sketches, moodboards, storyboards across any number of notebooks with all pen and drawing tools — synced across all devices.

Engineers & researchers

Formula libraries, Bode diagrams, transfer functions plotted directly in the notebook. PDFs as background, AI chat for complex math problems.

FAQ

Frequently asked questions

Can I try Synapse for free?
Yes. You start with 7 days of full access to all features — no credit card required. After the trial period you pick a plan or your account pauses.
How secure is my data?
All sync data is on servers in the EU. Passwords are hashed (bcrypt), all transfer goes over TLS. You can delete your account including all data at any time.
Which devices does Synapse run on?
At launch, Synapse runs on Windows (desktop & tablet) and Android (phone & tablet). More platforms are coming — one subscription automatically works on all your devices.
How many AI requests fit in the daily limit?
Limits scale with your plan: Silver 80,000, Gold 150,000, Platinum 250,000 tokens/day. Rules of thumb: a handwriting recognition costs ~1,500 tokens, a math problem with solution steps ~3,000 tokens, an AI chat response ~2,000 tokens. The limit resets daily at midnight UTC. The app shows your usage in real time.
Can I cancel anytime?
Yes, any time. Your subscription continues until the end of the paid period and then ends automatically. No hidden fees, no minimum term.
What if I end up not liking Synapse?
That's exactly what the 7-day free trial is for — all features, no credit card. Buying a plan after the trial means you waive your right of withdrawal (instant AI access), but you can cancel anytime so no further charges occur. If something is technically broken, drop us a line at support@synapse-app.at — we handle these case by case.
What is the difference between AI Light and AI Pro?
AI Light uses the fast Gemini 2.5 Flash model — perfect for handwriting recognition and simple calculations. AI Pro additionally uses the stronger Pro model for complex math and detailed chat answers (but uses more tokens per request).

Ready to take smarter notes?

Start your 7-day trial. No credit card. No commitment.