Circuit Notebook Beta Open the app

Open beta · free until 1 December Schematics · block diagrams · waveforms

The engineering notebook for circuits.

Draw schematics, block diagrams and waveforms on sheets that open like blocks, with IEC or ANSI symbols, LaTeX everywhere, tables and task boards. Then present it with animations, export it to your report, or work on it with your team — right in your browser.

Start drawing — it's free Open the example project

No account needed · works offline · free until 1.0 (1 December 2026) · see it in 3 clicks ↓

The example project in the Circuit Notebook editor: a plant watering station with its title slide and illustration, the block diagram with a 5 V supply and three hierarchical blocks, a calibration table and the waveforms of a day in the pot.
click it: it opens, ready to edit
a whole sheet inside each block

How it works

A schematic in 3 clicks

  1. Place a part. Pick it in the library, click on the sheet.
  2. Drag a wire from one pin to another: it finds its way.
  3. Present. The current flows, the LED lights up.
Try it now — no account Open the example

Open beta · until 1 December 2026

Made by one student, free while it grows

Hi! I'm an engineering student, and I build Circuit Notebook on my own, in my free time. It is an open beta until Circuit Notebook 1.0 comes out, on 1 December 2026. Until then everything is free, and a few things may still change or break. Tell me when they do — your feedback decides what comes next.

  • Drawing in your browser: free, no account, as many projects as you like
  • With an account: 5 projects on the server to share, up to 5 MB each
  • Your work stays yours: download it any time (project file, PDF, SVG, PNG)
  1. Schematics
  2. Hierarchy
  3. Waveforms
  4. Tables
  5. Together
  6. Present
  7. And more

Schematics

Symbols done right

160 parts in IEC 60617 or IEEE 315 style — the whole drawing switches in one click. Drag from a pin to another: the wire finds its way around the parts, and junction dots place themselves.

  • MOSFETs, diodes, motors, bridges — and Arduino and ESP32 boards
  • LaTeX in every label, like Vout = D·Vin
  • A shorted part is ringed in red, before you build it
The pump driver of the example: a logic-level MOSFET, its gate resistors, the pump and its flyback diode, with the options of the selected MOSFET in the right panel.

Hierarchy

Sheets inside blocks

A block is a whole sheet: double-click it to go inside, draw its circuit, add ports — they become the pins of the block. In the PDF, every block is a link to its page.

  • The Sheets tab shows the whole tree
  • Boards keep their pin names, as printed on them
  • Plain blocks for a quick system sketch
Inside the controller block of the example: an Arduino Nano with its pins named as on the board, the ports A0, D9, 5V and GND, an LED, a note with the firmware, and the tree of sheets on the left.

Waveforms & sketches

The waveforms, next to the circuit

Chronograms, oscillograms, Bode plots and pole-zero maps from presets — or your own curve, point by point. Annotate them with the pencil, pin a sticky note, draw a flowchart.

  • Bode and pole-zero plots, computed, not drawn
  • Pencil with pen pressure, shapes, arrows, images
  • Flowcharts with ISO 5807 shapes and attached connectors
A day in the pot, from the example: the probe voltage drying out until it reaches the threshold, the pump pulse, a red pencil ring, and a zoom on the three seconds of watering with the start-up peak of the pump current.

Tables & tasks

Measurements and to-dos, on the sheet

Tables for your measurements and task boards for the work left, next to the circuit. Paste cells from Excel or ChatGPT; give a card to a teammate, tick it done.

  • Each cell with its own paper, bold, colour and LaTeX
  • Copy a table for Excel, or as a LaTeX tabular
  • Drag cards from To do to Done
The next steps of the example: a task board with To do, Doing and Done, a sketch of version 2 in plain blocks, and a note with the keys of the presentation. The calibration table of the example: soil, probe resistance, voltage, ADC reading and pump, with the threshold drawn in red pencil.

Collaboration

Work on it together, live

Share with a friend, a team or a link: see each other's cursors, comment right on the drawing, go back to any version. And decide sheet by sheet who can edit, comment, view — or not even see it.

  • Keeps working offline, syncs when you are back
  • Hide the solution sheet until the lab is over
  • Lock a sheet so only you can change it
Two people on the same project: a comment thread about the inductor, and a teammate's cursor on the capacitor.

Present & export

Present it, then put it in your report

Frames become slides, and the drawing acts: a switch closes, a current flows, a curve moves. Point with the laser, write with the pen and keep your notes. Then export a clickable PDF, SVG, PNG — or CircuiTikZ code that compiles straight into your thesis.

  • One PDF page per sheet, with bookmarks and links
  • A blackboard beside the slide, for the question at the end
  • Classmates follow your slides on their own screen, with a view link, no account needed
Presenting the example: S1 is closed, the 5 V bus is red and the pump current flows from the supply to the pump driver and back. The buck converter compiled with pdflatex from the CircuiTikZ export.

And more

The small things that save your evening

  • Images — crop, round, cut out
  • Covers — a picture per project
  • Shadows — soft, in every export
  • Symbol editor — with named pins
  • Templates — reuse a circuit
  • Version history — go back any time
  • Offline — keeps working, syncs later
  • Keyboard first — press ? to see every shortcut
The example on a phone: the pump driver fills the screen, with a bar of actions for the selected diode.

Learn and compute

Practise on real circuits, then size your own

The Playbook A game to learn electronics Opens on 1 December Fourteen chapters of real circuits, solved live as you answer. Eight are free. See the chapters Calculators Thirty-three calculators that draw your circuit Opens on 1 December The part you can buy, the working shown, the circuit dropped in your notebook. See the calculators

Connected AIs

Ask your AI. It draws in your notebook.

Opens on 1 December

Connect Claude, ChatGPT or another AI app to your account. It explains your sheets, draws circuits you can change, and checks its own work. A free account gets 40 drawing steps a day.

See how it works

You “Draw the LED circuit of my lab.”

The LED circuit, drawn by an AI with Circuit Notebook's tools5 V330 Ωred
Drawn by an AI with Circuit Notebook’s own tools.

Questions

The short answers. The long one: open the app and try — no account, nothing to install.

Is it free?

Yes — Circuit Notebook is in open beta and free. Drawing, exporting and presenting need no account, and projects in your browser are unlimited. Each account can also keep 5 projects on the server (up to 5 MB each) to share them. The beta ends on 1 December 2026 with Circuit Notebook 1.0: a Premium plan then gives more room on the server; drawing in your browser stays free.

How can I help?

Circuit Notebook is made by one electronics student. Tell your classmates about it, and send feedback: it decides what comes next. You can also create your account before 1 December 2026: you keep -50 % on Premium for life.

Can I work on it with my team?

Yes: add friends by @username or e-mail, make teams, and share a project with a person, a team or a link. Each one can edit, comment or view — the whole project or sheet by sheet, and a sheet can be hidden from someone. You see each other's cursors, comment on the drawing and keep a history of versions. For a class or a tutor, a view link shows the project read only, without an account, and they follow your slides live.

Can my school or company pay?

Yes. Students draw for free; a teacher or an engineer takes Premium, and Paddle's invoice can carry the name and tax number of their school or company. For a quote, several licences or a data processing agreement, see Circuit Notebook for schools and companies.

Where are my projects saved?

In your browser, on your computer. Nothing is sent anywhere unless you share a project with a collaboration server. You can also download a project file (.olg) to back it up or move it.

Does it work offline?

Yes. Once opened, the editor works without a connection; shared projects sync again when you are back online.

Does it work on a phone?

Yes, for looking and small changes: open a project, zoom with two fingers, move or rotate a part, add one, reply to a comment, present it. Drawing a whole schematic is still more comfortable on a computer, with a mouse.

EU or US symbols?

Both: IEC 60617 (Europe) and IEEE 315 / ANSI (US). Switch the whole project in one click, or override a single part.

Can I put the drawings in my LaTeX report?

Yes: export a vector PDF or SVG, or CircuiTikZ code that compiles with pdflatex. All the labels can be LaTeX.

Does it simulate circuits?

No, and that's on purpose. Circuit Notebook is for drawing, explaining, presenting and working together. Keep your simulator for the numbers, and bring the waveforms back here to tell the story.

Write to me

A bug, an idea, a symbol you miss, a question about your course? I read every message and answer by e-mail.

Or e-mail [email protected]

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