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diagramkit

Diagrams without
the AI slop.

diagramkit makes illustrations for your textbooks, courses, videos and newsletters.

Make a diagram See examples
diagramkit
The diagramkit editor: a supply and demand request in the conversation on the left, and the finished chart on the canvas on the right, with demand shifting right and the price rising.

Real prompts. Real diagrams.

The stages of mitosis in order, with what happens to the chromosomes at each stage

The six stages of cell division in order, from interphase to cytokinesis, each with a drawing of the cell and what its chromosomes do.

Make changes without starting over.

Every label is text. Click it and type. No waiting for an AI to redraw the whole image.

Butterfly life cycle · Editing
The diagramkit editor: the stage label Chrysalis (pupa) on a butterfly life cycle is clicked and retyped as Chrysalis (pupa stage).

Your brand, not a preset.

Add your logo, fonts and colours once. Preview them, then every diagram uses them.

Or ask Claude or ChatGPT to set it up for you.

More than just a coat of paint

Change icons, fonts, colors, and more

The same diagram in the No brand brand, with its fonts, colours, icons and node shapes.

For people who care about craft.

Textbooks

Chapter 3 · Plants

How plants make food

Sunlight, carbon dioxide and water go into a leaf; oxygen and glucose come out.
Figure 3.2 Photosynthesis in a leaf

Courses

Earth science

Lesson 4: Plate boundaries

Divergent, convergent and transform plate boundaries, with the rifts, mountains, volcanoes and earthquakes each one creates.Next lesson

YouTube videos

Four satellites send timed signals; the phone measures each travel time and the four ranges cross at its position.
4:12 / 11:30

How GPS finds your location

Newsletters

Prices explained

Why prices kept rising after 2022

US CPI inflation from 2019 to 2025 peaks at 9.1 percent in June 2022, with the Fed’s 2 percent target shown as a dashed line.

Works where you already work.

diagramkit

How a neuron sends a signal, from the dendrites to the next neuron

A neuron: dendrites receive a signal, the cell body adds it up, the axon carries it and the terminals pass it to the next neuron.

On the web

Type what you need, then click any word to change it.

Draw what happens when I click Sign in with Google

Sign in with Google: the app sends you to Google, you approve, Google returns a code, the app exchanges it for a token and signs you in.

In Claude and ChatGPT

Add diagramkit as a connector, then ask for a diagram in the chat.

Request
curl https://diagramkit.ai/api/v1/diagrams \
  -H "Authorization: Bearer aid_..." \
  -d '{"prompt": "The water cycle for a 6th-grade science book"}'
Response
{ "id": "d_8f2c", "status": "queued" }
A minute later, the image
GET /api/v1/diagrams/d_8f2c/image.png

Through the API

Send a prompt, get back a PNG or PDF.

Why not just ask ChatGPT?

We gave ChatGPT Images and diagramkit the same prompt. Here's what each one drew.

How MCP (the Model Context Protocol) works: an AI app like Claude connects to MCP servers, each server lists its tools, the model picks a tool, the app calls it, and the result goes back to the model.

ChatGPT Images
An illustrated MCP overview with server racks, an AI app, a model choosing from tool lists and a result loop.
  1. Typo: “e.g,” for “e.g.”
  2. “Connects to MCP Servers” points at the model, not the servers.
  3. The servers feed straight into the model. The app sits between them.
  4. This arrow points at nothing.
diagramkit
A sequence between the model, an AI app and MCP servers: the app connects and lists tools, the model picks one, the app calls the server and passes the result back.

ChatGPT Images model: chatgpt-image-latest, October 2026.

Make your first diagram.

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