Yes. The site lists itself as a research project from Imperial College London, and the FAQ says the goal is to make technical diagrams easier to create. Feedback is the only thing the team asks for in return.

What diagram types does RapidChart support?

It supports ten types: General, User Flow, Use Case, Sequence, Class, Entity Relationship, C4, and AWS, Azure, and Google Cloud architecture. You pick the type when you start generating.

Can I use my own API key with RapidChart?

Yes. You can add your own API key on the API Keys page, and the model picker includes options beyond the default GPT-5 mini. This lets you route generation through a provider you already pay for.

Can I share my diagrams?

You can share a workspace with your team and organize diagrams into folders. What you can't do yet is edit the same diagram at the same time, and the team says live co-editing is planned for a later release.

Does RapidChart work inside my code editor?

Yes, through an MCP server. You install it with pip, generate a token, and add the config to your Cursor settings. After a restart you can ask for diagrams in natural language without leaving the editor.

Which diagramming model does RapidChart use?

Generation runs on GPT-5 mini by default, as the site labels it in the prompt bar. If you prefer another model, you can attach your own API key and choose from the available list.

RapidChart.ai

RapidChart Team · Image · Productivity

RapidChart is a free AI UML diagram generator that turns plain text or pasted code into class, sequence, ER, and cloud architecture diagrams.

Visit Tool

About RapidChart.ai

What Is RapidChart

RapidChart is an AI UML diagram tool that builds technical visuals from a short prompt or a block of code. You describe what you want, pick a diagram type, and it draws class diagrams, sequence diagrams, use case, entity relationship, and cloud architecture layouts on an infinite canvas. The generator runs on GPT-5 mini, and the site lists itself as a research project from Imperial College London.

The tool speaks to the crowd that draws architecture and database diagrams by hand. Instead of dragging boxes and aligning arrows, you type something like a microservices architecture or an e-commerce schema, and the AI lays it out. Ten diagram types cover General, User Flow, Use Case, Sequence, Class, Entity Relationship, C4, plus AWS, Azure, and Google Cloud architecture. An MCP server also plugs into Cursor. With it, you generate diagrams without leaving your editor.

The catch is that it's a research build, not a polished commercial product. It's free, the team asks for feedback as the only payment, and the FAQ admits that real-time editing isn't there yet, so a team can share a workspace but can't edit one diagram at the same time. Treat anything it produces as a first pass you clean up.

Getting Started

Sign in with a Google account or an email code at rapidcharts.ai.
Name the diagram, choose a diagram type from the ten options, and describe what you need or paste in code.
Let GPT-5 mini generate the layout on the canvas, then adjust nodes and edges by hand.
Group diagrams into folders and workspaces, or share a workspace so teammates can open your work.
Export the result, or plug the MCP server into Cursor to generate diagrams straight from your code.

Product Information

A quick look at RapidChart.ai's pricing, supported platforms, and performance.

Free PlanYes

Paid PlansFree

PlatformWeb

DeveloperRapidChart Team

CategoryImage · Productivity

Release DateNov 2024

Latest UpdatedOct 2025

Website Visits5.8K

Website Global Rank3M

API AvailabilityYes

Best for

The users, tasks, and scenarios where this tool fits best.

Users

Software engineers
Students learning UML
Solution architects

Tasks

Documenting a codebase
Designing a database
Diagramming from the editor

Scenarios

Explaining a system in a meeting
Starting a design doc
A team that shares work

Key features

Text and code to diagram

The core of the tool is turning description into structure. You type a prompt or paste in code, and the AI builds the diagram, so a system you could only explain out loud becomes a picture on the canvas. It removes most of the manual layout work that makes diagramming slow.

Ten diagram types

Ten options cover the common technical visuals: General, User Flow, Use Case, Sequence, Class, Entity Relationship, and C4, plus AWS, Azure, and Google Cloud architecture. One tool. That range handles both software design and cloud diagrams. Pick the type when you start, and the AI matches the layout to it.

Infinite canvas editing

Generated diagrams land on an infinite canvas you can edit by hand. You can select a node or an edge and change its properties after the AI has done the first pass. Auto-layout handles the initial arrangement, so you're adjusting rather than placing every box yourself.

MCP server for Cursor

RapidChart ships an MCP server you install with pip and wire into Cursor through a config file. You generate a token, add the config to your settings, and then ask for diagrams in natural language from inside the editor. It keeps you in your code instead of switching to a browser tab.

Bring your own API key

You can run generation against your own API key, which you add on the API Keys page. The model list includes options like Claude 3.5 Sonnet alongside the default GPT-5 mini, so you aren't locked to one provider. That's a rare option for a free tool.

Workspaces, folders, and templates

Diagrams live in folders and workspaces, which keeps a growing set of models organized. You can share a workspace with a team, browse community templates, and start from a pre-designed layout. Sharing works today, and simultaneous editing on one diagram is still on the roadmap.

Pros and cons

Pros

Free to use: the site runs as a research project, and the team treats feedback as the only ask.
Wide diagram coverage: ten types span UML, ER, C4, and AWS, Azure, and Google Cloud architecture in one place.
Runs on GPT-5 mini: generation is fast, and you can swap in your own API key for other models.
MCP server: generate diagrams from Cursor with natural language instead of switching to a browser.
Infinite canvas: auto-layout plus manual editing means you adjust the result rather than build it from scratch.

Cons

Research project: it's a student build, so polish and support are lighter than a paid commercial tool expects.
No live co-editing: teammates can share a workspace, but two people can't edit the same diagram at once, which the team says is coming in a later release.
Free means no guarantees: there is no pricing tier and no service commitment, so availability can change without notice.
Typo in the FAQ: the official answer says "lisy" instead of "list," a small sign of how unfinished the site still is.

Frequently asked questions

RapidChart generates technical diagrams from text or code. Describe a system or paste in a code block, and it draws UML class and sequence diagrams, entity relationship diagrams, or cloud architecture layouts on a canvas.

Google EmbeddingGemma 2

Google DeepMind · Writing · Image · Coding

Google EmbeddingGemma 2 is a 740M-parameter open model that turns text, code, images, audio, and video frames into vectors in one 768-dimension space, running on phones and laptops.

Free / Free to download under Apache 2.0, no paid tiersView details

Tractionwave

TractionWave · Image · Marketing

TractionWave is an AI attention heatmap tool for static ads. Upload a PNG or JPG and it returns predicted attention, ranked hotspots, and fixes before you spend budget.

Free / $18 - $185 one-time credit packsView details

Imejis.io

Imejis.io · Image · Marketing

Imejis.io is an AI design studio for agents and marketing teams. Describe an image in plain words, and it writes the copy, builds the layout, reflows it to every size, then exports a finished file.

Free / $0 - $69.99/moView details