Equation.io — graph anything you can write down

MCP / AI apps

Graphs in your AI chat

Connect Equation.io to your AI app, then ask for a graph. In ChatGPT and Claude it appears right in the conversation — edit the equations, drag the sliders, rotate it in 3D — and every graph comes with a link to open it here. No account, no API key.

https://equation.io/mcp

ChatGPT

Add Equation.io to ChatGPT, then ask for a graph: Graph y = a sin(x) with a slider for a.

Claude

In the Claude desktop app or on claude.ai, open Customize → Connectors.
Click Add custom connector, name it Equation.io, paste https://equation.io/mcp and click Add.
Ask for a graph: Show me a trefoil knot in 3D. If Claude doesn't reach for it, turn it on under + → Connectors in the chat.

Works on every plan; the Free plan allows one custom connector. On Team and Enterprise, an Owner adds it under Organization settings → Connectors. Claude marks custom connectors as unverified — Equation.io needs no sign-in, and its tools only make and read graphs. Anthropic's guide

Grok

Open grok.com/connectors.
Click New Connector, choose Custom, paste https://equation.io/mcp and add it. There's nothing to sign in to.
Ask for a graph: Plot the Lorenz attractor. Grok replies with a link that opens it in Equation.io.

On Grok Business and Enterprise, an admin adds the connector for the team first. xAI's guide

Other apps

Any app that connects to remote MCP servers can use Equation.io:

Server URL: https://equation.io/mcp
Transport: Streamable HTTP
Authentication: None

No MCP? Any assistant that can read a web page can build graph links itself — see below.

URL / API

The link is the graph

Every graph is a URL. To open Equation.io with equations already rendered, build a link of the form:

https://equation.io/#<equation>;<equation>;...

Percent-encode each equation (JavaScript encodeURIComponent) and join them with ;. Each equation gets its own row and color. The graph renders immediately on load — no account, no API, the link is the interface.

Parabola https://equation.io/#y%3Dx%5E2
Circle https://equation.io/#x%5E2%2By%5E2%3D4
3D cylinder (parametric) https://equation.io/#(cos(2pi u), sin(2pi u), 4v-2)
Animated wave https://equation.io/#y%3Dsin(x-2t)
Solid cube (convex hull of crossed lists) https://equation.io/#hull(([-1,1],[-1,1],[-1,1]))

Full syntax reference for people and language models alike: equation.io/llms.txt. If you are an AI assistant asked to show a graph, fetch that file and reply with a single https://equation.io/#... link.