Your graphing calculator,
online.

Plug it into your computer and it becomes an AI assistant, a maths solver, and a chat client.

A TI-84 Plus CE running the GPT app, plugged into a laptop

A photo of the calculator running GPT belongs here.
/media/hero-calculator.jpg, 4:3

GPT

Questions typed on the keypad go to your AI provider. Answers come back on the calculator screen, kept short enough to actually read.

Math

Every key gives what is printed on it, so an equation types the way you would write it. Answers arrive as worked steps.

Chat

Rooms and direct messages between calculators. Type on the keypad and it lands on somebody else's screen.

How it works

The page talks to your calculator over USB and to your AI provider over HTTPS. Nothing of ours sits in between, which is why there is nothing to install and nothing to trust us with.

Load the apps

Send GPT, MATH and CHAT across with TI Connect CE. One time only.

Add a free API key

Groq, OpenRouter and Google all have free tiers. Setup walks you through it, or skip it and use CHAT.

Press connect

Pick the calculator from your browser's device list and start typing.

Two ways to use it

The calculator speaks one simple line protocol and does not care what is on the other end. Today that is your computer. Next it is a board small enough to live in the case with it.

Working now

Tethered

The cable that came in the box, straight into your computer. This page does the thinking, and there is nothing to install.

In development

Bridge

A XIAO ESP32-S3 Sense on the link port with its own WiFi, battery and camera. No computer anywhere.

You reach the bridge over Bluetooth once, from bridge setup, to give it a network and a key. After that it runs on its own. The camera is the interesting part: point it at a question in a book rather than typing an integral on a keypad.

What you need

All of it is free, and you probably have most of it already.

A TI-84 Plus CE: Any CE or CE-T. The apps are compiled C programs, launched through arTIfiCE or Cesium.
Chrome or Edge: Web Serial is not available in Safari or Firefox. Chrome on Android works too.
A free API key: From Groq, OpenRouter or Google AI Studio. It takes a minute and costs nothing.
A USB cable: The one that came with the calculator. Plug it straight into the computer, not through a hub.

Calculator apps

Send these across with TI Connect CE, then launch them through arTIfiCE or Cesium. They are compiled programs, so they will not run from the [prgm] menu on OS 5.5 and later.

GPT.8xpAsk a model anything MATH.8xpEquations with worked steps CHAT.8xpRooms and direct messages

Your graphing calculator,online.

GPT