5MP camera
Vision builds use the XIAO ESP32-S3 Sense camera stack.
The camera version can capture notes, equations, and diagrams for visual context.
GhostCalc hides a full AI — your pick of ChatGPT, Claude, Gemini, Grok or DeepSeek — invisibly inside your TI-84. Chat, solve, take notes, even read your screen. No computer. No cables. Nobody can tell.
GhostCalc
One calc · any AI
GhostCalc looks and feels exactly like the calculator you already know — until you ask it something.
Type a question on the TI-84, send it over the built-in Wi-Fi bridge, and read a clean answer back on the LCD. Powered by your choice of ChatGPT, Claude, Gemini, Grok or DeepSeek — set your model in the app, and smart routing keeps quick questions fast while hard ones get the deep model.
The 5MP Vision build adds an onboard camera that captures the calculator screen, your notes, or a diagram — so the AI answers your exact problem, with the full visual context.
The ESP32-S3, firmware, power tap and link-port interface are built into the original TI-84 shell. From the outside it's the same calculator — same weight, same buttons, same look.
Type your question straight on the TI-84 keypad, or snap the screen with the camera on the 5MP Vision build.
The hidden ESP32-S3 sends it over Wi-Fi to your chosen AI — ChatGPT, Claude, Gemini, Grok or DeepSeek — and streams the reply back through the link port.
A clean, readable answer appears on the LCD — or a full program is injected, ready to run.
This is the actual on-device menu customers use after the build is installed. No laptop window, no external display, no extra box — just the calculator screen.
A closer look at the camera module that powers the Vision builds and gives the AI visual context.
The camera version can capture notes, equations, and diagrams for visual context.
Every GhostCalc is hand-assembled and bench-tested before it ships.
Already own the right TI-84 Plus? Send it in and get it back with GhostCalc installed — no second calculator to buy, and $50 off the build.
You keep ownership of your calculator, send it in, and get it back with the GhostCalc install completed.
The product cards are quick, but this is the cleaner breakdown: what is included, what changes with Modify Mine, and what gets tested before anything ships.
Every ready-made and mail-in build gets a practical checkout pass, focused on what customers actually use.
Keys, menus, battery behavior, and normal TI-84 functions are checked first.
The ESP32-S3 connects and returns a response through the calculator workflow.
A real prompt is sent and the reply is verified on the device screen.
Program transfer behavior is checked before packaging.
5MP units get a camera capture check for notes and equations.
Orders are packed with the right instructions and matched to tracking.
Buy a ready-made unit, choose Modify Mine at checkout to send your own TI-84 Plus for $50 off, order the 5MP build, or grab the DIY PCB board and build your own. Building it yourself? See the tools you'll need →
Choose 5MP Vision, then select Modify Mine in checkout. That takes $50 off the build. Standard is currently sold out.
Use the Shipping Instructions page and include your checkout email inside the package.
Modify Mine includes return shipping after the install. DIY PCB orders use normal shipping rates.
Send a photo of the calculator model before ordering and the build can be checked first.
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Join thousands of students already using GhostCalc to study smarter — without anyone noticing.
For setup, order status, firmware notes, or custom build questions, this is the fastest way to reach the GhostCalc side of the workshop.
Talk with the builder, get setup help, and follow updates as new firmware rolls out.
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