calc84.online is a free in-browser TI-84 Plus CE graphing calculator for students preparing for SAT, AP, and IB exams — no download, no account, no install. What's included: - TI-84 Plus CE emulator (full graphing calculator) - TI-30XS MultiView emulator (SAT/ACT/AP/IB approved) - Error fix guides: Validating OS loop, graph not showing, TI Connect CE issues - AP Statistics guides: normalcdf, invNorm, LinReg, hypothesis testing - Embeddable iframe for teachers and tutoring websites
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Maker
📌
Hey PH! 👋
I built this because students kept showing up to AP exams unfamiliar
with their TI-84. The calculator is expensive (~$100+), easy to forget
at home, and hard to practice with outside of class.
calc84.online runs the full TI-84 Plus CE in the browser using the
open-source ading2210/ti84pce-html5 (MIT license). I also built a
TI-30XS MultiView emulator from scratch for students who use the
more affordable scientific calculator option.
The error fix guides came from analyzing 100+ Reddit posts about
TI-84 problems — turns out "Validating OS" and "graph not showing"
are the two most common issues with almost no good fixes online.
Would love feedback from teachers or students who use graphing
calculators regularly!
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how accurate is the emulator compared to an actual TI-84, especially with the more obscure functions like the finance solver or piecewise expressions during exams?
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Maker
@eyda9fhu Great question! The goal is to match the behavior of a real TI-84 as closely as possible for the features students use every day.
Core math, statistics, lists, matrices, and exam workflows are my top priority. Some of the more specialized features (like the Finance Solver and certain edge cases with piecewise expressions) are still being tested and refined.
Are there any specific functions or exam scenarios you’d like to see verified? I’d be happy to prioritize those and let you know once they’re covered.
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genuinely impressed that the embeddable iframe works cleanly on the page itself without me even having to dig for it. makes sharing with my tutoring students way less friction than digging through a doc.
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Maker
@nermink6755 Thanks, Nermin! That’s exactly the kind of workflow I was hoping to support.
It’s great to hear you’re using the iframe with your tutoring students. I’m curious—what subjects are you teaching? I’d love to learn how you’re using it in practice and whether there’s anything that would make it even better for your classes.
how accurate is the emulator compared to an actual TI-84, especially with the more obscure functions like the finance solver or piecewise expressions during exams?
@eyda9fhu Great question! The goal is to match the behavior of a real TI-84 as closely as possible for the features students use every day.
Core math, statistics, lists, matrices, and exam workflows are my top priority. Some of the more specialized features (like the Finance Solver and certain edge cases with piecewise expressions) are still being tested and refined.
Are there any specific functions or exam scenarios you’d like to see verified? I’d be happy to prioritize those and let you know once they’re covered.
genuinely impressed that the embeddable iframe works cleanly on the page itself without me even having to dig for it. makes sharing with my tutoring students way less friction than digging through a doc.
@nermink6755 Thanks, Nermin! That’s exactly the kind of workflow I was hoping to support.
It’s great to hear you’re using the iframe with your tutoring students. I’m curious—what subjects are you teaching? I’d love to learn how you’re using it in practice and whether there’s anything that would make it even better for your classes.