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Calixo

Calixo Calculators — Chrome Extension

All 300+ calculators one click away — a popup for a quick calculation, or a side panel that stays open while you browse. Every calculation runs locally in the extension; nothing is sent to a server.

Download the extension

Install it

Not on the Chrome Web Store yet, so installing takes an extra minute via Chrome's own Developer mode — completely normal and safe for a small, source-available extension like this one:

  1. Download the zip and unzip it — right-click it and choose Extract All (Windows) or double-click it (Mac).
  2. Open chrome://extensions in Chrome (or any Chromium browser — Edge, Brave, Opera all work the same way).
  3. Turn on Developer mode (top-right toggle).
  4. Click Load unpacked and select the extracted folder — the one that has manifest.json directly inside it (not a parent folder one level up). If Chrome says "Manifest file is missing or unreadable," you're one folder too high — open into the folder until you can see manifest.json and popup.html listed, then select that folder.
  5. Pin the Calixo icon to your toolbar for one-click access.

Popup vs. side panel

Click the toolbar icon for the popup — search, pick a calculator, get an answer, done. Inside any calculator, Open in side panel → moves it into Chrome's side panel instead, which stays open next to whatever tab you're on — handy for keeping a calculator visible while you fill out a form or compare numbers on another site.

What data does it use?

None of your input ever leaves your browser. The extension bundles the same calculation engine that runs calixo.cloud, so every result computes locally and instantly, with no network request and no account.

FAQ

Is this safe to install outside the Chrome Web Store?

Yes — "Load unpacked" is a standard Chrome developer feature for exactly this kind of small, transparent extension. You can open any of its files in a text editor before installing if you want to check.

Will it stay up to date?

Re-download and reload the folder whenever a new calculator is added. A Chrome Web Store listing (with automatic updates) is planned.

Does it work in Edge or Brave?

Yes — any Chromium-based browser supports the same "Load unpacked" flow.