Free embeddable tools for your own site. No signup, no tracking added on your end, no cost. Copy-paste code that works on WordPress, Squarespace, Wix, or a plain HTML page.
Each widget is a single iframe plus a one-line credit. You paste both into your post or template and nothing else changes on your site.
The widgets load lazily, so the browser only fetches one when it scrolls into view. Nothing loads at all if a reader never reaches it. They carry no analytics, no advertising and no third-party scripts, so nothing is added to your own page weight beyond the frame itself.
Nothing is tracked and no cookies are set by the widget. Calculations run in the visitor's own browser and no values are sent anywhere. If your site carries a privacy notice, embedding one of these does not require you to change it.
The paste-in code includes a small visible line reading "by UnitMojo" with a link. That is the only thing asked in return, and it is how a free tool funded by nobody gets found. You can see it before you paste it, and you can remove it if you would rather. The widget still works either way.
The widgets are plain HTML and JavaScript on stable URLs, and they are covered by the same automated tests as the rest of the site. If one is ever retired the URL will keep working rather than going blank. Tested on WordPress, Squarespace, Wix and hand-written HTML.