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Embed any of 251 AltFTool calculators and converters with a single copy-paste snippet. Free forever, responsive, light & dark themes, and no signup — just keep the small "Widget by AltFTool" credit link.
Search 190+ calculators and converters below.
One iframe tag — no account, no API key, no build step.
Works in WordPress, Ghost, Webflow, plain HTML — anywhere an iframe works.
<iframe src="https://www.altftool.com/embed/widget/a-b-test-significance-calculator"
title="A/B Test Significance Calculator — free AltFTool widget"
width="100%" height="640" style="border:0;border-radius:12px;overflow:hidden"
loading="lazy" referrerpolicy="no-referrer-when-downgrade"></iframe>
<p style="font-size:12px;margin:4px 0 0">Widget by <a href="https://www.altftool.com/tools/all/a-b-test-significance-calculator?utm_source=embed&utm_medium=widget">AltFTool — free online tools</a></p>Widgets are free for personal and commercial sites. The attribution link inside the widget (and the credit line in the snippet) must stay visible — that’s the whole deal. Widgets run in your visitor’s browser; we never see the data they enter.
Tip:widgets follow the visitor’s system theme by default. To pin one, append ?theme=dark or ?theme=light to the iframe URL.