Are these widgets free?

Yes. No sign-up, no charge. The provided snippet includes a visible Snowballr source credit, the widget source URI, and a link to the CC BY 4.0 license; keep these attribution details when reusing the widget.

Will the widget slow down my page?

The iframe is marked loading="lazy", so browsers can defer loading it until the reader approaches it. Actual page speed also depends on the host page and its other resources.

Can I customize the colors or fonts?

Not currently. The widget keeps Snowballr branding. Custom theming is on the roadmap — contact us if you need it.

Do I have to credit Snowballr?

The snippet includes a visible Snowballr source credit, the widget source URI, and a link to the CC BY 4.0 license. Keep these attribution details when reusing the widget.

WIDGET BUILDER

Embed a Snowballr calculator

Free iframe snippet for your blog, newsletter, or course site. Pick a calculator, set the size, copy the code. No sign-up. The snippet includes a visible source credit, the widget URI, and a CC BY 4.0 license link; it does not add a publisher-site backlink.

Widget builder reviewed October 13, 2026; browser loading behavior and host-page performance can vary.

1. Pick a calculator

2. Size

Height (px)

3. Tracking tag (optional)

Used in UTM campaign so we can see traffic from your site. Defaults to compound-widget.

4. Copy & paste

<iframe
  src="https://snowballr.io/embed/compound?utm_source=embed&utm_medium=iframe&utm_campaign=compound-widget"
  width="100%"
  height="720"
  loading="lazy"
  style="border:0;border-radius:8px;max-width:100%"
  title="Compound interest calculator by Snowballr">
</iframe>
<p style="font-size:12px;color:#666;margin-top:4px">
  Compound interest calculator by Snowballr · Source: https://snowballr.io/embed/compound · Licensed under <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank" rel="nofollow noopener">CC BY 4.0</a>
</p>

Keep the visible Snowballr credit, source URI and CC BY 4.0 license notice with the snippet. The provided code does not add a publisher-site backlink to Snowballr.

5. Live preview

Why a widget instead of just linking?

Readers can test a scenario without leaving your article.
Adds an interactive example alongside your explanation; search rankings are never guaranteed by an embed.
Costs you nothing, costs us nothing — calculator runs entirely client-side.
Works in any CMS that allows iframe embedding (WordPress, Ghost, Substack, Webflow).

Want raw numbers instead?

Use the free JSON API for compound interest, loan, and debt-snowball calculations directly. See /api-docs.

Print a one-page reference

Cheat sheets with the formulas, key numbers, and decision rules in single-page PDF format. See /cheat-sheets.