Are these widgets free?

Yes. No sign-up, no charge. Licensed under CC-BY 4.0 — the attribution link to snowballr.io must remain visible.

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?

Yes. The snippet includes a visible attribution link below the calculator. Please keep it as-is — this is the CC-BY 4.0 condition.

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. License: CC-BY 4.0 (keep the attribution link).

Widget builder reviewed October 4, 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">
  <a href="https://snowballr.io/compound-interest-calculator?utm_source=embed&amp;utm_medium=attribution&amp;utm_campaign=compound-widget" target="_blank" rel="nofollow noopener">
    Compound interest calculator by Snowballr
  </a>
</p>

By embedding, you agree to keep the attribution link visible. License: CC-BY 4.0.

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.