Widget 1 — Monte Carlo Retirement Calculator
A 720-pixel-wide responsive widget that runs a 100-path Monte Carlo retirement simulation in your reader's browser. Inputs: age, balance, contributions, spend, allocation, forecast source. Output: success rate plus terminal-balance percentiles. Six forward-looking forecasts (J.P. Morgan, BlackRock, Vanguard, GMO, Schwab, Invesco). Footer link to the full app is UTM-tagged so we can both see what's working.
Live preview — exactly what your readers will see.
Copy-paste code:
<iframe src="https://quantcalc.app/embed/monte-carlo.html"
width="100%" height="540"
style="border:0;max-width:720px;display:block;margin:1.5em auto;"
title="Monte Carlo retirement calculator"
loading="lazy"></iframe>
Widget 2 — ACA Subsidy Cliff Calculator (2026 OBBBA rules)
Pure-JS widget — runs entirely client-side, no backend calls, can't go down. Inputs: household size, older spouse's age, projected MAGI, regional benchmark band. Output: % of FPL, dollar distance to the 400% FPL cliff, estimated annual premium tax credit, plain-English verdict (safe / approaching / over). Built around the 2026 HHS poverty guidelines and the OBBBA-restored premium-tax-credit cliff. Especially useful for FIRE, early retirement, and Roth conversion posts where the ACA cliff is the binding constraint.
Live preview — exactly what your readers will see.
Copy-paste code:
<iframe src="https://quantcalc.app/embed/aca-cliff.html"
width="100%" height="600"
style="border:0;max-width:720px;display:block;margin:1.5em auto;"
title="ACA subsidy cliff calculator"
loading="lazy"></iframe>
Why embed this on your blog
| What | Detail |
|---|---|
| Free | No payment, no API key, no ads inside the widget. |
| No tracking inside the widget | The widget loads no analytics scripts, no cookies, no ad pixels. Your visitors see a calculator, not a tracker. (We log the simulation request server-side for capacity planning — same as we'd log any API call.) |
| 100 simulations per run | Returns in 1–3 seconds. Same engine that runs the 10,000-sim version on quantcalc.app. |
| Six forecast sources | J.P. Morgan, BlackRock, Vanguard, GMO, Charles Schwab, Invesco — your reader picks. Sourced from publicly available publications and financial press. |
| Iframe-only | No script-tag injection. Sandboxed, doesn't conflict with your CSS, won't break your theme. |
| Mobile responsive | Single-column layout under 480px. Tested on iOS Safari and Chrome Android. |
| Works on Substack, Ghost, WordPress, Webflow, raw HTML | Anywhere that allows raw iframe embeds. Notes below for each platform. |
Platform notes
- WordPress: paste the iframe into a Custom HTML block. If your theme strips iframes, the "iframe" plugin by webvitaly enables them.
- Substack: paste the iframe into the standard "Embed" block (the one with the </> icon). Substack accepts standard iframe HTML.
- Ghost: paste into an HTML card. No plugin required.
- Webflow: drag in an Embed element and paste the code.
- Plain HTML: anywhere. The iframe carries its own width/height/style.
- Medium: doesn't support raw iframes. Workaround: link out to the standalone widget URL; Medium will render a card.
For finance bloggers and newsletter writers
If you write about retirement planning, FIRE, ACA / IRMAA / Roth conversions, or general personal finance, this is a free hands-on tool you can offer your readers without building or maintaining anything.
The widget links back to QuantCalc's full app (10,000 sims, optimizer, PDF export, life-events) for readers who want more. No advertising shown to your readers; we make money on optional PRO upgrades, and we're transparent about that.
If you embed it, drop us a line at [email protected]. We'll add your blog to a "see-it-in-the-wild" list (with permission), and we'll let you know if we ship a feature you might want to feature.
Attribution and licensing
- The widget itself is free for any non-fraudulent use, on any site, including for-profit and ad-supported.
- The "Powered by QuantCalc" footer link is required — it's how the widget pays for itself.
- If your site has a content policy that conflicts with finance educational tools (gambling sites, MLM-promoting sites, etc.), please don't embed.
- Capital Market Expectations data inside the widget is sourced from publicly available publications by the named asset managers; QuantCalc is not affiliated with, endorsed by, or sponsored by any of them. All trademarks belong to their respective owners.
FAQ
Will this slow down my blog? No. The iframe loads lazily (it's not fetched until the reader scrolls near it) and the simulation only runs when the reader clicks the button. There's no background load.
Do my readers' inputs get sent to you? Yes — when a reader clicks "Run", their numeric inputs are sent to the QuantCalc backend so the simulation can run. No name, email, or any other identifier is collected. Inputs are not associated with any tracking ID we retain. Same as our main app's privacy policy.
Can I customize the look? Not yet. v0.1 ships with a single, clean design. If 5+ blogs embed and ask for theming, we'll add a query-string param for color and density.
What if QuantCalc disappears? The iframe will return a "service unavailable" message — your blog post itself stays intact. We have no plans to shut it down; QuantCalc is in active development.
Variants and roadmap
Currently shipping: Monte Carlo retirement + ACA cliff (both above). If demand warrants we'll add:
- A Roth-conversion-ladder variant
- An IRMAA bracket calculator embed
- A state-tax-burden-by-state embed
- A "compare 6 forecasts at once" mode
If a specific variant would be valuable for your audience, tell us.