Embed Our Free, Privacy-First Ovulation Calculator on Your Site
Empower your readers with clinical-grade fertility and ovulation calculations directly on your blog or website—with zero patient tracking, 100% client-side privacy, and instant 1-click installation.
Customize Your Fertility Calculator Widget
Select a theme to see the live preview and generate your drop-in embed code snippet.
<!-- Free Ovulation Calculator Widget by FreeOvulationTracker.com -->
<div id="free-ovulation-widget" data-theme="rose"></div>
<script src="https://freeovulationtracker.com/widget.js" async></script>✓Pure Vanilla JavaScript: No jQuery, React, or external stylesheet dependencies required.
✓Responsive Design: Fits perfectly inside blog sidebars, full-width articles, or modal popups.
✓Asynchronous Loading: The async attribute guarantees zero render blocking.
Why Choose Our Privacy-First Embeddable Widget?
Built from the ground up to protect intimate reproductive health and deliver seamless user experiences.
100% Client-Side Privacy
All date inputs and cycle calculations execute locally in the visitor's browser. Zero personal dates or intimate health data ever reach an external server.
GDPR & HIPAA Compliant by Architecture
Protect your website from reproductive privacy liabilities. Because no Protected Health Information (PHI) is transmitted or stored, your compliance is built-in.
Zero Patient Tracking & No Ads
No third-party ad networks, no cross-site cookies, no surveillance pixels, and no paywalls. A clean, ethical medical resource for your audience.
Clinical Wilcox 6-Day Model
Powered by peer-reviewed reproductive physiology from The New England Journal of Medicine (NEJM), estimating the authentic 6-day fertile window.
Ultra-Lightweight (<15KB)
A standalone vanilla JavaScript bundle with zero dependencies. Asynchronous loading ensures zero negative impact on your Core Web Vitals.
Responsive Multi-Theme Design
Choose between Rose Signature, Clean Light, and Sleek Dark themes that fluidly adapt to desktop articles, sidebars, and mobile screens.
How to Embed the Calculator in 3 Easy Steps
1. Select Your Desired Theme
Pick Rose Signature, Clean Light, or Sleek Dark in the interactive customizer above to match your website's color palette.
2. Copy the Embed Code Snippet
Click the 1-click copy button above to grab the lightweight HTML div container and asynchronous script tag.
3. Paste into Your Web Page or CMS
Paste the snippet into any custom HTML block, post template, or sidebar widget in WordPress, Webflow, Squarespace, Ghost, Shopify, or Wix.
Looking for Raw Reproductive Calculations? Use Our Open-Source Library
Building your own mobile app, custom fertility portal, or digital health tool? Integrate our official npm package @freeovulationtracker/cycle-math for zero-dependency Wilcox fertile window and hCG doubling math.
npm i @freeovulationtracker/cycle-mathReview Our Clinical Evidence & Methodology →Frequently Asked Questions About the Widget
Is this widget really 100% free to embed?
Yes. Our widget is completely free forever for bloggers, fertility coaches, health publishers, medical clinics, and webmasters. There are no subscription fees, hidden tiers, or usage caps.
How does the widget protect my visitors' reproductive privacy?
Unlike commercial tracker widgets that capture patient IP addresses, emails, and dates for advertising profiling, our script executes 100% locally inside the visitor's browser JavaScript runtime. No inputs are ever sent to our servers or any third parties.
Will this widget slow down my website?
Not at all. The standalone bundle is smaller than 15KB uncompressed and loads asynchronously using the async script attribute. It has zero external library dependencies and will not delay your page rendering or degrade Core Web Vitals.
Can I adjust the width of the widget?
Yes. The widget is fully responsive and automatically expands to 100% of its containing parent element (with a maximum built-in ceiling of 440px for ideal readability). You can place it inside a sidebar, a narrow column, or a full-width blog section.