Put our checkers on your site.
One script tag adds a self-sizing deliverability toolkit to any page: agency sites, help centres, ESP onboarding docs. Pick the tools and theme, copy the snippet, done.
Your snippet
HTMLWordPress: paste into a Custom HTML block. React: render it with a small effect that appends the script.
Copy, paste, publish
Choose
Tick the checkers you want and a theme. Auto follows each visitor’s light or dark preference.
Paste
Drop the snippet where the widget should appear. It works in any CMS that accepts HTML.
Publish
The iframe loads lazily, sizes itself, and keeps working as we add checks.
Widget questions
Is the widget really free?
Yes. No API key, no account and no usage fee. We only ask that you keep the small "Powered by SenderDirect" line visible.
Will it slow down my page?
The loader is a tiny async script that inserts one lazy-loaded iframe. It never blocks rendering, and the iframe resizes itself to fit its content.
Does it set cookies or track visitors?
No. The widget sets no cookies and runs lookups in the visitor’s browser through public DNS-over-HTTPS, exactly like the tools on this site.
Can I embed it in WordPress?
Yes. Add a Custom HTML block and paste the snippet. Page builders such as Elementor and Webflow have an equivalent HTML or embed element.
Can I pre-fill a domain?
Add data-domain="example.com" to the script tag and the widget runs that check on load, which is handy for agency client reports.