We collect nothing.

Who we are

Organic Pulse is a free educational initiative of Dr. Sandeep G. Sontakke. It is a personal initiative: the views and content are the author's own and do not represent the official views of any institution.

What stays on your device

• Your light or dark mode choice and your lesson progress (the four quadrant ticks) are saved in your own browser, using its local storage.
• They are never sent to us. Clear them at any time by clearing this site's data in your browser.
• If you install the app, lesson pages and notes are kept in your browser's cache so they work offline.

What we do not collect

• No names, email addresses, phone numbers or other personal details.
• No analytics, advertising or tracking scripts.
• Because nothing personal is collected from anyone, nothing is collected from students under 18 either.

Hosting and other sites

• The site is hosted on Cloudflare Pages. Like any web host, Cloudflare may keep standard technical logs needed to deliver and protect the site.
• Fonts, videos, pictures and notes are served from this website itself.
• Links to other sites (YouTube, LibreTexts, OpenStax, publishers, DOI links) open those sites, which have their own privacy policies.

Terms of use

• Everything here is free for your personal study.
• Teachers are welcome to share links to these lessons and notes with their students.
• Please do not republish or copy the lessons, videos or notes without permission.
• Every lesson is carefully checked against the references it cites. If you spot an error, please tell us in the comments on our YouTube channel.