Privacy Policy

Last updated: 2026-05-12

Sand Chemistry is a teaching tool for organic chemistry. This page explains what we collect, why we collect it, and what we do not do with it.

What we collect

• Google profile data, when you sign in. Your name, email address, profile picture, and a Google-issued user identifier (sub). Google sign-in is optional. The site works without it.
• Chemistry inputs. The SMILES strings, reaction questions, and feedback you submit are sent to our backend for prediction and caching. We may store them to improve the service and avoid re-asking the upstream model for the same reaction.
• Usage analytics. We record which tabs you visit and which reactions you predict in aggregate, so we can prioritise reaction families that students actually use. We do not record keystrokes or mouse movements.
• Local storage on your device. Your saved reactions, quiz progress, and preferences are stored in your browser. They are not synced to our servers today.

What we do not do

• We do not sell your data.
• We do not share your data with advertisers.
• We do not use your Google profile for anything other than identifying you when you return to the site.

Third-party services

Predictions are produced by IBM RXN for Chemistry. Your inputs are sent to IBM's API to generate the prediction. Sign-in is provided by Google Identity. Hosting is provided by Railway (backend) and Vercel (frontend). Each service has its own privacy policy.

Children's privacy

Sand Chemistry is built for college-level chemistry students and is not directed at children under 13. If a parent or guardian believes a child has signed in, please contact us and we will remove the account.

Your choices

• You can use Sand Chemistry without signing in. Your settings and saved reactions will live only in your browser.
• You can sign out at any time from the Account page. We do not delete your saved reactions when you sign out, because they live in your browser.
• To request deletion of any data we hold tied to your Google account, email hello@sandchemistry.com.

Changes to this policy

If we make material changes, we will update the "last updated" date at the top of this page and, for signed-in users, surface a notice on next sign-in.

Contact

Questions about this policy: hello@sandchemistry.com.