Privacy
Last updated: October 2026
The short version
- You can use Lone Pair without an account. Signing in with Google is optional.
- Your drawings and projects stay on your computer (in your browser and in files you save). They are never uploaded to our server.
- If you sign in, we keep your name, email address and when you visit, so we know who uses Lone Pair and can tell you about important changes.
What we keep if you sign in with Google
| Data | Why |
|---|---|
| Your Google account ID, name and email address | To recognise you when you come back, and to contact you about the service |
| When you first signed in, when you last visited, and how many times you have signed in | To understand how Lone Pair is used |
A sign-in cookie (lp_session), valid for 30 days | To keep you signed in. It is strictly necessary for signing in and is not used for advertising |
We ask Google only for your basic profile (name and email). We do not get your password, contacts, files or anything else in your Google account.
What we do not do
- We do not sell or rent your information, and we do not show ads.
- We do not send you marketing emails unless you have agreed to receive them.
- We do not upload, read or store your drawings.
Features that contact other services
A few optional tools send a structure to a public database, only when you click them: Look up name and CAS number and inserting a compound by name (PubChem, US National Library of Medicine), and Find in databases (PubChem, RCSB PDB, ChEMBL, Google). They send only the structure's SMILES or InChIKey, never your account details.
Visitor statistics
We may use Cloudflare Web Analytics to count visits. It does not use cookies or track you across sites.
Where your data is kept
Lone Pair runs on Cloudflare. Account data is stored in a Cloudflare D1 database. We keep it until you delete your account.
Your choices
- Delete your account: sign in, click your name in the top bar, then Delete my account. Your name, email and visit records are removed straight away.
- Sign out at any time from the same menu.
- You can also revoke Lone Pair's access in your Google account settings under "Third-party apps and services".
Contact
Questions or requests about your data: privacy@lonepair.app.