Privacy notice

Effective November 3, 2026. Cellcraft is owned and operated by Chip Sineath. Privacy requests: chip.sineath92@gmail.com.

Practice without an account

You can try the lessons without signing in. Your browser stores your nickname, completed quests, practice dates, XP-related state, review list, shortcuts, settings, and recent practice events in local storage. Exported save files contain learning progress and your nickname. Clearing this site’s browser storage removes those local copies.

Signed-in learning

Cellcraft uses Sign in with ChatGPT to associate your account with saved progress. Cellcraft stores a site-scoped account identifier and display name, rather than a separate email/password account. The server processes submitted formulas and workbook projects to check completion. Saved learning records include per-quest attempt counts and correct attempts, completion state, workbook project drafts, project passes, and completion timestamps. These records support your learning summaries, cross-device progress, and course requirements. Do not enter confidential data or passwords into practice fields.

Completion credentials

We create a public certificate record only after you explicitly request one and confirm the public information disclosure. We store your chosen learner name, course and version, issue date, unguessable credential ID, and status. Anyone with a valid credential link or ID can see the learner name and those completion details. The public record does not expose your account identifier or individual answers. A downloaded or shared certificate may remain in another person’s possession after you remove the hosted record.

Service improvement and feedback

We use aggregate learning and service summaries to identify confusing lessons and technical failures. These are derived from records needed to provide signed-in learning. We do not load external analytics, advertising pixels, or marketing trackers, and there is no separate email list. Feedback you choose to submit is stored so we can investigate and improve the service. Support emails are processed to respond to your request. Do not include sensitive information.

Hosting and sign-in

Website hosting and sign-in providers process technical requests to deliver and secure the service. This can include network addresses, request times, browser details, and authentication information under their own service arrangements. Cellcraft does not sell your learning records or use them to target advertising. Links to external documentation and social platforms follow those services’ privacy policies.

Your controls and deletion

Use your account to export or delete server-stored learning and credential records. Local browser records are separate: reset them in your journal or clear this site’s storage. We keep account, progress, feedback, and credential records to provide the service until deletion, subject to any information we must retain under applicable law or for an active security issue. Contact us to request access, correction, or help with deletion. We may confirm ownership before acting.

Your choices

Practice anonymously, export a local save, choose whether to submit feedback, and decide whether to issue or share a public certificate. Cellcraft is intended for adult learners and is not directed to children under 13; contact us if you believe a child’s personal information was provided.

Changes

We will update this notice when data practices change. A future newsletter, paid plan, or new analytics service will need its own accurate disclosure before it is introduced.