What Qubit16 stores, and what it doesn’t

Without an account, Qubit16 stores everything — saved circuits, lesson progress, quiz scores, review schedule, preferences — in your own browser’s local storage. None of it is sent to us. You can use the entire course, the simulator and the visualizations this way indefinitely.

With an account, we store the minimum that sign-in and syncing need: your email address, the circuits you save to the cloud, exam attempts and certificates, and your organisation membership if an institution invited you. Progress sharing with an instructor is a separate, explicit switch that is off by default.

• No advertising, no ad networks, no third-party tracking pixels.
• No selling, renting or sharing of personal data with anyone.
• No fingerprinting. Our optional usage analytics keep a random per-tab session id in memory only; it is never written to storage and cannot follow you across tabs or days.
• No reading of your progress by the AI tutor unless you turn on “share my skill map”, and even then it receives a handful of concept names and rounded scores, never your identity.

Sign-in is by magic link: we store your email address and a session token; there is no password. Account data is held by Supabase, our database and authentication provider, in a project we control. Row-level security means your browser can only read your own rows.

To delete your account and everything attached to it, email hello@qubit16.ai from the address on the account. We confirm within a few days. Certificates you earned remain verifiable by their number unless you ask us to revoke them.

When you ask the tutor a question, the text of the conversation and, if you have one open, the circuit in your editor are sent to a language-model provider to generate the answer. Depending on how this deployment is configured that is Google (Gemini), Groq, Anthropic, or Microsoft Azure OpenAI; the page tells you which tier answered. No account identifier is sent with the request. Conversations are not stored on our servers; they live in your browser tab and are gone when you close it.

Do not paste personal data into the tutor. It is a physics tutor, and what you type is processed by the provider under that provider’s terms.

If you submit a circuit to a real device, the circuit (OpenQASM text) and the shot count are sent to the hardware provider — IBM Quantum or Amazon Braket — through our API, which holds the provider credentials. We record the job id, its status and the results so you can retrieve them, and count the job against your monthly quota. The provider processes the job under its own terms.

Card details never touch our servers. If paid plans are enabled, checkout and card storage are handled by Stripe, and we store only the subscription status Stripe reports to us (plan, period end, whether it is set to cancel). During the launch period there is no checkout at all: every new account is on the Pro tier free for 30 days.

The app keeps a small local log of which pages and features you used, in your browser, to power your own Insights page. It is only sent to us if this deployment has an analytics endpoint configured, and never if your browser sends Do Not Track or Global Privacy Control, or if you turn analytics off in the app. It contains no names, emails, question text or circuit contents.

If error reporting (Sentry) is configured, a crash report contains the error, the route and browser details — never the contents of what you were typing.

We set no advertising or analytics cookies. Sign-in uses a session stored by the Supabase client in your browser’s local storage. The app also caches pages for offline use through a service worker; clearing site data in your browser removes all of it.

Qubit16 is for learners of any age, and nothing on it requires an account. Accounts are intended for people 13 and over; institutions running classes with younger students should use seats managed by the institution rather than individual sign-ups.

We update this page when the product changes what it stores; the date below is the last substantive change. Questions: hello@qubit16.ai. The application is open source, so every claim on this page can be checked against the code.