Privacy policy
Know It Cold is built and run by one independent developer. This page says, as plainly as we can, what the app stores, who else touches it, how long it is kept, and how to have it deleted. Nothing here is hidden in a longer document elsewhere; this is the whole of it.
What we collect
- Your Apple sign-in. Sign in with Apple gives us a stable identifier for your account, your name if Apple shares it, and an email address. If you use Hide My Email, the address we hold is Apple's relay address, and we cannot look up the real one. We use the email only to tell accounts apart when running the service; we never send mail to it, and there are no notifications, newsletters, or invitations.
- Your learning data. The topics you create, the curricula built for them, your progress through them, your review history and scheduling state, your vocabulary entries, your written answers, and the conversations you have with the tutor. This is the product; without it there is nothing to review.
- Usage of the AI model. For every call the service makes to the AI model on your behalf we record which account made it, which part of the app, the model used, how many tokens went in and out, and how long it took. This is how the spending limit on each account is enforced.
- Error reports. When the app hits an error it records the message, where in the code it happened, which screen you were on, and the build, and sends that to the service the next time it launches, linked to your account. It lives in the service logs for 7 days. The Settings screen shows how many reports are waiting to be sent and lets you discard them first.
We do not use advertising, analytics or tracking SDKs, and we do not sell or share personal data with anyone for their own purposes. The app has no third-party code that reports on you.
Who processes it
- Cloudflare hosts the service and stores your learning data and the usage records above.
- Anthropic provides the AI model that acts as tutor, curriculum designer and grader. The text of your tutoring conversations, your written answers and the material being taught is sent to Anthropic to generate the tutor's replies and grades. It is sent through Cloudflare's AI Gateway, which also keeps a log of those exchanges (see below).
- Apple handles sign-in. What Apple does with your Apple ID is covered by Apple's own privacy policy, not this one.
Logs, and who can read them
This is the part most apps leave out, so it gets its own section.
- Service logs record every request the app makes, and they include the content: what you wrote, what the tutor replied, and the full exchange with the AI model. They are kept for 7 days and then expire.
- AI Gateway logs keep the complete request and reply of each model call, including that same content. These do not expire on a fixed schedule; they are kept until deleted, and they are deleted when you ask us to delete your account.
- The developer can read these logs, and does, to diagnose problems and to improve how the tutor teaches. You should expect that anything you write to the tutor can be read by a person. Do not put in a tutoring conversation anything you would not want a person to see.
How long we keep it
Your learning data is kept for as long as you have an account; usage records, which hold no content, are kept after it. Service logs expire after 7 days. AI Gateway logs are kept until your account is deleted. The Settings screen's erase button removes the copies of your conversations kept on the phone, which are cleared on their own after 30 days in any case. The service keeps conversation text only in the logs described above.
Deleting your account
In-app account deletion is not available yet. Until it is, email knowitcold@chaag.dev from the address on your account and we will delete the account, all learning data stored under it, and its AI Gateway logs. Service logs expire on their own within 7 days. The usage records, which hold counts of model use and no content, are kept after the account is gone as the record of what the service spent.
Children
Know It Cold is not directed at children under 13 and we do not knowingly hold an account for one. If you believe a child has created an account, email us and we will delete it.
Changes
If this policy changes, the effective date at the top changes with it, and the new text replaces this one at the same address. We will not quietly widen what we collect.