Privacy policy

宮崎 由茉, a sole proprietor in Tokyo, Japan, trading as Murasaki. Questions and requests go to support@murasaki.ai.

• Your email address, and a password that our authentication provider stores as a hash. The password itself stays invisible to us.
• Your purchases: what you bought, the amount, the currency, the language you were reading in, and the identifiers Stripe gives a payment so a receipt can be matched to an order.
• Your progress: which lessons you opened and finished, so the platform can show you where you are and issue a certificate when a course is complete.
• Your conversations with the AI companion, if you subscribe, so a thread keeps a history you can read back.

Card numbers are typed into Stripe’s own payment form and go directly to Stripe. They never touch our servers, our database or our logs. Through the Stripe dashboard we can see the card brand and the last four digits, which is what lets us find your payment when you write in.

Signing in sets a session cookie. It keeps you logged in and is how the site knows which courses sit on your account.

Your cart lives in your own browser’s local storage until you check out or empty it. It stays on your device.

Those two are everything this site stores today. If we ever add a measurement or advertising tool, this page changes before that tool goes live.

Stripe takes the payments and holds the payment record. Our database and our authentication run on Supabase. The pages themselves are served by our hosting platform. The AI companion sends your question, and the lesson text it answers from, to the AI provider that runs the model.

We sell your data to nobody, and none of these providers receive it for advertising.

Account data stays while your account exists. Ask us to delete it and we delete it.

Order records outlive the account, and they have to. A payment, its receipt and the tax record behind it are kept for the period Japanese accounting rules require, so a deleted account leaves behind the order row and the email address it was bought on. The rest goes.

Write to support@murasaki.ai for a copy of what we hold, a correction to something wrong in it, or a deletion. Tell us which email address you bought on so we can find the right records.

The providers above operate servers outside Japan, so your data is stored and processed abroad. Sending us your details means you accept that transfer.

This is sold to adults. If you are under 18, buy with a parent or guardian handling the payment.

This page changes when what we collect changes, and the date at the top moves with it.

support@murasaki.ai