Privacy Policy

Effective date: November 15, 2026

This policy explains how JP Decoder ("we," "us," or "our") collects, uses, and shares personal information when you visit our website, sign up for our free sample, buy our app, or contact us. JP Decoder is run in Japan by Kei Kitamura, doing business as Yu trade.

Information we collect

When you sign up for the free sample: your email address.

When you buy on Gumroad: Gumroad shares your name, email address, what you bought, the price paid, and your country with us. Gumroad processes your payment; we never see your full card number.

When you email us or use our contact form: your name, email address, the topic, your Gumroad receipt or order email if you give it, the page you sent it from, and your message. Messages from the form are emailed to us; we don't keep them on our website.

Your progress in the app (what you've learned, bookmarks, notes, settings) stays in your browser on your device. In the full app on Gumroad, Gumroad saves it for your account so you can pick up where you left off. We don't receive it.

Information collected automatically: Cloudflare, which hosts our website, processes technical information such as your IP address, browser and device type, and the pages you request, to deliver our pages and keep the site secure. Our contact form uses Cloudflare Turnstile to check that a person, not a bot, is sending it; Turnstile may process technical information about your browser for this check. To limit repeated submissions, our forms briefly use a scrambled (hashed) form of your IP address, which we don't store. Our website doesn't use advertising tags, and we don't set our own cookies.

How we use your information

to send you the free sample and our welcome emails about learning real Japanese and our full app
to deliver what you bought and support you, including refunds
to answer your questions
to keep records required by law, such as accounting and tax records
to protect our website from spam and misuse

Emails: When you sign up for the free sample, we send you the link and a short series of emails, and occasional news about JP Decoder. Every email has an unsubscribe link. Unsubscribing doesn't affect anything you've bought.

We don't sell your personal information.

Who we share your information with

Kit (ConvertKit) stores your email address and sends our emails. Countries: the United States and other countries.
Gumroad runs our checkout, delivers your purchase, saves your app progress, and handles payments and taxes. Countries: the United States and other countries.
Cloudflare hosts our website, runs our signup and contact forms, and provides Turnstile. Countries: the United States and other countries where Cloudflare has data centers.
Resend sends messages from our contact form to us, and sends our replies. Countries: the United States and other countries.
Our email provider, which we use to read and reply to your emails.
Authorities, when the law requires it.

Each of these companies handles information under its own privacy policy. We're based in Japan; these services process information outside Japan, in the countries shown. Japan's Personal Information Protection Commission publishes information about the privacy laws of other countries, including the United States (in Japanese).

How long we keep your information

Your email address for our emails: until you unsubscribe or ask us to delete it.
Purchase records: for the period required by Japanese accounting and tax law.
Your emails with us: 1 year after your last message.

Your choices and rights

You can ask us to tell you what personal information we have about you and send you a copy, correct it, or stop using it and delete it. Email [email protected] from the address you used with us. We reply within 2 business days. We may need to keep some records for the period the law requires.

Children

Our website is not directed to children under 13, and we don't knowingly collect personal information from them. If you believe a child under 13 has given us personal information, please contact us and we will delete it.

Changes to this policy

If we change this policy, we'll post the new version on this page and update the effective date. If the changes are important, we'll also tell you by email.

Contact us

Kei Kitamura, doing business as Yu trade (JP Decoder)
Email: [email protected]
We reply within 2 business days. We will provide our address without delay on request.