Privacy Policy
Last updated: July 16, 2026 (effective the same day)
mekuru (the "Service") is an early-stage product operated by 8arms LLC (the "operator"). This policy explains what information the Service collects and how it is handled. This is a reference translation; the Japanese version is authoritative.
1. Information we collect
Account information: your email address (only when you create an account).
Guest use: entering a room as a guest automatically creates an anonymous account. No email address is collected, but the usage information and interaction events below are recorded against that anonymous account. If you later register an email address, they carry over to the same account.
Profile information: your display name, and the avatar and book cover you choose.
Usage information: reading session time, your state in the room (reading, on a break, and so on), page-turn signals, and your room furnishing and standing-session settings.
Interaction events: to improve the Service, we record screen interaction events tied to your account in our own database. We use no third-party analytics tools or advertising trackers.
Payment information: paid plans can be paid by credit card. Card details are handled by the payment processor (Stripe) and never reach the operator's servers. Subscriptions are managed through RevenueCat, with which we share a purchase identifier (App User ID), your email address, and purchase and renewal information. The operator keeps your purchase status, purchase history, and the purchase/renewal notifications received from RevenueCat (transaction-related information).
Technical information: cookies for keeping your session. No advertising tracking is performed.
2. How we use it
We use this information to provide the reading rooms (showing your presence to people in the same room), to keep your reading-time records, to reflect your paid-plan status, to send the newsletter (only if you opt in), and to improve the Service. In public rooms, the room's look and presence (shown as lights) also appear in a list outside the room.
We never sell your information to third parties.
3. Storage and processors
Data is stored with Supabase, on Supabase's infrastructure.
We use Stripe for payment processing, RevenueCat for subscription management, and Resend for email delivery. These include processors located outside Japan.
We apply safeguards such as encrypted connections and access controls, and limit access to personal data to what operations require.
We never capture video or audio. The Service has no capability to learn the title or contents of the book you are reading.
4. Disclosure, correction, and deletion requests
To request disclosure, correction, suspension of use, or deletion of your personal data, please contact us at the address below. After verifying your identity, we will respond without delay.
When deleting your account and data, we also request deletion of personal data held by our processors.
5. Operator and contact
Operator: 8arms LLC (合同会社8arms, trading as eight arms)
Representative: Yoshifumi Kondo
Corporate number: 4010403036710
Address: Mitsuhashi Building 3F, 1-3-3 Kita-Aoyama, Minato-ku, Tokyo
Email: info@8arms.io
Web: https://www.8arms.io