KOLTA Privacy Policy

When you use the App, we collect the following information.

• Display name and icon — Used to show you to members of your space.
• Photos, cut-outs, drawings, and short words you add to the calendar — Stored as the contents of your shared space’s calendar.
• Images of your child’s handwriting — You photograph characters written on paper; the App cuts out each character on your device, and only those character images are stored as the calendar’s lettering. The photo of the paper itself is not sent from your device.
• Images of your child’s drawings, with the drawing’s name, the artist’s nickname, and the date drawn (name and nickname are optional) — You photograph a drawing on paper; the App cuts it out on your device and stores the image as a sticker that members of your space can use. The photo of the paper itself is not sent from your device. We recommend a nickname rather than your child’s real name.
• Nickname and age for a handwriting set (optional) — Used to tell handwriting sets apart. Both are optional; we recommend a nickname rather than your child’s real name.
• Finished calendar pages and that day’s weather (condition and temperature) — Stored so that everyone in the family sees the same page.
• Requests and inquiries — Content you send from "Send a request" in the App, used to improve the App and respond to you.
• User ID (an identifier for authentication) — Used to authenticate and manage your account.
• Device push notification token — Used to send push notifications and to refresh widgets.

We do not collect advertising identifiers and we do not track you. We do not collect contacts, browsing history, search history, or your device’s location. The region (prefecture) you choose for weather is stored only on your device and is not sent to our servers. Location data (GPS) contained in photos is automatically removed before they are shared.

We use the information we collect only for the following purposes.

• Providing the App’s features (displaying and syncing the shared calendar, keeping calendar pages, widgets, and notifications)
• Authenticating users and managing accounts
• Investigating issues and responding to inquiries and requests

Where data is stored and who can access it depends on the type of data.

Images (photos, drawings, handwriting images, and calendar pages) are stored in a way that lets us and the cloud providers described below technically access them to the extent necessary for maintenance and operation. This is not a scheme in which data is encrypted on your device so that even we cannot view it.

The App uses the following cloud services as processors. Information is stored on each provider’s servers.

• Google (Firebase) — Authentication, database, notifications, and server processing.
• Cloudflare (R2 storage) — Storage of calendar photos, drawings, images of your child’s handwriting and drawings, and calendar pages, operated with a private (non-public) configuration.
• RevenueCat — Processing in-app purchases and recording subscription status. It handles an anonymous identifier generated by RevenueCat together with purchase information (product, purchase date, country, and device type). It does not receive our account identifiers or any calendar content such as photos and drawings.
• Apple (WeatherKit) — Weather data. The coordinates of the prefectural capital you select are sent. Our account identifiers and calendar contents are not sent.
• Apple (Private Cloud Compute) — On supported devices, to read and sort the letters and digits written on paper, images of the cut-out characters may be sent to Apple’s servers. The photo of the whole paper, nicknames, and account identifiers are not sent. Apple states that this data is used only for the request and is not retained. On other devices, reading happens only on the device.

These providers handle information in accordance with their own privacy policies and their agreements with us.

Except as required by law, we do not sell or provide the information we collect to third parties without your consent. The external services described above are processors used to provide the App’s features.

Images are kept in private storage, and access is limited to time-limited links for authenticated members. The credentials required for access are not held in the app and are managed only on the server side. Tokens used for invitations are hashed rather than stored in plain text.

You can delete your account from within the App. On deletion, we remove your profile, your notification tokens, and invitation information. Spaces you own are deleted entirely, including their calendars, handwriting, calendar pages, and images.

In spaces owned by someone else, things you placed, handwriting you captured, and pages you finished remain as the family’s record, with the creator anonymized as a "deleted user" (we explain this on screen before you delete). Handwriting sets created by a member who has left can be deleted by the space owner. Calendar pages saved on your device and in your iCloud are deleted together with your account.

Decorations you take off the calendar and characters you have replaced are kept as the family’s record (they appear in the month’s record). When you delete a decoration or a handwriting set, its images are also deleted from our servers. Deleting a handwriting set also deletes the characters it replaced.

The App provides only invitation-based private spaces. There are no public feeds, search, or features for interacting with strangers. Registering a child’s handwriting is intended to be done by a parent or guardian, and the handwriting images are shown only to members you invite. The nickname and age for a handwriting set are optional; we recommend a nickname rather than your child’s real name. Please use the App under the supervision of a parent or guardian.

The App does not display advertising, perform behavioral targeting, or engage in any tracking across third parties.

We may revise this policy as necessary. If we make a material change, we will announce it on this page.

For inquiries about this policy or the App, please contact us at the address below.

void.radius.studio@gmail.com