Privacy Policy

The following describes how access logs are handled in Futatoki the Learning Clock App (hereafter “this service”, covering both futatoki.app and play.futatoki.app).

Hosting and operational logs

This service is hosted on Cloudflare’s infrastructure. As part of Cloudflare’s normal operation, server execution logs such as request metadata and error logs are retained for a short period. These are used only for incident response and security, never to identify individuals.

Server-side access aggregation

To improve the site and understand access trends, the following items are aggregated on the server side using Cloudflare’s analytics platform (Workers Analytics Engine).

Items recorded:

• Country of access (only the country name as determined by Cloudflare from the IP address; the IP address itself is not stored)
• Browser preferred language (language code only, e.g. ja, en)
• Path of the accessed page
• Referrer domain name (full URL details and query parameters are not recorded)
• Device type (mobile / desktop / tablet)
• Access timestamp
• Source/campaign parameter values — only the values of the src and utm_source URL parameters (e.g. ?src=print on a QR code printed on a worksheet, to understand which channel a visitor came from; values are normalized to lowercase alphanumerics)

Items not recorded:

• IP addresses
• Cookies
• Session IDs, browser fingerprints, or any other information that could identify an individual
• The full browser User-Agent string
• URL query parameters (other than the source parameters listed above)

Retention periods:

• Detailed logs: 90 days
• Aggregated data (weekly / monthly access counts by region or language, etc.): indefinite

The aggregation implementation is open source: github.com/mrksye/futatoki-app

Cloudflare Web Analytics

To grasp overall access trends (total page views, country-level region, browser type, etc.), we also use Cloudflare Web Analytics. Cloudflare Web Analytics does not use cookies, does not track individual users across sessions, and does not collect any personal information. It is a privacy-conscious analytics service.

What we do not use

Apart from the above, no other third-party tracking, ad networks, cross-site identifiers, or fingerprinting technologies are used. No data is sent to any external analytics or advertising provider.