mimi.ganba.re is a Japanese ear-training tool. This page describes what data it collects and why. The site is anonymous and no personal data is tracked or stored, but there are some data that are stored on user's device, and some data that are sent to the server.
What's stored locally on user's device
This site stores locally some data to implement its core functionality.
- A randomly-generated device ID, created on first visit
- Per-day correct / total counts, current streak, and per-vowel skill levels
- A rolling log of the quizzes and answers
- A queue of yet-to-be-sent event records
What's sent to the server
This site sents behavioural data to the server for linguistic research purposes. When answering a question, the app sends to server:
- The device ID
- The sounds played and the buttons pushed
- A timestamp, time taken to answer, and the current difficulty level
Is this personal data?
The device ID is a random string of characters. With no personal information attached, it carries no link to a real person, so the event records are anonymous behavioral data — not personal data under GDPR Art. 4(1). Events are therefore sent without a consent prompt. Users' IP addresses are not collected by the operator of this site.
Reminders
If you turn on daily reminders, the app stores a push subscription on the server: an anonymous token from your browser's push service, plus your timezone. It is used only to send the daily reminder. Revoking notification permission or clearing site data drops it.
Third-party tracking
No analytics, no advertising, no third-party scripts.
Deletion
To delete locally stored data: clear your browser data for this site. Events already submitted under the random device ID remain in the database but are not linked or linkable to the device once the client-side data is purged. Because sent data is not personal data under GDPR Art. 4(1), we don't process data deletion requests.
Source code
Available at github.com/golddranks/mimi.ganba.re