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Your data in this MVP

This is an early testing version on a LexiLuma server. Sign in to save progress and use available personal memory links.

Learning progress

Guest practice results and preferences are saved in this browser. When account sync is configured and you sign in, Kana progress and preferences are also saved on the LexiLuma server, including guest learning you explicitly choose to import. Signing out does not erase browser data. Use each course’s reset control or clear this site’s browser data to remove local copies.

This standalone preview uses one server and backups in Tokyo for learners in Japan and Mexico.

Moving from the preview

The optional Kana transfer file can include your interests and practice history. It stays in your hands until you import it on your chosen new site. Keep it private and delete it when the transfer is complete. Importing saves a backup of any device progress it replaces in this browser.

When you request a personal Kana or Kanji memory link, LexiLuma sends your relevant interests, the character being studied, and recent practice feedback to the OpenAI API. OpenAI processing is not restricted to the Tokyo server. AI-generated links are checked automatically before display. When account sync is available, generated links and related feedback are saved with your account. The course story remains available.

LexiLuma asks the OpenAI API not to store responses as application state. OpenAI says API content is not used to train its models unless the account opts in, and that abuse-monitoring logs may include content and are normally retained for up to 30 days, with stated exceptions. Read OpenAI's data controls. Personal generation has a limited free preview and a server-wide daily limit; it may be unavailable when either limit is reached.

Account sign-in

Email sign-in sends a short, one-use code through Amazon SES. You can create or reset a password with that code, then use the password for later sign-ins. The server stores a salted password hash, not the password itself. It limits code sends and password attempts, and stores your email address, expiring verification data, and expiring login sessions. Resetting a password signs out other sessions. Sign-out revokes the current session. You can delete your LexiLuma account and saved server learning data from the account page. No marketing email is sent.

Shared devices

Browser storage is not a private vault. Sign out when finished and avoid using a shared browser profile for information you want to keep private.

Retention and deletion

Account records remain until you delete your account. Scheduled backups are configured to retain up to eight daily local database copies and a five-copy set of encrypted disk snapshots. We also keep manual database backups and disk snapshots from some releases; these manual copies do not have an automatic deletion schedule. Deleted account data may remain in any backup or snapshot, including a manual copy, until that copy is deleted. Keyed anti-abuse send records can remain after account deletion and are removed by the next daily cleanup after they become one day old.