← Derakkuma

Privacy Policy

Last updated: May 26, 2026

1. Summary

Derakkuma is designed to keep your maimai DX NET session and cached data on your device. Your data does not leave your device unless you explicitly use or enable a feature that sends it elsewhere.

2. Data stored on your device

Derakkuma may store your maimai DX NET session, cached profile information, scores, friends, friend code, game settings, cabinet-location cache, app settings, and related data locally on your device so the app can work and show cached data.

3. maimai DX NET

When you use Derakkuma to view or change maimai DX NET data, the app communicates with maimai DX NET using your session. That communication is between your device and maimai DX NET.

4. Optional AT Protocol/Bluesky sharing

If you connect AT Protocol/Bluesky features and enable publishing, Derakkuma may publish the categories of data you select, such as player profile details, records, favorites, friend discovery information, or other selected updates. These features are opt-in and can be disabled in the app.

5. Optional Bubble nearby sharing

If you start Bubble, Derakkuma broadcasts a compact Bluetooth Low Energy signal so nearby Derakkuma users can discover you. Bubble is opt-in and may broadcast your maimai friend code in order to let nearby players find your profile and send a friend request. Nearby users may use that friend code to fetch your visible maimai profile details, such as name, icon, and comment, through maimai DX NET.

6. Optional location features

If you grant location permission, Derakkuma may use your location on-device to sort nearby maimai cabinet locations. Cabinet location data may be cached for performance. Your location is not intentionally sent to Derakkuma servers.

7. Donations

If you use donation features, payment processing is handled by Stripe. Derakkuma may use a donation session identifier and a one-way hash of your friend code to verify or restore donation unlocks.

8. Analytics

Derakkuma includes basic and anonymous app analytics via Posthog. Analytics can be opted out from app settings when available. Analytics will never include any personally identitifying information, such as maimai DX NET credentials or identities.

9. Unofficial app

Derakkuma is an unofficial maimai DX NET client and is not affiliated with or endorsed by SEGA. Your use of maimai DX NET through Derakkuma should follow the official maimai DX NET Terms of Service and SEGA FAVE Privacy Policy.

10. Contact

Questions or issues can be filed on GitHub or by emailing admin@derakkuma.com.