Support

Questions, bug reports, and feature requests welcome.

Frequently Asked Questions

Is the app free?

Yes, completely free. No in-app purchases, no subscriptions. Ads support maintenance and improvements. Ads are never shown while a visualization animation is playing.

What OS versions are supported?

iOS 17 and later (iPhone / iPad), Android 8.0 (API 26) and later.

Which data structures are included?

Basics (4): Stack / Queue / Array / Linked List
Advanced (4): Tree (BST) / Heap / Hash Table / Graph

How is this related to ARURAKU?

The first information-systems title of the Raku Series, ARURAKU, visualizes algorithms. DATARAKU is its sibling and focuses on data structures. The two apps cross-link, so the heap screen here can jump to ARURAKU's heap sort screen, for example.

How do I change the language?

The app follows your device language (Japanese / English). Change your OS language in Settings.

How do I change advertising preferences?

iOS: Settings → Privacy & Security → Tracking → DATARAKU.
Android: Settings → Privacy → Ads → reset advertising ID. In the EU, the consent dialog may appear again.

How do I report a bug or suggest a feature?

Please contact us via the email below. Including reproduction steps, device model, and OS version is appreciated.

Contact

Fuji Bit Inc.
Email: support@fujibit.com

We typically respond within 2–5 business days.