You might ask
Is HengHeng free?
The core tools are free — just open the page.
Do I need to install anything?
No. The web version runs in your browser; iOS/Android apps are on the way.
Does it work on mobile?
Yes, phone and desktop. On phone, turn off silent mode or use headphones for sound and mic.
Do I need music theory?
No. HengHeng turns abstract sound into visual feedback — beginners welcome.