For https://www.asmusictheory.com, I built in a spaced repetition test section to aid memory retention, along with "a free play" mode for when you just want to explore.

No sound on an iPhone. They keyboard visually responds.

Tried safari and Firefox focus

Thank you for your feedback - I have it working on iPadOS 26.5 (Chrome and Safari). The browser auto-play policy does require some interaction with the page before it will play (so the first key press is often mute, but should sound after). There is a button on the control bar to enable sound explicitly. I will look for more instances (not to ask the really obvious question, but do you have sound turned up or a bluetooth connection you're not aware of by any chance?). Thanks again

looks fantastic, just what I was looking for. will try, tyvm

Thank you. Any feedback would be greatly appreciated :)