This is tape.r0b.io, a fun little web-based microphone for quickly recording things.
tape.r0b.io
To get started you'll need to give the app permission to use your microphone. This app only ever runs on your device and no recordings ever leave your browser, unless you export them yourself.
You've denied access to the microphone.
You'll have to allow access using your browser and refresh this page if you'd like to use tape.r0b.io.