There aint any 1 or 2 btw. You can record, twist, and visualize 3s-long clips in your browser. Pure JS/HTML/CSS.
(bootstrap tho)
https://github.com/yunusemrejr/whispery3 (<a href=https://github.com/yunusemrejr/whispery3 >here</a>)
Updates
Whispery 3 - my new open-source audio messing tool