1) Record beeps with microphone
Known problems: If you want to retry, you have to reload the page, pressing the "record button" won't work unless you reload. Playback volume doesn't have to be super high, but it is very important that microphone is close to sound source.
Todo: Currently tested only with Chrome. Theoretically will work with any browser that supports HTML5
Todo: Implement zero-knowledge encryption. Currently the data is encrypted, but you do have to trust this site. I will fix this in later versions