A free program for Android, by Kohei Yasui.

You can record your own voice or that of a friend, family member, or anyone else.

This app can be used in two ways:

1) For record. You can record anything – from conversations and lectures to music and speeches. The quality of the recording is very good.

2) For playback. You can listen to your recordings.

The platform supports most audio formats, such as PCM (WAV) and AAC (M4A).

Just hit the red button and you can immortalize the auditory event around you. You can fill the whole session up regardless of time limit because there are none – though this will perhaps depend on your storage capacity.

It is possible to change the sampling rate.