A free app for Android, by agent-hp.

Sound Recorder for Android is an app for Android devices that allows users to record audio in the form of WAVE format. 

The recordings can be saved in any folder on the device, and the app provides options to name and save the files. It lets you choose up to three sampling rates; 8,000 Hz, 16,000 Hz, and 44,100 Hz.

You can use this app to record audio notes, interviews, etc. All recordings will be saved in your device’s storage.

If you want to play a recording, simply swipe left to reveal the player tab.

Additionally, you can easily delete or rename your recording via long-press.