This is the best voice recorder available on the play store without ads. It supports two audio formats i.e wav, m4a.
App appearance is customisable, you can choose your own theme from a list of themes.

Features:
-Share your recorded files
-Upload recorded files
-Trash feature to keep your deleted files
- Recording audio
- Playback records
- Supported recording formats M4A and WAV
- Set sample rate and bitrate
- Record and Playback in background
- Display record waveform
- Rename record
- Share record
- Import audio files
- Records list
- Add the selected record to bookmarks
- Colored themes