What's the best Android app for recording very quiet sounds clearly?

Voice Recorder is a straightforward Android application designed for capturing audio with an emphasis on sensitivity, making it well-suited for recording subtle sounds. The app excels in scenarios where audio detail is critical, such as prenatal bonding by recording fetal heartbeats, documenting nature sounds like bird calls, or capturing whispered notes in quiet environments. Key features include adjustable gain control to amplify faint audio, a minimalistic one-tap recording interface that reduces setup time, and support for common audio formats like MP3 for easy sharing. Users report that it can pick up the quietest of sounds very clearly, with one review noting its effectiveness for recording a baby's heartbeat in the womb. However, the app's simplicity may be a limitation for those needing advanced editing tools, and background noise can occasionally interfere if not in a controlled setting. For real-world use, it performs reliably in low-volume situations, though positioning the device close to the sound source is often recommended for best results. Overall, Voice Recorder balances accessibility with capable audio capture, providing a practical solution for everyday recording needs without overwhelming users with complex options.