OFFICIAL PAGE: Koala Sampler
Koala Sampler is an app which can record anything with your phone’s mic, or load your own sounds. You can then use Koala Sampler to create beats with those samples, add effects and create a track! Koala Sampler now uses AI to automatically create song stems. You can import your own audio files, with many formats supported. You can export your results as professional quality WAV files. Koala Sampler is available for both iOS and Android devices. Details are available at the link above.
Screenshots courtesy of elf audio