Auphonic is described as 'The automatic audio post production webservice, using signal processing and machine learning techniques'. There are six alternatives to Auphonic for a variety of platforms, including Online / Web-based, iPhone, iPad, SaaS and Mac. The best alternative is Alitu. It's not free, so if you're looking for a free alternative, you could try Forecast by Marco Arment or SONE. Other great apps like Auphonic are Speecap (Free), Repurpose (Paid) and Podreel (Freemium).
SONE is an instant podcast mastering service. We bring your podcast sound to the next level with high level audio processing. SONE also works for any other voice recordings like broadcasts, radio shows or reviews.
Speecap is a high-quality voice recording app for iPhone, iPad and iPod touch. Speecap automatically detects and eliminates background hissing noise while recording. No need of expensive professional microphone. Easily make clean speech recordings with any cheap microphone.
Enhanced podcasts are audio recordings that can include chapters, pictures and URLs built-in into any position of their playback. They play beautifully on a variety of devices, including iPhone, iPad, iPod Touch and on PC using iTunes.