Auphonic is the tool that handles the unglamorous but important final step in podcast post-production: making sure your episode is at the right loudness level for Spotify and Apple Podcasts, encoded correctly, and clean enough to submit. The loudness normalization alone is worth it for podcasters who have published episodes and then noticed they sounded quieter than everything else in someone's feed. The standard target is -16 LUFS for podcasts; Auphonic hits it without requiring you to understand what LUFS means.
The multitrack processing is the advanced use case. If you're recording a two-person show with separate audio tracks per guest, Auphonic can process each track individually, applying different noise reduction profiles based on the recording environment, before mixing them together. For shows with consistent remote guests in unpredictable audio environments, that capability is what produces a professional-sounding final mix without manual EQ work. The free tier at 2 hours per month is enough to test it; the $18/month Basic plan (9 hours per month) covers most weekly podcasters.