Auphonic

Auphonic is a web service for the part of making a podcast that most people never learn: audio post-production. You upload a raw recording, pick a preset, and its algorithms return a mastered file — no compressor settings, EQ curves or loudness meters to understand. The Graz-based company has been doing this since 2013 and says more than two million people use it, from first-time hosts to shows like the Lex Fridman Podcast and The Diary Of A CEO.

The processing chain combines machine-learning classifiers with conventional signal processing. Noise and reverb reduction can remove only static hum or also fast-changing background sounds, and lets you choose whether music and breaths stay in the mix. The Adaptive Leveler balances loudness between speakers and between speech and music; AutoEQ builds a separate, time-varying EQ profile per voice and handles de-essing and plosives; the newer Studio Voice model reconstructs clipped, codec-damaged or low-bitrate speech and restores missing high frequencies. Automatic cutting removes silences, coughs and filler words such as "uhm" in several languages, and the final mix is normalised to a loudness target of your choice.

Multitrack productions take one file per speaker plus music, sync the tracks, and apply ducking, a noise gate and mic-bleed removal before mixing down. Speech recognition (Whisper-based) produces transcripts, subtitles, chapter marks and automatic show notes, and video or audiogram output is supported. A browser-based Audio Inspector shows input and output waveforms with every cut and algorithm segment, so you can review, undo or add edits before export, or export cut lists to a DAW or video editor.

Auphonic is built for repeatable workflows: presets, batch processing, watch folders, file transfer to and from services like Dropbox, Google Drive and SFTP, automatic publishing to hosting platforms, a Zoom integration, a REST API and a command-line client. Pricing is by processed audio time. The free plan covers 2 hours a month (free productions carry an Auphonic jingle); recurring plans run from 9 to 250 hours a month, and one-time credits that never expire are sold in packages from 5 hours upward.