Diktatorial Suite is an online AI-powered audio mastering tool geared for audio pros, musicians and mastering engineers. It lets you master audio tracks with text prompts, and it works with a variety of genres with different options for each. The suite has more advanced options like stereo width, analog warmth and saturation, and has unlimited revisions. It's good for CD releases and for streaming on Spotify and Apple Music.
Another good choice is Cryo Mix, which offers a broader suite of tools for music mixing and mastering. The service lets you upload instrumental and vocal files, set parameters and apply finishing touches to get industry-standard sound. It also includes an AI Audio Separator to extract individual stems, so it's good for beginners. The interface is easy to use, with buttons to save mixes and generate album art from audio.
For a broader range of tools, Databass AI offers a variety of tools including Text-to-Audio, Audio-to-Audio, Stem Splitter and Vocal Styling. The service makes it easier to get creative with audio files, generating lyrics and beefing up vocals. It's got tiered pricing so you can pay for the level of audio processing you need.