AI audio and voice tools generate natural-sounding speech, clone voices, create music, and transcribe or dub recordings. They power audiobooks, podcasts, voiceovers, localization, and in-app assistants.
The main things to compare are voice realism, the range of supported languages, and licensing for commercial use. If you plan to build audio into a product, look for a documented API and clear usage rights; for one-off projects, a generous free tier is usually enough to get started.