Apiarium's text-to-speech endpoint converts written text into natural-sounding audio, priced per 1,000 characters and included free on every plan. It's a straightforward addition if your product needs voice output — accessibility features, audio versions of written content, voice assistants, or notification systems.

Because it's free and simple to test, it's worth trying against your actual copy early, since text-to-speech quality can vary noticeably depending on punctuation, sentence length, and formatting in the source text.