WellSaid Labs has an AI voice technology foundation that's designed to be easy to use and that lets people quickly create high-quality, natural-sounding audio. It's got a library of AI voices with different tones and accents so you can build a broad range of digital products. It's geared for content creators, marketers and businesses, with flexible production options and a range of pricing plans, including a free trial.
Another good option is ResponsiveVoice, a text-to-speech plugin that offers AI voices in more than 51 languages. The plugin is good for user engagement and is accessible, so it's good for people with vision impairments. It can generate voice in real time, integrate with WordPress and other sites, and offers several pricing options, including a free version.
If you want something more elaborate, LOVO offers more than 500 voices in 100 languages, along with features like voice cloning and auto subtitles in 20+ languages. It can handle audio and video editing and offers a scalable option for businesses, content creators and teachers. LOVO's API lets you integrate it with your own apps, too, so it's a good option if you want high-quality voiceovers.