If you're looking for a TTS.Monster alternative, PlayHT is a good choice. The service has a large library of more than 600 ultra-realistic AI voices in multiple languages and accents. It also has options for custom pronunciation, voice inflection and real-time voice cloning that could be useful for live streams and personalized interactions.
Another option is Tangia, an all-purpose chat engagement service geared for live streams. It's got Custom AI TTS for personalized voice interactions, AI Conversations for keeping the chat lively, a library of Memes and Interactions, and Soundbites to turn chat-submitted clips into interactive elements. Tangia works on Twitch and YouTube and offers tools to try to get people to engage with your content.
If you need high-quality, natural-sounding voiceovers, Narration Box is worth a look. The service has an easy-to-use interface and a library of 700+ AI narrators in 140+ languages. It's got advanced features like context awareness and emotive styles, so it's good for video voiceovers and live streams.
Acoust is another contender, with natural-sounding AI voices that you can control and customize with emotions. It's also got AI voice cloning, AI translation and speech-to-text transcription abilities, so it's good for social content, e-learning and other purposes. Acoust has flexible pricing options, including a free tier, so it can accommodate different levels of content creation.