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Inworld Realtime TTS is a real-time text-to-speech technology from Inworld that provides voice models designed for applications requiring fast, realistic, and interactive speech generation. The platform includes Realtime TTS-2, the current flagship model, and Realtime TTS-2 Flash, designed for applications requiring low latency and lower cost, as well as previous Realtime TTS models such as Realtime TTS 1 and Realtime TTS 1-Max. Realtime TTS-2 offers advanced vocal expression and the ability to control delivery style using natural language instructions; it also supports nonverbal cues such as laughter, sighs, breathing, coughing, yawning, and throat-clearing, and a single voice can be used across multiple languages. The platform offers instant voice cloning using a short voice sample, as well as Voice Design for creating custom voices. It also supports control over speech rate, pitch, custom pronunciation, timestamps, and alignment data. Realtime TTS-2 offers a latency of less than 100 ms based on server-side TTFB measurements, while Realtime TTS-2 Flash reaches 25 ms, according to the official website. The current models also support more than 200 languages with multilingual capabilities and language switching using BCP-47 codes.

Coqui TTS is a powerful artificial intelligence technology that converts text into natural speech and reproduces human voices with high accuracy. It allows the creation of voices that can accurately mimic reality from a short voice sample (up to 3 seconds). It also supports Emotion Transfer, so that the synthesized voice can laugh, whisper, or express anger according to the text, making it ideal for game dubbing, audiobook production, and professional film or media production.

Play.ht is an advanced AI voice generation platform that allows users to convert text into highly realistic voiceovers. The platform offers complete control over tone, emotion, and accent, with the ability to clone voices, create podcasts, and integrate realistic voices into apps, games, and smart assistants via a real-time API.