TTS API 4

Instant, natural-sounding AI text-to-speech API and no-registration playground. GPT Realtime 2 is an AI-powered platform designed for instant, natural-sounding audio generation and text-to-speech (TTS) services. It provides a no-registration playground where users can transform text into speech using various AI voices like Alloy, Echo, and Shimmer. For developers, it offers a production-ready API route via OpenRouter, specifically utilizing the openai/gpt-audio model. The system supports streaming audio responses, transcript feedback, and multiple output formats, making it a comprehensive tool for building voice-enabled applications and workflows.

Ultra-low-latency voice AI APIs for speech generation, transcription, translation, and cloning Gradium is a voice AI platform for developers that provides ultra-low-latency text-to-speech, speech-to-text, speech-to-speech translation, live translation, voice cloning, and on-device text-to-speech through a unified API. It is designed for building real-time voice agents and conversational applications, with expressive speech generation, accurate transcription, multilingual support, speaker cloning, bidirectional WebSocket streaming, scalable concurrency, and deployment options including cloud, dedicated instances, self-hosted, and on-premises infrastructure.

Unlimited text-to-speech and voice cloning priced per concurrent stream. Gandr is a text-to-speech and voice-cloning platform for generating real-time and long-form audio. It supports 23 languages, instant voice cloning from approximately ten seconds of reference audio, streaming audio, HTTP narration and dubbing, and WebSocket voice-agent integrations. Gandr uses flat, unmetered pricing based on concurrent streams rather than characters, minutes, voices, or requests. Its audio is watermarked, user data is not used for training, and the platform offers integrations with LiveKit, Pipecat, Vapi, Retell, Daily, and Whisper.

Nepvox AI is an all-in-one voice and image generation platform offering powerful Text-to-Speech (TTS), Speech-to-Text (STT), and Text-to-Image (TTI) capabilities. Designed for creators and developers, Nepvox combines high-quality voice synthesis, fast API integration, and affordable pricing — making it a perfect alternative to expensive voice AI tools. Nepvox AI provides a complete suite of tools for voice and image generation with flexible usage and advanced customization. Users can enjoy up to 3 million characters per month, generate 50 AI images, and fine-tune voice output with adjustable speech rate, pitch, and volume. Choose from multiple voice styles such as friendly, emotional, or professional to match any project tone. Developers can seamlessly integrate Nepvox’s TTS and STT APIs, while creators can download high-quality MP3, WAV, or OGG audio files. Additional features like audio merging, priority support, and lifetime access options make Nepvox an ideal choice for anyone looking for a reliable, feature-rich, and cost-effective AI voice solution.