Text-to-speech (TTS)
Text-to-speech (TTS) for voice AI
The agent’s voice — natural, streaming speech, in many languages and accents.
Supported providers
Telenow TTS
Telenow in-house TTS — 22 Indian languages + English, voice cloning & design; μ-law 8k telephony, 24k HD on web calls.ElevenLabs
Most natural prosody; great for branded voices.OpenAI TTS
Predictable cost, 6 stock voices.Cartesia
Lowest-latency streaming TTS (Sonic); near-realtime, μ-law 8k direct.xAI (Grok)
Grok streaming TTS — expressive voices + your xAI voice clones, speech tags (laugh, sigh, pause) when expression is on; μ-law 8k telephony, 24k HD on web calls.Soniox
Soniox real-time TTS — 60+ languages with one voice speaking them all (strong Hindi + code-switching), plus instant cross-lingual voice cloning; μ-law 8k telephony, 24k HD on web, gapless streaming.Amazon Polly
AWS Polly neural voices — cheap, many languages, μ-law telephony output.LMNT (Aurora)
Real-time multilingual TTS — low latency, 30+ languages, low cost.Rime
Conversational US-English with accents/dialects; sub-100ms.Sarvam (Indian languages)
Bulbul — Hindi + 10 Indian languages & Indian-English accents.Smallest.ai (Lightning)
Ultra-low-latency TTS — 225+ voices, 30+ languages incl. Indian.Hume (Octave)
Expressive, emotional TTS. Higher latency — warmth over speed.UnrealSpeech
Low-cost streaming TTS — Kokoro voices across English (US/UK) & Hindi.Google Gemini TTS
Gemini 3.1 Flash TTS — 30 voices that each speak 90+ languages, directed in plain English: you write the speaker, the scene and the accent (Indian, American, British…) and the same voice performs it. Inline tags ([whispers], [laughs], [excited]) steer delivery mid-sentence when expression is on. Synthesised a whole turn at a time so the performance never drifts between clauses; μ-law 8k telephony, 24k HD on web.Custom TTS (bring your own endpoint)
Point at any streaming-HTTP TTS endpoint. Describe the request body + audio format once; we reframe the audio to telephony μ-law. MVP: streaming HTTP (mulaw / pcm16 / mp3). $1.00 free credit on signup
Build a voice agent with text-to-speech (tts)
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