Sample
Sample A
Same Hindi line
Early access
The cheapest TTS API for voice agents.
₹200 per million characters, with instant voice cloning.
Fast enough for live conversation.
Blind listening test
Same Hindi line from three providers. Listen, vote for the one you would ship, and we reveal who made which.
Sample
Sample B
Same Hindi line
Sample
Sample C
Same Hindi line
Reference
Sample D
Metrics only
No audioInstant voice clone not supported.
Revealed with the results.
Playback copies are loudness-normalized.
Platform
Drops into the stack you already run.
Ultra speaks the same API as Cartesia. Change the URL and key in your LiveKit agent and you are done.
- ✓ Clone a voice from one consented clip of 3 to 30 seconds. Adjust speed, pitch, and clarity without re-cloning.
- ✓ Streaming over HTTP or WebSocket, with cancellation mid-sentence.
- ✓ Console for voices, API keys, team workspaces, and usage.
from livekit.plugins import cartesia
# Ultra speaks the Cartesia protocol. Swap base_url and key.
tts = cartesia.TTS(
api_key=os.environ["ULTRA_API_KEY"],
base_url="https://api.ultra.example",
model="ultra-hindi-v1",
voice="default",
language="hi",
encoding="pcm_s16le",
sample_rate=24000,
)
session = AgentSession(stt=stt, llm=llm, tts=tts)Pricing
₹200 per million characters. No minimum.
Launch pricing. Volume terms as you grow.
Savings calculator
Your current bill against Ultra at the same volume.
≈ 87,00,000 characters at 870 characters per minute.
Usage cost only. Excludes minimums, taxes, FX, and negotiated discounts. Competitor rates are public list prices.