Real-Time Streaming
Sub-200ms first-byte latency for conversational AI and live applications.
Developer API
The Scalable AI Voice API for Next-Gen Applications
Build with confidence. 1000+ voices, 142+ languages, real-time streaming, and industry-leading reliability.
100 free requests/day • No credit card required
Build with Confidence: Speed, Scale, and 142+ Languages
Enterprise-grade infrastructure with 99.9% uptime SLA, global CDN distribution, and the most comprehensive language support in the industry.
<500ms
Average response time
99.9%
Uptime SLA
SOC 2
Compliance ready
Trusted by 3.5m users across 150+ countries
Key Features
Voice Cloning Endpoint
Create custom voice models via API with just 30 seconds of reference audio.
Custom Pronunciation
SSML support and custom pronunciation dictionaries for domain-specific terms.
142+ Languages
Global reach with native-quality voices across 142 languages and regional accents.
Get Started in Minutes
Comprehensive documentation and SDKs for quick integration
Python
import listnr
client = listnr.Client(api_key="your_api_key")
# Generate speech
audio = client.tts.create(
text="Hello, welcome to Listnr!",
voice="en-US-neural-male-1",
output_format="mp3"
)
audio.save("output.mp3")Node.js
const Listnr = require('listnr');
const client = new Listnr({ apiKey: 'your_api_key' });
// Generate speech
const audio = await client.tts.create({
text: 'Hello, welcome to Listnr!',
voice: 'en-US-neural-male-1',
outputFormat: 'mp3'
});
fs.writeFileSync('output.mp3', audio);Built for Every Use Case
From telephony to gaming, our API powers voice applications across industries
IVR & Telephony
Build natural-sounding phone systems with 8kHz telephony-optimized output.
Conversational AI
Power chatbots and voice assistants with real-time streaming responses.
Gaming
Dynamic NPC dialogue and accessibility narration for games.
Content Localization
Localize video, audio, and e-learning content across 142+ languages.
Transparent, Volume-Based Pricing
No hidden fees. Pay only for what you use.
Free
$0/month
- 100 requests/day
- 50+ voices
- Standard latency
Pro
$99/month
- 10,000 requests/day
- 1000+ voices
- Real-time streaming
- Voice cloning
Enterprise
Custom
- Unlimited requests
- Dedicated infrastructure
- Custom SLA
- Priority support
Developer API
Frequently Asked Questions
The Listnr TTS API is a RESTful API that converts text to natural-sounding speech. It supports 1000+ voices across 142+ languages, with features like voice cloning, SSML support, emotion control, and real-time streaming for low-latency applications.
Our API is optimized for low latency. Standard requests complete in under 500ms for most text lengths. Real-time streaming is available for conversational AI applications requiring sub-200ms first-byte latency.
The API supports MP3, WAV, OGG, and FLAC output formats. You can specify sample rates from 8kHz (telephony) to 48kHz (broadcast quality) depending on your use case.
Yes! Our voice cloning API endpoint allows you to create custom voice models from audio samples. Clone voices with as little as 30 seconds of reference audio for use across all supported languages.
Rate limits vary by plan. Free tier: 100 requests/day. Pro: 10,000 requests/day. Enterprise: Unlimited with dedicated infrastructure. All plans include burst capacity for traffic spikes.
Yes, we provide official SDKs for Python, Node.js, and REST. Community SDKs are available for Go, Ruby, and PHP. All SDKs are open source and available on GitHub.
Start Building with the AI Voice API
Get your API key in seconds. 100 free requests daily, no credit card required.