How to Use Seeduplex Free — Full Access Guide 2026

How to Access Seeduplex

Seeduplex launched on April 9, 2026 and is already available to all Doubao users. Here's how to access it through every available method.

Method 1: Doubao App (Free, No API Key Needed)

The easiest way to experience Seeduplex is through ByteDance's Doubao app.

Steps:

1. Download **Doubao** (豆包) from the App Store or Google Play
2. Create a free account (or log in)
3. Tap the **voice call** icon in the chat interface
4. Seeduplex full-duplex mode is enabled by default

What you get for free:

• Unlimited voice conversations
• Full-duplex mode (both channels active)
• Noise suppression enabled
• No credit card required

Method 2: Web Interface

Doubao also has a web interface at doubao.com with voice support. The experience is similar to the app, available in modern browsers with microphone access.

Method 3: Seed API (Developer Access)

For developers building applications with Seeduplex:

# Install the SDK
npm install @bytedance/seed-sdk

import { SeedClient } from '@bytedance/seed-sdk';

const client = new SeedClient({
  apiKey: process.env.SEED_API_KEY,
});

// Initialize a full-duplex voice session
const session = await client.voice.createSession({
  model: 'seeduplex-v1',
  mode: 'full-duplex',
  language: 'en',
});

// Stream audio in and out simultaneously
session.on('audio', (chunk) => {
  // Handle incoming audio from the model
  audioOutput.write(chunk);
});

// Send audio chunks as they come from the microphone
microphoneStream.on('data', (chunk) => {
  session.sendAudio(chunk);
});

API Pricing (as of April 2026):

• Free tier: 100 minutes/month
• Pro tier: $0.008/minute
• Enterprise: Contact for pricing

Method 4: This Site

You can try a Seeduplex demo here without leaving this page — no account required.

Tips for Best Results

For the clearest audio:

• Use a good microphone (AirPods or similar work well)
• Minimize background noise for your first test
• Speak naturally — you don't need to wait for pauses

For developers:

• Use WebRTC for low-latency audio streaming
• Buffer audio in 20ms chunks for optimal performance
• Handle the `interruption` event to update your UI state

Troubleshooting

"The AI keeps interrupting me" — Try the Doubao app's sensitivity settings, or reduce background noise. Seeduplex's noise suppression is advanced but not perfect in all environments.

"API key not working" — Seed API access is being rolled out in waves. Join the waitlist at seed.bytedance.com.

"Audio cuts out" — Check your network connection. Full-duplex requires stable bandwidth (>1 Mbps recommended).

Summary

The fastest way to try Seeduplex is through the Doubao app — free, no setup required. For developers, the Seed API provides programmatic access with a generous free tier.

Ready to build something? Check out our API documentation.