A roleplay environment built on real-time voice + AI

Kotonia's character voice chat runs on a real-time VAD + STT + LLM + TTS pipeline. Speak into the mic and the AI replies in voice instantly, with synced lipsync avatars for personas that have an avatar registered. Optimized for language practice, roleplay, casual conversation, and emotional companionship — building relationships through voice.

11 langMultilingual TTS

Free tier20 calls/day

LipsyncAvatar sync display

Real-time multilingual voice chat

High-quality TTS in 11 languages including Japanese, English, Chinese, and Cantonese (Qwen3-TTS). Speak and the pipeline runs STT → AI → TTS back to you instantly.

Public personas + your own

Talk to personas published by other users. You can also save and grow your own personas.

Lipsync avatar display

Register an avatar image to a persona, and Ditto syncs the character's mouth movements to the generated speech in real time.

Saved conversations

Sessions persist with full history. Reference past exchanges and grow the relationship over time.

Language partnerRoleplay scenariosCasual conversationEmotional companionVoice-input draftingPresentation rehearsal

Basic usage

Pick a persona

Choose from public personas — language tutors, casual chat partners, roleplay characters, and more.

Grant mic permission

The browser will ask for microphone access on first use. Once granted, subsequent sessions start with one click.

Speak into the mic

Press the mic button and talk. VAD auto-detects end of utterance and the AI replies in voice instantly.

Continue across sessions

Conversations save automatically per session. Pick up where you left off and the AI remembers what was discussed.

Sample conversation

Pick a persona, talk into the mic, and the AI replies in voice. Avatars sync mouth movements when registered.

You

Be my English practice partner today — I have a job interview coming up.

Persona: Ryan (English tutor)

Ryan

Sure! Let's start with the classic question. Tell me about yourself — in 30 seconds.

Language: English / TTS: Qwen3-TTS

You

I'm a software engineer with five years of experience...

Ryan

Great opening. Try not to start every sentence with "I" — switch it up. Want me to give you a corrected version?

Pronunciation + grammar feedback

Supported voice languages

11 languages with voice input and output (Qwen3-TTS), focused on Japanese, English, Chinese, and Cantonese. Switch language per persona.

日本語 (JP)English (EN)中文 (ZH)粤語 (YUE)한국어 (KO)Español (ES)Français (FR)Deutsch (DE)Italiano (IT)Português (PT)Русский (RU)

Pairs with other features

Character Voice Chat gets stronger when combined with the rest of Kotonia — pick a partner from the public persona library, or jump into a packaged experience like Sassy AI English.

Public persona library

Pick from AI characters built by other users and start voice chatting instantly. Fork the ones you like to customize.

Learn about personas →

Sassy AI English Tutor

A packaged version focused on language learning — gets sassy with you to correct pronunciation. An example of a vertical product built on voice chat.

See Sassy English →

Try free voice chat now

One-minute signup, no credit card. 20 multilingual voice chats per day on the free tier.

Start free View pricing