Give it an identity
Choose a face, define personality, and assign a voice that sounds unmistakably yours.
Thevideo,voiceandconversationlayerforAI.
Video, voice, and real-time conversation for any being you can imagine, humans, mascots, game avatars, and brand personalities. Built in one studio. Shipped anywhere.
Built for production
Proof, not just a demo.
2,400+teams building
180msmedian voice latency
32languages live
SOC 2Type II
TypeScriptPython · Go
2,400+teams building
180msmedian voice latency
32languages live
SOC 2Type II
TypeScriptPython · Go
Sunesis Studio
One canvas. Every layer.
Voice, video, and conversation, generate, preview, and ship from a single screen. No tabs. No context switching. Just flow.
app.sunesis.ai/studio
Welcome to Sunesis, I can see, hear, and talk back in real time.
Narrate a storyRecord an adGuide a meditation
Sunesis Voice v2Aria · Warm
Generate Generate a character. Talk to it live.
A digital character that sees, hears, and talks back.
Build a character in seconds, choose its face, its look, and its voice, then start a real video call right in your browser. It listens with live speech recognition, replies out loud with natural text-to-speech, and holds the whole conversation in a running chat thread. No clips, no pre-renders. Press the mic and say hello.
- Hears you in real time, replies out loud, no server round-trip
- Full chat thread and live captions as they speak
- Turn on your camera for a face-to-face call, right in the browser
1 · Face
2 · Look
3 · VoiceAria's voice · Warm · Female
Photorealistic · Voice · VideoReady
Aria · Photorealistic
Call Aria, live, right in your browser
How it connects
Build your first character One character. A complete interaction layer.
Let people talk to it
Open a low-latency voice or video call that listens, responds, and takes turns naturally.
Give it work to do
Connect knowledge, memory, and tools so every conversation can lead to an outcome.
Put it where it matters
Ship on the web, in your product, or over the phone from one real-time API.
Voice, video, conversation, and action work from the same character definition.SUNESIS / REAL-TIME STACK
Sunesis Voice
Make every interaction feel considered.
Explore voice, live interaction, and developer tools when this section comes into view.
Flexible ways to build
Start with the moment you want to improve.
Choose the path that fits your team today. Add characters, agents, and developer tooling later without changing the foundation underneath.
Turn one idea into a live interaction.
Move from a brief to a character, voice, or guided conversation without assembling five separate tools.
- Prototype a character in Studio
- Preview voice and video together
- Share a working flow before you ship
One workspace · shared credentials · usage you can see.
DevelopersVoice, video, and conversation APIs built for production.
Voice, video, and conversation APIs built for production.
Fast to start. Open by design.
Build speech, cloning, avatars, and live transcription into one API workflow. TypeScript, Python, and Go SDKs are ready out of the box, with sub-200ms response times.
Quickstart
From signup to your first response in 5 minutes.
No sales call required. Grab your key, paste the snippet, and ship.
import { SunesisClient } from "@sunesis/sunesis-js"; const sunesis = new SunesisClient(); // Stream lifelike speech, token by token const audio = await sunesis.textToSpeech.convert({ text: "Welcome to Sunesis.", voiceId: "aria", stream: true, });
Use cases
What teams ship on Sunesis.
Sunesis
Use case
USE CASE 01Avatar video
Lip-syncable, emotion-aware TTS for AI avatar products. Your digital character speaks with natural prosody and visible emotion, video + voice fused.
Frame-accurate lip syncEmotion-aware prosody
Explore avatar video 
Sunesis
Use case
USE CASE 02Voice agent
Sub-200ms turn-taking over WebSocket. Streaming TTS and ASR so your agent can listen, think, and respond without the awkward pause.
<200ms turn-takingStreaming TTS + ASR
Tap to feature 
Sunesis
Use case
USE CASE 03Audio content & companions
Notes-to-audio, narration, and AI companions that actually talk back. Per-character pricing that scales with usage, not seats.
Notes-to-audioNarration & dubbing
Tap to feature 
Sunesis
Use case
USE CASE 04Conversational apps
Voice cloning from 15 seconds of audio. Persistent memory, function calling, and RAG, build agents that remember and act.
15s voice cloningMemory + function calling
Tap to feature Character, voice & live conversation
Make every interaction feel like it has a point of view.
Create the character and voice together, then deliver a response quickly enough to keep the moment moving.
Character foundation
Start with someone worth talking to.
Set the role, tone, voice direction, and context a character needs before the conversation starts.
Role & point of viewVoice directionContext & guardrails
First response
<200ms
Keep the exchange moving.
Audio begins almost immediately, so a reply does not feel like a loading state.
Languages
32
Work across markets.
Let the same character carry a consistent voice from one language to the next.
Voice sample
15s
Make the voice yours.
Use a short, approved sample to create a voice a character can keep.
4.6 MOS voice qualityMeasured naturalness, not a promise on a slide.
One foundation. Many ways to build.
Compose the interaction your product deserves.
Start with speech, a character, a live session, or an agent, and connect them when the experience calls for more. The same workspace, credentials, webhooks, usage view, and SDK conventions carry across every layer.
Read the platform docsExpressive speech
Generate, stream, or tailor a voice with delivery controls that fit the moment.
Character video
Script or audio to a speaking character production.
Realtime rooms
Run low-friction voice and video exchanges with turn-by-turn events.
Agent runtime
Grounded conversations with memory, tool access, and an optional on-screen presence.
Typed SDKs
TypeScript, Python, Go, REST, and WebSocket examples that match production behavior.
Built to operate
Scoped API keys, audit-friendly workspace controls, and predictable error handling.
Human developer support
Talk to the engineers building the platform when you are designing at scale.
Talk to usThe connected platform
Build one experience. Add depth when you need it.
Start with a single capability, then bring voice, characters, agents, and developer tooling together on the same Sunesis foundation.
Real people
Made for the humans on both sides.
Creators
Clone your voice and narrate anything.
Live conversations
Face-to-face with a digital character.
Support & sales
Voice agents that truly listen.
SUB-200MSLATENCY · VIDEO + VOICE
32 LANGUAGESCLONE IN 10 SECONDS
4.6 MOSHUMAN-LEVEL NATURALNESS
Digital Characters
Real faces. Real conversations.
Click any face to hear them speak.
240+ voices, infinite possibilities, voices uploaded and built by the Sunesis community.
The difference
Not another laggy AI platform.
The others
- Latency500ms+ latency
- Voice qualityRobotic voices
- MemoryNo memory
- Pricing / lock-inVendor lock-in
- Regions / uptimeSingle-region
Sunesis Labs
- Latency180ms latency
- Voice qualityMOS 4.6 naturalness
- MemoryPersistent memory
- Pricing / lock-inOpen API, no lock-in
- Regions / uptime14 regions · 99.99% uptime
Customer outcomes
Powering voice and video for 2,400+ teams.
From new products finding their voice to public companies redesigning a customer journey, teams use Sunesis to make the interaction count.
Voice agents“We replaced our entire IVR with Sunesis agents. Call deflection jumped overnight and our support costs dropped by 64%.”
Mara Lindqvist
VP Engineering, Northwind
Digital characters“Onboarding completion went from 41% to 89% once we added a face-to-face digital character to the flow.”
Dev Patel
Head of Product, Koru Health
Real-time API“We ran 40k concurrent voice sessions during launch week without a single dropped call. The streaming latency is unreal.”
Sofia Marchetti
Staff Engineer, Helio
In the wild
The product is part of the conversation.
Creators and developers share the moments that make a voice experience feel different.
“Cloned my voice in 15 seconds and it nailed my cadence on the first try. Wild.”
@creatorkai@YouTube
“The streaming TTS feels instant, my viewers think I'm live when I'm not.”
@novastreams@TikTok
“Built a customer support agent in an afternoon. It's better than our offshore team.”
@indiehacker@Twitter
“Finally a voice API that doesn't sound like a robot from 2015.”
@devjules@YouTube
Plans that grow with you
Explore pricing Start building now. Choose a plan when it matters.
Explore credits, production features, and team options on the pricing page, without interrupting the product story.
The real-time backbone
The details that make an interaction feel instant.
Every layer is measured for the moment between a person speaking and the system responding.
0.0k
teams building on Sunesis
0ms
median latency, voice generation
0
languages for live conversations
0.0
MOS, human-level naturalness
Streaming voice · character video · grounded agentsMeasured in production, not just in a demo
Explore Sunesis
Find the right part of Sunesis.
Start with the product, plan, or team information that matters to you.
FAQ
Questions, answered.
Sunesis Voice v2 speaks 32 languages out of the box with any of our 240+ voices. The API supports 30+ languages including English, Spanish, Japanese, French, German, Mandarin, and more, all with native-quality prosody and the ability to clone a voice and use it across languages.