The most expressive, interactive AI avatars. Built to connect.

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Build interactive avatars that can listen, talk and respond directly inside your product or website.

Ultra-low latency · Unlimited custom avatars
1000+ concurrency · 24-hr long calls

As featured in

The New York TimesForbesTechCrunchGizmodo
Microsoft
“[The avatar] is so lifelike. It is state of the art. It has been such a pleasure for us at Microsoft to work with LemonSlice.”
Brad Smith · President of Microsoft

What is an interactive avatar?

An interactive avatar is a digital character that can listen, talk, and respond to users in real-time within a video call. Unlike static video avatars that play pre-recorded clips, LemonSlice's interactive avatars generate every frame on the fly so the lips, facial expressions, and body language all move naturally. Whether you need a photorealistic AI assistant for customer support or a cartoon mascot for education, any character with a face can become an interactive AI avatar in minutes.

Cartoon avatar of a woman ready to animate with the LemonSlice API

Step 1: Pick or upload any image.

Upload a photo of any character. No training, fine-tuning, or character rigs required. If it has a face, LemonSlice can animate it.

ElevenLabs v3
Sonnet 4
OpenAI Voice
Gemini Pro
Cartesia Sonic-3
GPT-5.5 Mini
Gemini Audio
Qwen3 235B
Hume

Step 2: Connect any LLM/voice model.

Plug in any language model, voice provider, and knowledge base through LemonSlice's API. OpenAI, Claude, ElevenLabs, Cartesia, and more.

Step 3: Go live with ultra-low latency.

Deploy to your site with a widget, hosted pipeline, or self-managed pipeline. LemonSlice runs at 471ms p99 latency, so conversations feel instant.

We train foundational Character World Models from scratch: interactive avatars that can listen, talk, and act in real-time.

Our mission: build the emotional engine for AI.

Learn more

CWM-1

A state-of-the-art Character World Model (CWM) for interactive avatars.
Coming soon.

LemonSlice-2.1

20B parameter model that animates any character at 20 fps on a single GPU from just 1 photo.

The most advanced interactive avatar model in the world.

Avatar library
Make your own

Any character. Any style.

LemonSlice is the only interactive avatar model that can animate non-humans - like a turtle or a smiling teacup - as easily as humans.

  • Non-humans
  • Cartoons
  • Photorealistic humans

Ultra-low latency

The fastest response time of any major avatar provider.

  • 471ms - about the blink of an eye
  • The industry's fastest p75 through p99
  • Optimized for real-time conversation
Read technical report

Full-body motions

LemonSlice is the only interactive avatar model that can animate hands and whole body in real-time.

  • Natural hand gestures
  • Whole-body motions, like dancing
  • Director-level control

Emotional states

Have director-level control over your avatar's emotions via tool calls.

  • Trigger any emotional state
  • Anger, sadness, happiness, and more
  • Lifelike and dynamic micro-expressions

Image-to-avatar

Turn any image into an interactive avatar instantly. No training or fine tuning required.

  • Just one image. Instant avatar creation.
  • Unlimited avatars
  • Update the clothes or setting in real-time
Make your own

Character world models

Our novel architecture demonstrates emergent world-modeling, physics simulation, and spatial understanding.

  • Animated backgrounds
  • Physics-based simulations
  • No setup required
“I couldn’t have imagined an avatar could be as alive as this. [The avatar] showed absolute emotion and fire. It felt like a real conversation. It seemed magical.”
Doris Kearns Goodwin · Pulitzer Prize-winning historian

Set up an agent in 5 minutes with our developer-friendly API.

Add LemonSlice avatars to the custom stack you already use or drop a hosted widget into your website with two lines of code. LemonSlice is built to be API-first.

Get an API Key
Example projects
Read the docs
5 minute quickstart
Choose a code example
Quickstart RepoLivekit Docs
async def my_agent(ctx: agents.JobContext):

    avatar = lemonslice.AvatarSession(
        agent_image_url="https://lemonslice.com/image.png",
        agent_prompt="Talk with hand gestures.",
    )

    session = AgentSession(
        stt="deepgram/nova-2",
        llm="openai/gpt-5.3-chat-latest",
        tts="cartesia/sonic-3",
    )

    await avatar.start(session, room=ctx.room)
    await session.start(
    )

Where teams use interactive avatars

Put a face on the agents you already run. Anywhere you have a chatbot or voice agent, add a talking, listening avatar the same day.

Education and training

Build AI tutors, language coaches, and onboarding guides that speak and listen in real time. LemonSlice avatars make digital learning personal — boosting engagement, retention, and completion rates across any LMS or training platform.

Entertainment

Create lifelike digital characters for games, social apps, and interactive media. From AI companions to virtual streamers, LemonSlice avatars deliver real-time expression and voice that keep audiences captivated.

Physical installations

Deploy AI-powered greeters, wayfinders, and concierges on kiosks and displays in retail, hospitality, and public spaces. LemonSlice avatars turn passive screens into memorable, face-to-face customer experiences.

Business

Add a human face to customer support, sales assistants, and internal tools. LemonSlice avatars integrate with your existing chatbots and voice agents to increase trust, resolution rates, and user satisfaction.

Built for enterprise scale

Thousands of concurrent calls

Run thousands of simultaneous avatar sessions — built for high-volume production workloads.

Multi-region servers

Deploy avatar sessions from the region closest to your users for lowest latency.

Zero data retention mode

Run avatar sessions without storing conversation data — built for privacy-sensitive enterprise workflows.

Models available for every use case

LemonSlice Lite is our low-cost model for consumer interactive avatar apps

  • Low cost
  • Ultra-low latency
  • High volumes
  • Instant character creation
Request a demo

LemonSlice Pro is our high-res model for large-format displays and physical installations

  • High resolution
  • Physical installations
  • Exceptional visual quality
  • High-fidelity characters
Request a demo

The White House and Microsoft collaborate with LemonSlice

LemonSlice powers a life-size, conversational AI avatar at the opening of the new Theodore Roosevelt Presidential Library.

Read more

Frequently asked questions

Interactive avatars are digital characters that engage in real-time conversations. They are a natural extension of voice agents. You can add one to your website or use the LemonSlice interactive avatar platform and API to build interactive AI avatars into your products. LemonSlice offers the best interactive avatars in the world, and the only ones that work for both photorealistic and cartoon characters.
All you need is an image. Get started in our playground or build with our API. Your image can be any character in any style, from photorealistic humans to cartoon mascots. You can upload an image, generate one on LemonSlice, or pick one from the library.
Yes. LemonSlice interactive avatars are designed to reply instantly, creating natural, back-and-forth interactions just like a real conversation.
Yes, LemonSlice interactive avatars can speak in any language, allowing you to create engaging experiences for global audiences.
Yes. Our API lets you create a real-time interactive avatar from any LLM or AI voice model, including OpenAI, Claude, ElevenLabs, and Cartesia.
Get started with LemonSlice interactive avatars for as little as $8 per month. For high-volume applications and enterprise support, reach out to our team. Each subscription includes monthly credits, and each minute of a call uses credits from your total. Turn on overage in billing to enable usage beyond what your plan includes.
We trained our own proprietary video diffusion transformer model so you can turn any character into an interactive avatar. If it has a face, LemonSlice can animate it: photorealistic humans, illustrated characters, stylized designs, cartoons, brand mascots, and more.
If you are a developer, use one of our plugins to integrate LemonSlice into your own agent pipeline. You send us audio, and we stream back video. You can also drop in a hosted widget with two lines of code.
LemonSlice is for software developers and businesses building conversational AI experiences that need a face. If you have a voice agent or chatbot, LemonSlice adds the visual layer that makes interactions feel personal and engaging.
Anywhere you have a chatbot or voice agent, you can add an interactive avatar. Common use-cases include learning and development, language learning, physical installations, customer support, sales enablement, and entertainment.
Hyper-realistic avatars from a single photo, cartoon and brand mascots, real-time back-and-forth interaction, a developer-friendly API, scalable concurrent sessions, and some of the lowest latency on the market (471ms p99).
Yes. You can chat with several demo interactive avatars on our homepage for free, sign up to make your own custom avatars, or try the API and give your AI agents a face. You can also request a demo.

Ready to build with interactive avatars?

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