# Lemon Slice **Source:** https://geo.sig.ai/brands/lemon-slice **Vertical:** Entertainment **Subcategory:** General **Tier:** Emerging **Website:** lemonslice.com **Last Updated:** 2026-04-14 ## Summary SF YC W24 generative video AI with 1M+ videos and real-time Lemon Slice Live model; $6M seed from Matrix/Chainsmokers/Twitch-founder/Dropbox-co-founder competing with HeyGen and Tavus for expressive talking avatar AI from single photo. ## Company Overview Lemon Slice (formerly Infinity AI) is a San Francisco-based generative video AI platform — backed by Y Combinator (W24) with $6 million in seed funding from Y Combinator, Matrix Partners, The Chainsmokers, Emmett Shear (Twitch founder and CEO), and Arash Ferdowsi (Dropbox co-founder and CTO) — providing content creators and developers with AI models for generating expressive talking characters and realistic human motion and emotion video from a single uploaded photo. Having generated 1 million+ videos on the platform, Lemon Slice introduced Lemon Slice Live — the first real-time audio-video AI model that enables live video chat with any character using AI-generated visual responses, representing a technical advancement from asynchronous video generation to synchronous real-time AI video interaction. Lemon Slice's video foundation model architecture focuses on the specific challenge of generating realistic human motion and emotion: while early AI video generation (Sora, Runway) excels at cinematic scene generation, the precise control of facial expressions, lip synchronization, and body language for talking human characters requires specialized model training on the micro-dynamics of human communication — subtle muscle movements that distinguish genuine emotion from robotic approximation. Lemon Slice's model (trained on human motion and expression data with particular attention to the temporal coherence of emotional transitions) produces talking character videos where the AI-generated avatar's facial expressions and speech patterns match the audio in natural, believable ways. The single-photo input (creating a full talking character from one static image) eliminates the multi-angle video training requirements that most avatar systems need — enabling mass personalization where any portrait can become an AI spokesperson. In 2025, Lemon Slice competes in the AI video generation, talking avatar, and generative video API market with Tavus (AI personalized video, $24.2M raised), HeyGen (AI video generation, $11M raised), and D-ID (talking avatar API, $25M raised) for content creator and developer expressive AI avatar and talking character platform adoption. The Lemon Slice Live real-time capability differentiates the platform from batch-generation competitors — enabling use cases like AI-powered live streaming characters, real-time virtual companions, and interactive AI presenters that asynchronous video APIs cannot support. Emmett Shear and Arash Ferdowsi's angel investments (Twitch founder with live streaming domain expertise, Dropbox co-founder with developer infrastructure background) reflect conviction in the real-time AI video market. The 2025 strategy focuses on growing the developer API ecosystem for real-time AI video integration, building the enterprise avatar deployment for brand spokesperson and customer service automation use cases, and expanding the character customization for IP-licensed entertainment content. ## Frequently Asked Questions ### What is Lemon Slice? Lemon Slice is a generative video AI company building a world-class video foundation model focused on human motion and emotion. The company was formerly known as Infinity AI and is part of Y Combinator's Winter 2024 batch. ### What products and services does Lemon Slice offer? Lemon Slice offers generative video AI technology, including Lemon Slice Live, the first real-time audio-video AI model that enables video chat with any character using just a single photo. They also provide expressive talking characters and a generative video API for developers. ### Who are Lemon Slice's target customers? Lemon Slice targets content creators and developers who need generative video capabilities and real-time character animation solutions. ### When was Lemon Slice founded? Lemon Slice was founded in 2023. ### Where is Lemon Slice located? Lemon Slice is based in San Francisco, California, United States. ### How much funding has Lemon Slice raised and from whom? Lemon Slice raised $6 million in seed funding from top investors including Y Combinator, Matrix Partners, The Chainsmokers, Emmett Shear (Founder/CEO of Twitch), and Arash Ferdowsi (Founder/CTO of Dropbox). ### What key metrics or achievements has Lemon Slice reached? Lemon Slice has achieved over 1 million videos generated on its platform and is growing rapidly. ### What technology does Lemon Slice use? Lemon Slice uses real-time audio-video AI technology to create expressive talking characters from a single photo. Their technology is built on a video foundation model specializing in human motion and emotion. ### How can I get started with Lemon Slice? Content creators and developers can access Lemon Slice's generative video API and platform. Specific contact and onboarding details are not provided in the available information. ### What are the latest developments at Lemon Slice? Lemon Slice recently introduced Lemon Slice Live, the first real-time audio-video AI model for video chat with characters. The company also completed Y Combinator's Winter 2024 batch and secured $6 million in seed funding. ## Tags ai-powered, b2b, b2c, media, saas, startup, gaming --- *Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*