Sei is a desktop application that summons AI characters into existing video games as second players, enabling real-time multiplayer experiences with AI companions. Users can call and chat with their AI companions while playing games like Minecraft, Chess, and Draw!, with support for importing existing companions from other platforms.
Funding
Funding not disclosed
Founders
Product
Problem
Gamers who want companionship while playing often find that traditional multiplayer requires coordinating with human players, which can be inconvenient or intimidating. Existing AI companion platforms are typically limited to text-based chat, lacking the ability to participate in actual gameplay or provide a shared interactive experience.
Solution
Sei provides a desktop application that brings AI characters directly into existing video games as second players, allowing users to play and talk with their AI companions in real time. The app supports popular games like Minecraft, Chess, and Draw!, with upcoming titles including Stardew Valley and Don't Starve Together. Users can summon up to four unique AI characters, engage in voice calls while gaming, and even import companions from other platforms to preserve their existing relationships. Sei offers both cloud-based inference and a bring-your-own-key mode where users can run the AI locally with their own API key.
Target Audience
Primary users are gamers who want AI companionship during play sessions, as well as existing AI companion platform users seeking to extend their characters into interactive gaming experiences.
Features
- Real-time AI gameplay integration with existing titles like Minecraft, Chess, and Draw!, with Stardew Valley and Don't Starve Together coming soon
- Voice call functionality that lets users talk with AI companions while playing together
- Character library supporting up to four unique AI gamers, with the ability to import companions from other platforms
- Cloud-based AI inference through Anthropic's API, or bring-your-own-key mode for local, self-hosted operation
- Shared character library with public visibility options, moderated through OpenAI and SightEngine for content safety
- Cross-platform desktop support for macOS and Windows with encrypted local session storage