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Sei docs

Short, step-by-step guides for the Sei app. Pick a guide to get started.

Sei is a desktop app for Mac and Windows where you build AI companions and play with them. Each companion has its own personality, voice, look and memory, and you can change all of it. They talk with you on voice calls, watch your screen, and join your games.

You choose where the AI runs: on Sei Cloud, on your own AI account, or fully on your computer. These guides show you how to do all of it, one step at a time.

01 Getting started Download, install on Mac or Windows, sign in, and meet your first companion. 02 Calling your companion Voice calls, the call buttons, interrupting, captions, screen sharing and group calls. 03 Playing games together Minecraft, Stardew Valley, Don't Starve Together, chess, Draw! and Backseat. 04 Companions Add or create companions, and change their persona, voice, skin and look. 05 AI options and local setup Sei Cloud, your ChatGPT plan, your own API key, or fully local with Ollama. 06 Troubleshooting and FAQ Updates, microphone access, Minecraft not connecting, and common questions. 07 Build from source For developers: requirements and steps to run Sei from its source code.

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Start with Getting started. It takes a few minutes and you can use Sei for free, with no card.

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