Your ideas. Your AI. Your space.

Describe what you imagine. Watch your room take shape in Sepja.

Sepja + ChatGPT

Sepja is now available in the ChatGPT plugin directory. Connect your account and start designing with a conversation.

Connect in ChatGPT ↗

No ZIP download or manual server setup needed.

From a conversation to a room

1. Open Sepja in ChatGPT and choose Connect.
2. Sign in to Sepja, or create an account. Continue with Google is the quickest way. If you use email, verify your address to continue.
3. Approve the connection, then return to ChatGPT and ask Sepja to create or find a room.
4. Open the room link to explore it in 3D. Keep it open to see your next changes.

Try a first idea

Create a 6 by 5 metre living room with a sage sofa and an oak table.

Then try moving the sofa, changing the floor or adding a window. Your room and its edit history are saved in Sepja.

Have a photo or sketch? Add it to the room’s References panel in Sepja and ask your AI to use it.

Already have a space?

Ask ChatGPT to find your Sepja rooms. You can continue an existing design and ask about changes you made on the canvas.

Manage connected apps · Explore the gallery

Using Claude or another assistant?

Sepja also connects to compatible assistants through MCP. Use the connection guide for your assistant. Read the connection guide