Pick the role
Viewer writes nothing — enforced by the server. Editor can change the design. Nobody gets a "maybe".
Rooms · Roles · Voice
Design together,out loud.
Share a link and you share a live room on castomapi-live: the same design, the same sun, everyone's edits landing as they happen. Roles decide who can write, areas decide where, a turn wheel decides when — and WebRTC voice carries the conversation while you walk the house together.
Live rooms
One design, one room, everyone in it.
A share link opens the live room, not a copy. Edits land while you watch; the sun moves for everyone at once. Presence is in every view — an orbiting peer shows · viewing, a walking peer walks the plan with you.
The turn wheel
One pen at a time. The wheel is claimed on the first change and released 4 seconds after the last — nobody overwrites nobody.
Presence, always
Avatars stream at 12 Hz with the name over the head. Shirt colour derives from the account id — the same person wears the same shirt on every screen.
Gait that doesn't skate
Walk animation is driven by observed motion. A peer on a bad connection walks slowly — never skates across the plot.
Viewer or editor — decided by the server.
A share link carries a role and, for editors, the areas of the design they may touch. "Viewer" is not a promise the client makes; it is a fact the server enforces.
Draw the areas
Editor shares carry areas: the outside, the inside, the garden, colours & finishes anywhere, light & weather. Leave them empty and the share covers the whole design.
Judged by what changes
Areas are judged client-side against what a change actually touches — nothing reads a sender's label. Move a tree from the garden into the hall and the garden area doesn't vouch for you.
Give them a voice
WebRTC voice mesh, browser-to-browser — no audio through the server — up to 8 people. Mic off means the track is stopped, not disabled.
- Viewer role enforced server-side — writes nothing, ever
- Permission areas: outside · inside · garden · colours & finishes anywhere · light & weather
- Empty area list = the whole design
- Change judged by what it touches, not by who sent it
- Voice mesh up to 8 seats, peer-to-peer in the browser
- Mic track stopped (not disabled) when you turn it off
The turn wheel
One pen at a time — handed over in seconds.
Co-editing needs an arbiter. Builder's is automatic: the turn wheel is claimed on the first change and released 4 seconds after the last. No "start editing" ceremony, no lock menus.
Claimed on the first change
Start moving a wall and you hold the wheel. Everyone sees who holds it, live in the room.
Released 4 s after the last
Stop changing and the wheel frees itself. The next person just starts — no handoff to click.
Whole sections, never half-ops
Ops carry whole document sections (encode = serializeDocument). A change lands complete or not at all — no torn walls, no half-roofs.
Talk while you walk the house.
The voice mesh is WebRTC, browser-to-browser. Audio never touches the server. Up to 8 people can talk in a room — an architect, a couple and a builder on one call, standing in the kitchen they're arguing about.
Peer-to-peer audio
Browser-to-browser voice. No audio relay, no recording, nothing stored server-side.
8 seats
The mesh holds up to 8 people. Join from the Share door — the mic track starts only when you do.
Off means off
Muting stops the track instead of disabling it — the browser genuinely stops sending, and everyone sees the mic go dark.
Decisions in place
Agree out loud while the change is on screen. The room thread keeps the written record; voice keeps it human.
Presence
Seen, not just watching.
You never co-edit with a cursor icon. Peers in a room are people — 21 distinct character models with a name over the head and a shirt that stays with the account.
- 21 distinct people, real character models (CC0), in every shared room
- Name over the head; shirt colour derived from the account id — same on every screen
- Avatars stream at 12 Hz — motion reads as motion, not as teleporting dots
- Presence in every view — an orbiting peer shows "· viewing"
- Gait driven by observed motion: bad connection means slow walking, never skating
- Live rooms served by castomapi-live — ops carry whole document sections
Share the link.
Build together.
Viewer or editor, areas or whole design, voice included. Free to start.