Desktop app for macOS and Windows
A drafting studio for Philippine architects. Draw a real floor plan in minutes, watch it stand up in 3D as you draw, and ask for revisions you approve before anything changes. Files stay on your machine.
Free while in development. No public release published yet. Mac with an Intel chip? Get the Intel build.
Your download has started
The Mac app is signed and notarized by Apple.
The Windows installer is not code signed yet, which is why Windows asks once before running it.
Pick the wall tool, click a start point, then type 4000 and press Enter. The wall is exactly four metres. No dragging until it looks right, no cleanup pass later.
Close a loop and the room inside names itself and measures itself. Move any wall afterwards and the area follows, along with every dimension that was snapped to it.
Plan 1:100 · millimetres · +x east
There is no export step and no second model to keep in sync. The 3D view is the plan, read the other way. Draw a wall and it is already there, three metres tall, with the light falling on it.
Materials and furniture come from a built-in library of CC0 assets from Poly Haven, Kenney and ambientCG. Lift the roof, cut the model at eye level, stack another floor on top, or press Shift+W and walk through the rooms at eye height, up the stairs and out the door.
Cold and hot water, drainage, vent and storm, electrical conduit, aircon line sets and condensate drains draw like walls, at a height you type, each on its own layer. Place lights, outlets, switches and aircon units, then link each switch to the lights it controls. Walk through in X-ray and the runs are there, inside the walls.
The review list reads the model as you work: a pipe through a column or across a door, a drain that falls too little, a light no switch controls. Each item says where and why in plain words. Set one aside with a note; nothing is ever marked approved.
Pick the city and the sun stands where it will over that lot, on that date. Scrub the hour with U and I, or step through morning, noon, afternoon, dusk and night. After sunset the fixtures you placed light their rooms, and a saved view keeps its hour.
When a view is right, Render makes a path traced still of it, from HD to 4K, with bounce light and soft shadows, while the 3D view stays yours to use. The still lands in Visuals, ready for the client or for an AI visualization.
Ask in English or Taglish. The copilot turns the request into the same typed commands the toolbar produces, runs them through the engine, and shows you the result as a ghost on the plan. Nothing is committed until you press Apply, and one undo reverts it.
It answers questions from the model itself, never from a guess. Ask for the floor area and you get the number the engine computed.
Palakihin ang bedroom 300 mm sa east
Proposed change
The app serves an MCP endpoint on localhost while it runs. Add it once and your MCP client can open projects, draw rooms, hang doors, read areas and export a sheet, with the desktop window updating as it works. The model runs inside your client on your own subscription. GUHIT never sees a key and never calls a model.
Every call is translated into the same validated command the toolbar uses, is one undo step in the app, and is refused outright if the plan moved on.
claude mcp add --transport http guhit http://localhost:1450/mcp
Cursor and Codex read the same endpoint.
Share the open project and send the invite. Everyone works on the same plan at once, each pointer in its own color with a name beside it. Press / to say something right where you point, and the Chat panel keeps every message with the project.
The project and its undo history stay on your computer. Guests on your network or VPN connect straight to you, everyone else through a relay in Singapore. The session is encrypted end to end, so the relay cannot read your plan.
A live session on one plan: Ana hosts, Ben and Mika joined with her invite. Point at the plan and press / to join in. Tap Say something to join in.
Open formats first. A project is a folder you can read, and every drawing goes out in something another program already understands. Nothing is locked in a format only this app can open.
Opens
Exports
Lighting, power, plumbing, plumbing isometric and aircon layouts, each with its legend, counts per room and a blank block for the PEE, the Master Plumber or the PME. A PDF can carry a review page too. GUHIT draws the coordination; the licensed professional designs and signs.
A project is a folder on your disk with a readable JSON model, snapshots, renders and underlays. There is no account, no sync and no server holding your drawings. A live session sends the plan only to the people you invite, encrypted end to end.
If you use the in-app copilot, the Claude API key is stored in a private file on your computer and is never handed to the interface. Through MCP there is no key at all: your own client does the thinking.
The language model cannot touch geometry. It emits typed commands that the Rust engine validates and can refuse, with a plain reason. A door that does not fit its wall is not drawn, it is rejected.
The MCP server binds 127.0.0.1 and refuses any request whose Host header is not local, so a web page cannot reach it. Exports can only be written inside the app's own exports folder.
The macOS app is signed with a Developer ID and notarized by Apple, so it opens like any other Mac app. Every update is signed as well, and an installed copy refuses one that does not match its key.
Most drafting software asks a Filipino architect to undo its defaults before the first wall goes down. This one starts where local residential practice starts.
1 plan · 2 split · 3 three-d · F fit · Z zoom to selection · Shift+W walk · U and I move the sun · Mod+K command palette · ? for the full sheet
Mac with an Intel chip? Get the Intel build.
Your download has started
The Mac app is signed and notarized by Apple.
The Windows installer is not code signed yet, which is why Windows asks once before running it.
On a Mac
On Windows
The Mac app is signed and notarized by Apple. The Windows installer is not code signed yet, which is why Windows asks once. Most Macs from late 2020 on have Apple silicon and use the main macOS button; older Macs with an Intel chip use the Intel build.