Tell Holo what you'd like to build, watch it rise block by block, then walk through it or export it.
The block twin of HoloBricks.
 Hogsmeade Under the Snow |
 The Sun King's Garden |
 Crystal Palace Park |
 Kratos |
| Describe | Type an idea or drop in a photo, and Holo builds it in 3D while you watch. |
| Trust | Every block comes from a ~750-block palette, on a 128×128 site. |
| Replay | Scrub back through the steps, read each step's code, or share the build as a GIF. |
| Tweak | Move, replace and place blocks, or walk through the build. |
| Export | Download a WorldEdit .schem and paste it into your world. |
| Share | Publish a build so anyone can open it, and fork it into their own once signed in. |
you ── idea ──▶ Holo (H Agents API) ── blocks run ──▶ Workstation
▲ │ │
└── 3D model ◀────┴─────────────── model.json.gz ◀──────────┘
Your browser renders every revision and shows it to Holo, so keep the tab open while it builds.
Every build above was made by Holo from a sentence. Live at blocks.hcompany.ai: browse the public builds without an account, sign in with Google or an email to build.
You need Node 20+, uv and an H account from platform.hcompany.ai: signing in mints the Agents API key Holo builds with.
git clone https://github.com/hcompai/holoblocks && cd holoblocks
cd server && uv sync && cd ..
server/.venv/bin/python scripts/pack-toolkit.py # the toolkit Holo installs on its Workstation
server/.venv/bin/blockyard-gallery web/public # the showcases
cd web && npm install
echo "BLOCKYARD_SECRET=$(openssl rand -hex 32)" > .env.local # signs the sign-in pass
npm run devOpen http://127.0.0.1:5173 (not localhost) and sign in. Publishing needs
BLOB_READ_WRITE_TOKEN from a public Vercel Blob store; private builds, forks
and renames need BLOCKYARD_PRIVATE_BLOB_READ_WRITE_TOKEN from a separate private one. To try the blocks CLI by
hand, sh setup.sh <build dir> puts it on your PATH (it may ask for sudo) and links the showcases into that folder.