Try the Web App
Change the carton size or quantity in the panel below. Open the web app full-screen when you need more room for the 3D view.
The classic version runs entirely in your browser—it keeps working even when the online service is busy or you're offline.
Use T1 in Your AI Assistant
T1 is also an MCP server: add it to an MCP-capable assistant (Claude, ChatGPT, Cherry Studio, and more) and ask in plain language—“how many 600×400×350 boxes fit in a 40HQ?” The count, fill rate, and a 3D loading image come back in the chat. Free, no sign-up, no API key.
https://mcp.zhihuo.net/mcp (Streamable HTTP) — what is MCP?
Setup and example questions
- In Claude (Desktop or claude.ai): Settings → Connectors → Add custom connector → paste the address above.
- In Cherry Studio: Settings → MCP Servers → Add → choose “Streamable HTTP” → paste the address → enable.
- “How many 600×400×350 cartons fit in a 40HQ container?” — presets include 20/40/45 GP·HQ, 53HC/48HC, reefers, and EU pallet-wide; the 3D view shows the exact interior dimensions used.
- “How many 600×400×350 boxes fit in a 2000×1000×1000 space?” — any rectangular space: a pallet area, leftover container space, or a larger box.
- “Load 120 cartons toward the front of a 40-ft container and show the plan.”
T1 WebAPI for Developers
For direct integration, send one carton size plus a container preset or explicit space dimensions to POST https://mcp.zhihuo.net/api/t1/pack. The response returns the count, fill rate, placed loading regions, and a shareable 3D image URL. Free, no sign-up, no API key.
Published T1 Benchmark
A fixed 10,000-case single-SKU 40HQ benchmark: full CSV corpus, generator, and dated spot checks against public loading tools. In the June 2026 refresh, T1 depth 3 won 7,873 of 10,000 cases against a transparent six-orientation baseline, tied the rest, lost none—2.656% more cartons on average.
Desktop apps 0.1.2
Pack offline on Windows 10/11, Apple silicon Mac running macOS 12 or later, or 64-bit Ubuntu 24.04 LTS or later. Windows 7 users can use the compatibility edition.
Windows 10/11 (64-bit): The current installer is unsigned; if Microsoft Defender SmartScreen appears, choose More info, then Run anyway.
Windows 7 (32-bit or 64-bit): Download the compatibility ZIP, unzip it, then run SmartPacker.exe. This edition is unsigned.
Mac: macOS 12 or later on Apple silicon, notarized; delivered as a ZIP — unzip to get the DMG.
Linux: Ubuntu 24.04 LTS or later, 64-bit; delivered as a ZIP. Unzip it, then run chmod +x SmartPackerT1-0.1.2.AppImage before first launch.
File sizes and SHA-256
SmartPackerT1-0.1.2-Setup.exe— 100,675,060 bytes; SHA-2564c3f00abcb053469e8e4583417c3013f.232cbbc1d08360e18f48b563ce77ae3d SmartPackerSingleCartonT1Fmx.zip— 3,716,848 bytes; SHA-2564ebb3262f2fc0beca69ac4d21972342a.b6ed39778026bda403dfe5d3dd8d2df2 SmartPackerT1-0.1.2-arm64-macos12.dmg.zip— 113,766,022 bytes; SHA-25632a572a8eba6bc520e1e3c45c12f882c(contains the notarized DMG, SHA-256f0d69ad1714c2e13e117a3e7498e2f76 6ff92277fd46c5a9f90e7765e4d4499a).d463560eadc8844f7ed9ea077cfbac53 SmartPackerT1-0.1.2.AppImage.zip— 119,614,851 bytes; SHA-25684679906055012dcc5d8a7fcbad765cc(contains the AppImage, SHA-256d663989a62dd95c66bcc32e6dd87275b aafa3dcd7837810be9477fb033dfad59).4939c5cf34ceee19cf313174e1b51d2d
Command line
A Windows command-line copy of the same loading calculation, for checking the published benchmark numbers on your own PC.
What T1 Helps Answer
SmartPacker Single Carton plans how one type of carton fits into a single loading space. That space can be the full or remaining interior of a container, the area above a pallet, or a larger box that holds smaller cartons.
Enter the length, width, and height of the loading space and the carton. T1 calculates a plan for the maximum quantity and shows it in a 3D viewer.
Full Container Load
Find the maximum carton count for a known container space.
LCL or Fixed Quantity
Set a fixed carton count and find the minimum height, width, or length needed.
Package Design
Test carton-size tolerances or deformation allowances before locking in a packaging design.
3D Viewer
The loading plan is broken into groups, listed alongside the view. Use the checkboxes to show or hide each group, drag to rotate the view for a full 360° look, and use the mouse wheel to zoom.
A green triangle marks the front face of each carton; a white triangle marks the side face. Together they let you read the orientation of every loaded group.
What-if Controls
Spin the mouse wheel over a number field to nudge it up or down. This makes it quick to test how the loading space or carton size changes the result—useful for checking clearance, tolerance, or alternative package designs.
Fixed Quantity and LCL Planning
When the carton quantity is fixed, such as in an LCL shipment, enter the quantity and choose whether to load for minimum height, width, or length.
You can also vary the carton quantity to see how the loading pattern evolves, then settle on a practical shipment size.
Questions and comments: zhzx@zhihuo.com.
Other Editions
Use T1 for a single carton type. Switch to another edition when the shipment contains multiple SKUs.