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.

Open Full-Screen

Use T1 in Your AI Assistant

SmartPacker's single-carton engine is now an MCP server—a new way to use T1 without opening the app. Add it to any MCP-capable AI assistant (Claude, ChatGPT, Cherry Studio, and more) and ask in plain language, e.g. “how many 600×400×350 boxes fit in a 40-ft container?” You get the maximum count, the fill rate, and a 3D loading image right in the chat. Free, no sign-up, no API key.

Add this MCP server (Streamable HTTP) in your assistant's connector / MCP settings:
https://mcp.zhihuo.net/mcp

New to this? Add it in a couple of clicks:

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.

Three ways to ask (each returns the count, fill rate, and a 3D loading image):

Carton size + a container — “How many 600×400×350 cartons fit in a 40HQ container?” Name a standard container instead of typing dimensions: 20/40/45 GP·HQ, 53HC/48HC, reefers (20RF/40RF/40RH), and EU pallet-wide. (Interior dims are nominal—the 3D view shows the exact ones, so you can re-ask with your own L×W×H if your container differs.)
Carton + space dimensions — “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).
A set quantity, loaded to one side — “Load 120 cartons toward the front of a 40-ft container and show the plan.”

What is MCP?

Published T1 Benchmark

We publish a deterministic 10,000-case single-SKU 40HQ benchmark with the full CSV corpus, generator, and summary, plus dated public-app spot checks for Pier2Pier, SeaRates, CargoesPi, EasyCargo, Goodloading, and CargoLoader3D. In the June 19, 2026 run, T1 depth 3 beat a transparent one-cut heuristic on 7,961 cases, tied 2,039, lost 0, and averaged 2.633% more cartons. Public MCP remains depth 2 for live-layout reliability; depth 3 will be released in the desktop app and local CLI for self-run verification.

Read Benchmark Download CSV

Download SmartPacker T1

For offline use, download a desktop ZIP package, unzip it, and run the app—no installer required. Keep both builds on hand: older customer PCs may run one more reliably than the other.

Desktop Build 1 ZIP Desktop Build 2 ZIP

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 used to hold smaller ones.

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.

Demo 1: input dimensions and calculate a loading plan

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.

Demo 2: show or hide groups and inspect carton orientation

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.

Demo 3: reduce space height and see the loading pattern adapt

Demo 4: adjust carton size to check fitting tolerance

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.

Demo 5: fixed quantity with minimum-space planning

You can also vary the carton quantity to see how the loading pattern evolves, then settle on a practical shipment size.

Demo 6: vary quantity and compare loading patterns

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.

Single SKU

This page. Use it for one carton type and one loading space.

Try T1

Multi-SKU, Rotation Allowed

For mixed cargo that's free to rotate through any of six orientations.

View T3

Multi-SKU, Upright

For mixed cargo that should remain upright during loading.

View U3