Software that pays for itself in time and space saved.
Two tools, one workspace: Carton Fit for packing products into cartons, and Freight for stuffing containers. Pick the plan for what you ship — or Pro Plus for both.
Try both Carton Fit and Freight on a real job — no card.
- 7 calculations total — one-time, shared across both
- Carton Fit + Freight, both included
- Interactive 3D + 2D plans
- Exports — web view only (watermarked)
Both tools for occasional planning, at an entry price.
- Carton Fit AND container stuffing
- 50 calculations per month
- Custom boxes & sizes
- Clean, un-watermarked image exports
- No saved load plans or history
- No custom vessels or AI import
For retailers, distributors, 3PLs & brands packing cartons.
- Carton Fit — units per box & boxes needed
- Unlimited carton calculations
- Saved box library (cartons & crates)
- Reusable item library
- PDF reports, CSV export & clean images
- No container stuffing (freight)
For teams planning container & trailer loads weekly.
- Container stuffing — all 50+ vessel types
- Unlimited load calculations
- Crate, pallet, trolley & mixed modes
- Custom vessel library
- PDF reports, CSV export & clean images
- No Carton Fit
Everything — Carton Fit and Freight together.
- Everything in Carton Pro + Freight Pro:
- Unlimited calculations, both kinds
- Saved box + vessel libraries
- Export Documents — invoices & packing lists for 9 jurisdictions (new!)
- Lane calendar, webhooks & embeddable widget
- Clean exports + priority support
For higher AI volume and organization rollouts.
- Everything in Pro Plus, plus:
- White-label PDF & image exports
- Enterprise SSO (on request)
- Unlimited API access for integrations
- Onboarding & dedicated support
Buy any plan for your whole team
Working as a team? Purchase any paid plan for your organization and choose how many seats you need — you're billed the plan's price for each seat. Everyone you assign to a seat gets that plan inside one shared workspace, with saved plans, libraries and branding in common. Add or remove seats anytime and we prorate the difference.
Start a team workspaceEvery feature, side by side
| Free Trial | Starter | Carton Pro | Freight Pro | Pro Plus | Custom | |
|---|---|---|---|---|---|---|
| What you can plan | ||||||
| Carton Fit — products into cartons & crates | ||||||
| Container stuffing — cargo into vessels | ||||||
| Calculations | 7 total | 50 / month | Unlimited | Unlimited | Unlimited | Unlimited |
| Carton Fit (product packing) | ||||||
| Units per box & boxes needed | ||||||
| Optional per-box weight cap | ||||||
| Saved box library (cartons & crates) | ||||||
| Saved item library (products) | ||||||
| Container stuffing (freight) | ||||||
| Vessel, trailer & rail types | All 50+ | All 50+ | All 50+ & custom | All 50+ & custom | All 50+ & custom | |
| Custom vessels & containers | ||||||
| Multi-container splitting | ||||||
| Pipe telescopic nesting | ||||||
| Crate, pallet, trolley & mixed modes | ||||||
| Saved item library (cargo presets) | ||||||
| Custom crate, pallet & trolley library | ||||||
| Visualization & analysis | ||||||
| Interactive 3D + 2D views | ||||||
| Weight distribution & center of gravity | ||||||
| Printable loading chart & instructions | ||||||
| Saved load plans & history | ||||||
| AI | ||||||
| AI manifest import (paste & parse) | ||||||
| Spreadsheet / CSV manifest import | ||||||
| Free AI tokens / mo (copilot; import on Pro tiers) | 30K | 120K | 300K | 300K | 600K | 5M |
| Top up with prepaid credit packs | ||||||
| Exports | ||||||
| CSV data export | Web view only | Web view only | ||||
| PDF reports (detailed + summary) | Web view only | Web view only | Clean | Clean | Clean | Clean |
| 3D image export (PNG / JPG) | Web view only | Clean | Clean | Clean | Clean | Clean |
| Custom branding (your logo on exports) | ||||||
| White-label (remove ContainerMath branding) | ||||||
| Export Documents | ||||||
| Commercial Invoice, Packing List & more — 9 jurisdictionsNew | ||||||
| Automation & integrations | ||||||
| Auto-Pack Optimizer (cheapest equipment) | 5 runs/mo | 100 runs/mo | ||||
| Lane scheduling calendar | ||||||
| ERP / TMS webhooks | ||||||
| Embeddable calculator widget | ||||||
| Team & support | ||||||
| Per-seat team plans & shared workspace | ||||||
| Enterprise SSO | On request | |||||
| API access | 1,000 / month | 2,000 / month | Unlimited | |||
| Support | Community | Priority email | Dedicated + onboarding | |||
“Unlimited” plans are subject to a fair-use cap of 500 calculations per month to prevent automated abuse; the Custom plan is exempt. See the FAQ below for details.
REST API access requires a company account: API keys can only be created and used from a work email address. Accounts registered on personal or free-mail addresses (Gmail, Outlook, Yahoo and similar) can use every other feature of their plan, but not the API.
Questions, answered
What's included in the Starter plan?
Starter is the entry plan at $19.90/mo. It unlocks BOTH tools — Carton Fit and Freight — with 50 calculations per month and clean, un-watermarked image exports. You can create your own custom boxes and sizes. It does not include PDF report or CSV downloads, saved load plans/history, custom vessels, or AI manifest import — step up to a Pro plan for those.
What's the difference between Carton Pro and Freight Pro?
Carton Pro is for product packing — how many of your products fit inside a carton or crate, and how many boxes an order needs. It suits brands, retailers, distributors, 3PLs and manufacturers alike. Freight Pro is for container stuffing: loading cargo into shipping containers, trailers and rail. Each plan includes only its own tool — choose Pro Plus to get both.
Does Freight Pro include Carton Fit?
No. Freight Pro covers container stuffing only. Carton Fit is on Carton Pro and Pro Plus. If you need both, Pro Plus bundles them.
What counts as a calculation on the free trial?
Each distinct job (your box/container + items) you run. The free trial includes 7 in total — a one-time allowance shared across Carton Fit and Freight, not a monthly quota. Re-running the same job in a different mode, or saving it, doesn't use another — only a new or edited list does.
How does annual billing work?
Carton Pro, Freight Pro and Pro Plus are about 33% cheaper billed annually (Starter is monthly-only). Carton Pro is $50/mo ($402/yr), Freight Pro $99/mo ($795/yr), and Pro Plus $129/mo ($1,037/yr). Use the Monthly / Annual toggle above.
How does AI usage and pricing work?
AI manifest import (paste a dispatch/packing list and let AI structure it) and the Stowy copilot draw from ONE shared balance of prepaid tokens. Each plan includes a monthly free-token grant that resets at the start of each month — Free 30K, Starter 120K, Carton Pro & Freight Pro 300K, Pro Plus 600K, Custom 5M. You're billed by the actual tokens used, not a flat per-run fee, so a typical parse costs very little. AI manifest import itself is a paid capability (Carton Pro, Freight Pro, Pro Plus and Custom); the free trial and Starter get free tokens for the copilot. Running low? Top up anytime with prepaid credit packs that never expire.
Are “unlimited” calculations really unlimited?
For everyday interactive planning, yes. To protect the service from automated or abusive use, the Carton Pro, Freight Pro and Pro Plus plans carry a fair-use ceiling of 500 calculations per month — well above what hands-on planning reaches — which resets each month. A calculation is one distinct packing run; re-running or re-saving the same job doesn't count again. If your legitimate workload regularly needs more, the Custom plan lifts the fair-use cap entirely.
Can I buy ContainerMath for my whole team?
Yes. Any paid plan can be purchased for your organization on a per-seat basis — you pay the plan's price for each seat. Create an organization, choose your seat count at checkout, then assign teammates to seats; each one gets the plan inside your shared workspace. You can change the number of seats anytime, and we prorate the difference.
ContainerMathThe industry standard for 3D container cargo packing and loading plans. Optimize layouts, maximize volume, and reduce shipping overhead.
Built by Backrock Studios