Four free tools, no signup.
Each one runs on the same thinking the Engine runs on: lead time as a path, stock as coverage, decisions with dates on them. Use them on your own numbers, keep whatever they produce, and if the outputs worry you, that is exactly what the Fit Call is for.
Pick by the question in front of you.
Supply chain map builder
Drag your suppliers, freight legs, warehouses and channels onto a canvas, connect them, and the critical path computes as you build. Exports as a PNG you can put in front of a team or a forwarder. The fastest way to see your real lead time as a path instead of a guess.
Free inventory dashboard
Upload a Seller Central CSV and get the core read on every SKU: velocity, days of supply, reorder timing, overstock flags. No API connection, no account, and the file never leaves your browser.
Supply chain health score
A short diagnostic on how your planning actually runs: visibility, stockout exposure, cash discipline, process maturity. It will also tell you if you are too small for a managed layer, which is a real answer this site gives on purpose.
Stockout cost calculator
Four sliders on your last dark stretch: margin gone while dark, the recovery tail you bought back, and the date the preventing decision was actually due. Your inputs, your arithmetic, nothing asserted about your business.
All four are free because they are the parts of the method that work without us: seeing the path, reading the file, scoring the process, pricing the failure. The part that needs people is keeping it all true every week.
If you are weighing vendors, not tools.
The compare section maps the whole landscape by the question each shelf answers: planning software, management systems, seller suites, profit analytics, agencies, enterprise platforms, and where the weekly decision actually lives.
Bring the outputs to a call.
A drawn chain, a dashboard export, a health score, a stockout bill: any of them is a better starting point than a blank page. Thirty minutes later you know which SKUs are at risk in the next 90 days.