Every StackDesign page has a shorter address
Twelve pages carried the word systainer in their file name for no reason other than history. They have proper addresses now, and nothing you bookmarked is broken.
What changed
A page that used to answer at systainer-pricing.html now answers at /pricing. The same goes for /about, /team, /contact, /faq and /free-tools.
The guides moved too. They used to sit under a folder called standalone, which named a site that no longer exists, and they now live at /guides/ like you would expect.
Old links still work
Every retired path redirects to the new one, permanently. A link somebody saved months ago still lands on the right page, and a search result that has not been recrawled yet still works.
The word did not disappear
It is still there where it means something. The dimensions guide keeps it, because that is what the article is about and that is what people type into a search box. What came out is the word in an address that described nothing.
Worth saying plainly: this is housekeeping, not a rename. StackDesign is the same product it was yesterday and the planner is in the same place.
Same tool, shorter path
Open the planner
Pick the boxes you own and get a wall of cabinets sized around them.