Chuff

Got a box of train track and a patch of floor? Chuff works out what you
can actually build with it.

Tell it what pieces you own and how much space you've got, and it finds
every layout that joins up and fits — plain loops, sidings you can drive
or reverse into, two-way passing loops, and turnaround loops — built only
from track you really have, not some idealised set.

Works with chunky first blocks for toddlers, classic wooden track,
clip-together plastic track, or any other system — just measure a few
pieces once and Chuff remembers the shape of it.

Once you've picked a layout:

• A step-by-step build guide walks you through it piece by piece, with a
live diagram of what's been laid and what's next
• A full-screen mode hands the whole display over to following along on
the floor, and keeps the screen awake while you build
• A "run the train" preview animates the finished circuit before you've
laid a single rail
• Keep your favourite layouts so you can build them again later

No ads, no accounts, and nothing about your track collection or your
floor plan ever leaves your device. If you'd like to say thanks, there's
an optional one-time tip — the app is fully functional without it.