12 Sierras Woodworking, home

The app

12 Sierras, an iPhone app for woodworkers

A furniture estimator for one-person woodworking shops. Start from the overall size of a piece and get every part. The app lays them out on the boards you already own, tells you exactly what lumber you still need to buy to finish the project, and checks the plan against the machines you have.

Download on the App Store

$24.99 early-bird price. iPhone only.
No account, no ads, no tracking.

Looking to buy a piece of furniture instead? Commission one from me.

The projects screen, listing saved furniture projects
Your projects, kept on your iPhone.
A cut list for a walnut dresser, with walnut, poplar and plywood priced separately
A walnut dresser: walnut, poplar and plywood priced separately.
The cut list laid out on the boards in the user's rack
The cut list laid out on the boards in your rack.
The lumber order screen with large numbers
What you still need to buy, in big numbers for the yard counter.
Shop checks, with a queen bed failing a 32-inch door check in red
A queen bed that won't fit through a 32" door.
The six furniture forms to start from
Six furniture forms to start from.

Why I built it

Know what you own. Know what a project takes. Know what's missing.

I built 12 Sierras for my own shop. Most cut-list tools start from a parts list you already have. This one starts a step earlier, from the overall size of the piece, then packs the parts onto the boards on your rack, turns whatever the rack can't cover into a buy list, and checks the plan against your machines.

  • Know what a project takes

    Pick a form (dining table, bed, side table, bookcase, cabinet or dresser), enter rough dimensions, and get the cut list. Every part shows the arithmetic it came from, what it's made of, and whether it's a glue-up.

  • Joinery as an allowance

    Say how much length your joints add, whether tenons or dados, or cut to the shoulder for Dominoes, biscuits, dowels and pocket screws.

  • Priced the way you buy

    Show wood, hidden wood and sheet goods are priced separately, and lumber is charged by the quarter (4/4, 8/4…) at nominal thickness, with your waste factor.

  • Know what you own

    Keep your board rack in the app. It lays the cut list out on your real boards and splits wide parts into glue-up strips your jointer can actually flatten. After the build, one tap updates the rack with what you used and the offcuts you kept.

  • Know what's missing

    Whatever the rack can't cover becomes a buy list with thickness, width, minimum length and board feet, shown in big numbers for the lumber-yard counter.

  • Checked against your shop

    Enter your jointer, planer, saws, clamps and door width. Every plan is checked for planer capacity, rip and crosscut limits, clamp count, and whether the finished piece fits through the door.

  • Built for the shop floor

    Works offline. Imperial fractions to 1/16", or metric, with fraction keys above the number pad. Share, copy or print any cut list, and back everything up to a file.

  • Optional AI drafting

    For pieces the templates don't cover, connect your own Anthropic, OpenAI or Google account and describe what you're building. Drafted parts are checked against your dimensions and clearly marked. Nothing else in the app needs it.

Get 12 Sierras

$24.99 early-bird price. iPhone only. Everything included: no subscription and no in-app purchases.

Download on the App Store

Estimates come from the dimensions you enter. Check every cut list against your own drawing and stock before cutting.