16SPANAI build planner
Pricing

Pay for what you draw.

Every tab is open to everyone: the blueprint, the 3D model, materials, the code check and the build steps. The only thing metered is AI drafting.

Free
$0

About 8 new plans or 35 changes every 30 days

  • Every tab, no locks
  • Unlimited edits by hand
  • Plans save automatically, up to 100
  • Your first plan needs no account
Start a plan
Pro · for contractors
$49.99/ month

About 71 new plans or 310 changes every 30 days

  • Everything in Free
  • The best price per plan, for many projects a month
  • 50% more from every credit pack: $25 buys about 35 new plans, not 23
  • Cancel anytime from the account menu
AI credits · top up
from$5

One-time. Never expire. Used once your allowance runs out. Pro members get 50% more.

$5about 4 new plans or 20 changes
$10about 9 new plans or 40 changes
$25about 23 new plans or 100 changes
Sign up to buy credits

Uses your AI allowance

  • Drafting a new plan from your description or sketch, with its local code and store prices
  • Asking the AI for a change, a re-check or new prices
  • Asking the AI a question about your plan

Always free

  • Editing the drawing by hand: drag, resize, add and remove members
  • Span checks on your edits, run in your browser
  • The 3D model, materials list, code check and build steps
  • Downloading the plan file and the blueprint sheet
How the numbers work

Usage, not seats.

Projects vary, so 16Span meters the AI work each one takes instead of charging per project. A new plan uses the most; a change to a plan you already have uses about a quarter of that, and a quick question less still.

Counts are estimates
A new plan includes looking up your local code and store prices. The counts are for a typical deck: bigger or more complex projects use more.
A rolling 30-day window
Your allowance doesn't reset on a fixed date: each day's usage frees up 30 days later.
Allowance first, then credits
Credits only pay once your monthly allowance is used, so they last until you need them.
Always in view
The ring beside your account fills as you use your allowance. Hover or tap it for the numbers.

Start free.
Top up when you need to.

Start a planRead the FAQ