EstimatingOSFor owner and contractor estimators
Great estimators deserve a better system.
Good estimates come from experienced people, not software. But most estimating teams are stuck working out of spreadsheets, old files, and memory. EstimatingOS gives your estimators one structured way to build bottom-up estimates. AI handles the busywork. Your people make the calls.
01The problem
Estimating is high stakes work running on loose parts.
Every estimate has gaps. The trouble is not knowing where they are until someone asks.
Every estimate starts from a copy.
Teams grab the last similar job and edit it. Old assumptions ride along, and nobody is sure which ones.
The basis lives in people's heads.
Why a rate was chosen or why an allowance exists is rarely written down. When someone leaves, the reasoning leaves too.
Coding eats the schedule.
Mapping thousands of takeoff lines to WBS and CBS by hand is slow, and two estimators will code the same item two ways.
EstimatingOS tracks every estimate item as confirmed, unconfirmed, or a plug. You see what's at risk before it goes out the door, not after.
Example counts from a working Class 3 estimate.
02How it works
From takeoff to a defensible estimate.
EstimatingOS follows the AACE breakdown of directs, indirects, and overheads, so the structure is right before the first number goes in.
- Step 1
Bring your takeoff
Import quantities from the takeoff tools you already use. We don't replace them.
- Step 2
AI structures it
Every line is mapped and coded to your WBS and CBS, using your own master data.
- Step 3
Build bottom up
Labor, materials, equipment, and subcontracts, at the detail a Class 3 or Class 2 estimate needs.
- Step 4
Own the numbers
Estimators review, set rates, and sign off. The basis is captured as you go, not written after.
03The rule
AI structures.
Estimators decide.
The AI in EstimatingOS never makes up a quantity or a rate. It does the work that slows estimators down: mapping, coding, organizing, and flagging what's missing. Judgment stays with the people accountable for the number.
04Who it's for
Built for process industry estimating.
Owner estimators
Build and check estimates for funding decisions, and hold contractors to a consistent basis.
Contractor estimators
Turn bid packages into structured estimates faster, without losing the detail behind the price.
Refining, chemicals, energy
Anchored to AACE 18R-97 for the process industries.
Directs, indirects, overheads
Labor, materials, equipment, and subcontracts, broken down the AACE way.
Connected to execution
Powered by Optimality, so the estimate links to the plan that delivers it.
05Who's building it
Built by an estimator who builds software.
Woman-owned and operatedCali Collins has 15 years of estimating experience and 15 years of product management experience at companies including ExxonMobil and Meta.
Yes, those overlap. She's spent her career on both sides of the screen: building estimates, and building the software people use to run their work. She's also co-founder and CPO of Optimality, the Execution Intelligence platform EstimatingOS is built on.
06Early access
We're working with a small group of estimating teams first.
If your department builds Class 3 or Class 2 estimates and you want a say in how this works, send a note. Tell us your role and the kind of projects you estimate.