An estimating desk for millwork shops. You upload the bid package, MillOS reads it, measures it, prices it from your own rates, and hands your estimator a takeoff, a workbook and a proposal to check and sign.

Upload the drawings, spec book and addenda to a Project and start a Chat. MillOS reviews every sheet, reads the specs and notes, and asks you a few quick questions about scope. Then it measures the job, prices each line from your Product Library, and drafts the exclusions, clarifications and RFIs. You get an Excel workbook, a proposal, and a marked-up set of drawings showing exactly what was measured. Today, MillOS is built for anyone who estimates architectural millwork and casework from drawings and specs, from a shop bidding its next job to a team putting together an early budget.

No. It takes the counting, measuring and spec reading off their plate so they can spend their time checking and deciding.

Your estimator still decides what's in and out of scope, makes the grade and value calls, sets the price, and signs off. MillOS can't approve a line, sign a bid or send one. Only a person can, and we built it that way on purpose. What changes is how many quality bids one good estimator can turn out before bid day.

No. ChatGPT gives you its best guess from a picture of the page. MillOS measures the actual drawing at a verified scale, prices from your own rates, and shows you where every number came from.

The difference is in who does what. In MillOS, the AI's job is reading: it works through the drawings and specs and decides what needs to be measured and where. The measuring and pricing are done by regular code, the same way a calculator or spreadsheet works, so a quantity or price can't be made up. When MillOS can't find a clear answer in the documents, it writes an RFI or a stated assumption instead of guessing. It's also more than a chat window: MillOS organizes the bid package for you and has its own drawing viewer and spreadsheet built in, so the drawings, takeoff and workbook all live in one place.

Yes. Today MillOS focuses on one job, turning bid documents into a finished estimate, and doing that job well. It doesn't do shop drawings, CNC, ERP or accounting, and it will never send or sign a bid for you.

Estimating is where shops lose the most time, so that's where we started. MillOS covers the takeoff, estimate, workbook, proposal and RFIs, and it fits around the tools you already use: the marked-up drawings open in Bluebeam or any PDF viewer, and the workbook downloads as a standard Excel file. It doesn't export to CAD or CNC software, read or write Bluebeam markups, or sync with QuickBooks or ERP systems yet.

From the drawing itself. MillOS marks points on the lines the architect drew, and code measures between them at the sheet's verified scale. You can open any line and see exactly what was measured.

MillOS works from the drawing's actual linework, not a picture of the page. Code turns the marked points into quantities: length for runs, area and perimeter for shapes, length times height for wall panels, length times depth for tops, and a simple count for items. Scale is checked against the dimensions printed on the sheet, and any sheet whose scale can't be confirmed is flagged for your review instead of guessed. If a measurement and the sheet's geometry disagree by more than 1 percent, the line is rejected. Anything that isn't measured, like a deducted opening, a set height, or a quantity taken from a schedule or typed by a person, is labelled on the line so you always know what has a drawn trace and what doesn't.

We don't publish an accuracy percentage, and we wouldn't trust one from anybody else. The fair test is your own: run a job you already bid and compare.

There's no independent benchmark for AI millwork takeoff yet, and a number from our own testing wouldn't mean much to you. AI can be wrong. It can miss scope, misread a sheet, or measure something incorrectly, and our Terms say so plainly. What we can promise is that every line shows how it was made, so mistakes are easy to spot before you sign. The best way to judge MillOS is a bid you've already sent, where your own estimate is the answer key.

Yes. The spec book goes into the same estimate as the drawings, and every line cites the section or note it relied on.

Before any measuring starts, MillOS builds an index of the whole package: legends, keynotes, general notes, schedules, spec sections and addenda, each tied to its page. It reads grade, certifications, hardware, alternates and allowances from the specs and Division 01. If no AWI grade is named, it assumes Custom, and a Premium item in a Custom job gets its own line. If the specs require a certification your shop doesn't hold, like AWI QCP, MillOS flags it right away so you can decide whether to bid. When addenda revise a sheet, the new sheet replaces the old one.

Yes. Every item ends up as a priced line, a sourced exclusion, a clarification or a question, all drafted for your estimator to edit and send.

Exclusions point to the note or spec section that assigns the work to someone else, like NIC or by owner. Items without a quantity, such as shop drawings, samples, field measuring, delivery and installation, become a line, a clarification or an adder based on your pricing rules. Alternates are priced separately and never folded into the base bid. If your shop prefers a different product, MillOS offers it as a voluntary alternate next to the specified item, never as a swap. Minor questions become an RFI while MillOS keeps working on its best reading. If a question truly blocks the estimate, it stops and asks you.

From your Product Library and pricing rules, calculated by code. The AI never invents a price. If an item isn't in your library, the line stays unpriced and flagged, or gets a clearly labelled allowance if your rules allow it.

Each priced line is matched to one product in your library, and MillOS shows why it made that match so you can check it. Your pricing rules handle adders, tax, minimums, installation rates and qualifications, and every dollar figure on the proposal is calculated by code, not written by the AI. To get you started on day one, a new Workspace includes a starter library of general market rates. These are typical industry figures, not your numbers, so treat them as placeholders and replace them with your own over time. If you allow it, MillOS can also look up a current market price online. Any price found that way is marked as an allowance and shows the web page and date it came from. You don't need a complete library before your first bid. MillOS lists anything it can't price and asks how you want to handle it, so your library grows one bid at a time. Importing your existing price list takes one Excel or CSV upload.

Line by line. Approve or reject any line, change a quantity or rate, answer RFIs, leave notes, and send it back to MillOS for another pass.

A quantity you type in is kept as you entered it, shown next to the measured one, and never overwritten by a later run. You can edit the published workbook right inside MillOS, and each new version notes what it replaces. If you want, a Workspace setting can require every line to be checked before sign-off. The workbook prints Prepared by and Checked by, each line keeps a history of checks and notes with names attached, and a copy of the signed-off version is saved.

Yes. Everyone in your Workspace can open the same Project and Chat.

The workbook shows who else is editing and won't let anyone save over a newer version. Each room shows the initials of whoever checked it, so two people can split a job by floor or by room and see each other's progress.

Yes. It learns how your shop works: how you group lines, what you never bid, and which certifications you hold. It doesn't carry prices from one bid to the next yet. That's coming next.

When you correct something, it can be saved as a written rule in your Workspace Memory, and every future bid reads it. MillOS never saves quantities, prices, rooms or sheets to Memory, so a one-off decision on one job never becomes your shop standard. You can also upload an old bid to a Project and ask questions about it.

You own it, and no one trains AI on it. Not MillOS and not the AI providers we use.

Our Terms state that your shop owns everything it uploads and everything MillOS creates for it: drawings, specs, rates, your Product Library, Memory, Chats, takeoffs, workbooks and proposals. MillOS runs on Anthropic's AI models through Amazon Bedrock. Anthropic's commercial terms prohibit training on customer data, and Amazon Bedrock doesn't share your data with model providers or use it for training. MillOS doesn't train any model on your content and doesn't pool data or prices across shops.

Only the people you invite to your Workspace. Nothing is shared with other shops.

Every file, Chat and estimate belongs to your Workspace. Viewing requires Workspace membership, and making changes requires the estimator role. Your rates and library are never used to price another shop's bid. Every new Workspace starts from the same starter library, which is a general template, not another shop's data. MillOS staff only open your content if you ask for help, to fix a problem affecting your account, or if the law requires it. Our system logs record the steps, timing and cost of each AI task, but not your messages, drawings or documents.

Your data is stored in the United States. When MillOS works on your documents, it does so on a private, temporary computer that has no internet connection and is deleted when the job is done.

Only a handful of services ever touch your data, and each one does a single job: sign-in and file storage, the web app, the system that runs the estimating work, and the AI models. Every one of them is named in our Privacy Policy. When MillOS works on your drawings and specs, it opens them on a separate computer set up just for that Chat. That computer is cut off from the internet, and it's deleted as soon as the work is finished.

Yes. Everything can be downloaded, and you can delete files, Projects, your account or your entire Workspace yourself.

Your workbook is a standard Excel (.xlsx) file. You can open and edit it inside MillOS with the built-in spreadsheet, or download it and open it in Excel on your own computer. Your Product Library exports as Excel or CSV. Deleted items stay in a Recycle Bin for 30 days and are then permanently removed. If you ever decide to leave, you can download everything first. And if we ever shut the service down, your Workspace stays open in read-only mode for 30 days so you can take what you need.

Set up your Workspace, import your price list, and run your first bid.

Invite your team, upload your price list as a spreadsheet, and write a short page of shop rules: the certifications you hold, the work you never bid, how you like lines grouped, and whether MillOS may look up prices online. Then create a Project, upload the bid package as PDFs, and start a Chat. For your first run, we recommend a job you've already bid, so you can compare MillOS against an estimate you know well.

You pay per bid, and every new account gets 3 free bids to try it. Founding shops get 10. Full details are on our Pricing page.

Your free bids are full bids, not a limited demo, so you see exactly what MillOS will do on real work. Setting up your Workspace and inviting your team costs nothing. You only pay when you run a bid. Our Pricing page lays out what each bid costs and who qualifies as a founding shop.

Digital PDFs that come straight from the architect. Scanned sheets can work, but plan on checking them more closely.

MillOS measures from the actual lines in the drawing file. A PDF exported from the architect's design software has those lines built in. A scan is just a picture of a printed page, so there are no lines to measure from, and the results need a closer look. If you have a choice, ask the GC for the original digital set. And upload the whole package, including the spec book and every addendum, so MillOS reads everything together.