A free alternative to On-Screen Takeoff, honestly.
There is no free On-Screen Takeoff, and no free tool does everything OST does. But more of the job is free than most people realise, and the paid options that replace it do not all cost a per-seat licence. This is the straight version.
Is there a free version of On-Screen Takeoff?
No. On-Screen Takeoff is sold by ConstructConnect as a per-seat subscription for Windows and there is no free tier. When people search for a free alternative they usually mean one of three things: the measuring tools inside a PDF viewer, a time-limited trial of a paid tool, or a free calculator for one specific quantity. All three exist, and each stops well short of what OST does.
Worth saying plainly before the rest: On-Screen Takeoff earns its price for the people who use it all day. It is precise, deep and quick once your hands know it. The question this page answers is not whether OST is worth the money. It is what you can actually get done without spending any, and where the line is.
What is genuinely free in 2026
The measuring tool in your PDF viewer
Nearly every serious PDF viewer, including the free Adobe Acrobat Reader, has a measure tool. Set the scale from a known dimension on the sheet, then click to get lengths and areas. For a single small sheet, a quick sanity check on a sub's number, or a change-order sketch, it is honestly all you need. You cannot build assemblies, you get no running totals across sheets, and counting is you clicking and tallying on paper. But it costs nothing and you already have it.
A Bluebeam trial
Bluebeam Revu is a markup and measurement tool rather than a takeoff system, but its measurement tools are good and it offers a trial. If you have a bid due next week and no software, a trial gets you through it. After that it is a paid per-user licence, and it is Windows; the Mac version was discontinued.
Free takeoff calculators
Our takeoff calculators are free, permanently, with no sign-up. They handle the arithmetic side of a takeoff: drywall, framing, concrete, rebar, CMU block, paint coverage, doors and hardware, windows, HVAC, plumbing, conduit fill, wire size, voltage drop, pipe sizing, and a takeoff ROI calculator. They will not read a plan for you, but if you have the raw measurements they turn them into quantities you can price.
A full automated takeoff on your own plans
Pilars is not a free product, but the demo is free and it runs on your own plan set, not a canned sample. Upload the PDF, pick the trade, and you get back the real output: counts, lengths, areas, confidence scores and sheet references. It is the closest thing on this page to a free On-Screen Takeoff, with the difference that it does the measuring instead of handing you the tools.
And, in fairness, there is the original free method: a printed set, a scale ruler and three colours of highlighter. It still works. Plenty of excellent estimators started there, and the reason they stopped is the same reason the free digital options fall over: time.
What a free tool cannot do
The gap between a PDF measure tool and On-Screen Takeoff is not a few features, it is the whole workflow. Free tools stop at the click. Here is what you carry yourself when you use one:
- Counting. A measure tool measures. Counting two hundred receptacles on a power plan is you, a tally, and a coloured dot on each one so you do not double up.
- Cross-sheet references. The fixture schedule is on one sheet, the fixtures are on eleven others, and the spec book overrides both. No free viewer reconciles that. OST at least keeps your conditions organised; a viewer does not know what a condition is.
- Running totals. Every measurement in a viewer is an island. You retype it into a spreadsheet and hope you did not miss a sheet.
- Revisions. Addendum 3 arrives and the sheet changes. In a takeoff tool you re-measure the affected conditions. In a viewer you start that sheet again and try to remember what you had.
- A second pair of hands. There is no shared project, so there is no way for a colleague to open the same takeoff and pick up where you left off.
None of that is a reason to feel bad about using free tools. It is a reason to be clear about the price you are paying, which is hours. A manual commercial takeoff runs 40 to 80 hours. A free tool does not shrink that number; it just removes the licence line beneath it.
The real cost math: per seat versus per trade
This is where the free question usually turns into a cheaper question. On-Screen Takeoff is priced per seat, so the cost scales with how many people you want doing takeoff. Add an estimator, add a seat. Add a project manager who wants to open the file, add a seat. It is the standard model for desktop software and it is the reason small shops end up with one licence and one person who is allowed to use it.
Pilars is $100 per trade, per plan set. Not per user, not per month, not per seat. Unlimited projects and unlimited users on the account. If your shop bids four electrical sets a month, that is $400 for the month, and every person on the team can open every takeoff. If a bid dies before you price it, you have spent $100 on a takeoff you can reuse when it comes back next year.
Put your own numbers against it. Take the loaded hourly rate of whoever does takeoff, multiply by the 40 to 80 hours a manual commercial set takes, and compare it with $100 plus the review time. The ROI calculator does the arithmetic if you would rather not. For most subs the answer is not close, which is why we would rather talk about that than about being free.
Free and manual vs On-Screen Takeoff vs Pilars
| Capability | Free / manual (PDF viewer, paper) | On-Screen Takeoff | Pilars |
|---|---|---|---|
| Price | $0 | Per-seat subscription | $100 per trade, per plan set |
| Platform | Anything | Windows desktop | Browser, any OS including Mac |
| Who does the measuring | You | You, with excellent tools | Pilars; you review |
| Counts devices and fixtures | By hand | Click each one | Automatic, confidence-scored |
| Reads the spec book and schedules | No | No | Yes |
| Code-compliance flagging | No | No | Yes (IBC, NEC, IPC, IMC, ADA, NFPA) |
| Shared projects, multiple users | No | Per seat | Unlimited users |
| Export to estimate | Retype | Quick Bid, Excel | BOQ and Excel export |
| Best for | One sheet, a sanity check | Full-time manual estimators on Windows | Bidding volume, any machine, review-first |
Based on public documentation as of 2026. On-Screen Takeoff and Bluebeam are trademarks of their owners; this is an independent comparison.
How to try the whole thing free before paying anything
Take the last set you did by hand. Upload it to the demo, choose the trade, and let it run. Then put the output beside your own count. You will see three kinds of line: quantities that match, quantities where the confidence score is low and it tells you to look, and the occasional one where you were wrong. That comparison is the real test of any takeoff tool, free or not, and it is the one a feature list cannot give you.
If the numbers hold up, the next set is $100. If they do not, you have lost half an hour and you still have the calculators, which are free forever regardless.
Questions estimators actually ask
Is there a free alternative to On-Screen Takeoff?
Not a like-for-like one. Free options are the measure tool in a PDF viewer, a time-limited trial of a paid tool such as Bluebeam, free takeoff calculators, and the free Pilars demo that runs a full automated takeoff on your own plan set.
Is On-Screen Takeoff free or does it have a free version?
No. On-Screen Takeoff is a per-seat subscription from ConstructConnect for Windows. Check ConstructConnect for current trial terms; there is no permanently free tier.
What free on screen takeoff software can I actually use?
The free Adobe Acrobat Reader measure tool handles lengths and areas once you set a scale, and other PDF viewers have similar tools. They do not count, build assemblies, keep running totals or share projects.
Can I do a construction takeoff for free in a PDF viewer?
For a single sheet or a quick check, yes. For a full commercial set you will spend the same 40 to 80 hours a manual takeoff always takes, retyping every measurement into a spreadsheet.
Is Pilars free?
Pilars is not a free product. The demo on your own plans is free and the takeoff calculators are free forever. A full takeoff is $100 per trade, per plan set, with unlimited users and no per-seat fee.
How does the cost of Pilars compare with an On-Screen Takeoff seat?
On-Screen Takeoff charges per seat, so cost grows with headcount. Pilars charges $100 per trade per plan set with unlimited users, so cost grows with the number of bids you run, not the number of people.
Are the Pilars takeoff calculators really free?
Yes. They are free, permanent and do not require a sign-up. They handle the arithmetic side of a takeoff once you have measurements; they do not read plans.