Takeoff Studio - free
Read the scale from the title block in one click, with a check on the paper size. Measure details at another scale with scale regions. Name every page from its title block with the drawing register, and search the text on every drawing. All free.

In the PDF tab choose Set Scale from Title Block. Takeoff Studio finds notes such as 1:100 @ A1 or 1/4" = 1'-0" and sets the page's scale in one click.
If an A1 drawing has been saved at A3, it warns you and offers the scale at this size (1:100 @ A1 on an A3 page measures 1:200). Always check one known dimension.
Choose Scales (W) and draw a region round a detail or viewport, then pick its printed scale or calibrate it. Everything measured inside it uses that scale.
Drawing Register reads each title block's sheet number, title, revision and scale. Accept them and they become your page names. Export the register as CSV.
Press Ctrl+F to find a door number, a room name or a note on every page, and go straight to it.


Help: Drawing sets has every option in detail.
Free in Takeoff Studio. Measuring is free and always will be - no time limit, no account. Takeoff Studio Pro is there if you want to price and export your takeoffs.
No. The title block scale, the register and text search use the text inside the PDF. A scanned drawing has no text to read, so calibrate it from a dimension. Takeoff Studio tells you which pages these are.
Not to scale. A sheet marked NTS can't be scaled from its note - calibrate from a dimension instead.
You get a warning and it's listed in Checks. It uses the scale where it starts.
Yes. In View Options choose Units for feet and inches, decimal feet, sq ft and cu yd, and calibrate from lengths such as 12' 6".
Yes - the title block scale, scale regions, the drawing register with CSV export, text search and imperial units are all free.

Click inside a room and it's traced to the walls. Auto walls measures walls on CAD drawings.

Floor, ceiling, wall and skirting quantities for every room, with totals per finish and level.

One measurement becomes every item it needs. Then an Excel bill in NRM2 order with live formulas.

Lay the new issue over the old one. Every change is boxed, listed and ready to cloud.

Box one socket or light and every match is found and ringed for you to check.

Voids out of areas, joists and studs at centres, repeated rooms and pitched roofs.
Measuring is free. Takeoff Studio Pro is £24.99 a month or £199.99 a year, and the first month is free.