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It reads the dimensions the designer printed on the sheet and sets the scale as the plan opens. The scale card is tagged Auto; tap it to see which printed dimension it used, so you can judge it yourself. You can always set your own instead.

Trace one you know: drag along it, type its length, and the sheet is to scale — the way you would check a print with a scale rule, without the rule.

The points you actually measure between: corners, line ends and the crossings of the drawing's own lines. Tap near a corner and the point snaps onto it. In a tight spot, drag instead — a magnifier shows where the point is going, and you lift when you feel the click.

Vector PDFs — the kind exported from CAD or most architectural software — get automatic scale and snapping. Scanned or photographed plans open too: set the scale yourself and measure freely, without snapping.

Yes. Millimetres and metres, or feet and fractional inches — the labels on the plan follow whichever you pick.

Yes. Name a measurement, give it a nominal size and a tolerance, and it reads PASS or FAIL — the way an inspector works down a snag list.

A flattened PDF with your marks burned in, an image, or a take-off summary as CSV or a one-page PDF — all through the standard iOS share sheet, so it goes to Mail, Messages, Files, AirDrop or any app you like.

Your plans, measurements and notes stay on your phone; nothing is uploaded. The app sends pseudonymous usage counts so we can see what to improve — switch them off in Settings → About → Privacy. Full detail in the Privacy Policy.

An iPhone on iOS 26 or later. The app is in English and Finnish. No account and no connection needed — it works in a basement with no signal.