Support

Questions, bugs and things that should work differently.

Write to mr.dyuven@gmail.com. Say which phone and which iOS, which instrument, and what it showed against what you expected — a photo of the phone next to the thing being measured says more than a paragraph.

Common questions

The level says the surface is tilted when I can see it is flat

Usually the phone, not the surface. The camera block stands a millimetre or two above the back, so a phone lying on its back lies at a slight angle. Put the phone where you want to measure from and tap Set zero here: from then on the reading is about the surface rather than about the phone. Clear zero, which appears underneath once a zero is set, puts the phone's own zero back.

The ruler shows the wrong length

The scale comes from the pixel density of your screen, which the app knows for shipped iPhones. If it is wrong, or if the app does not know your device, calibrate it: lay any bank card along the scale and drag the handle to the end of the card. Every payment card is 85.6 mm along the long edge — that is the standard, not an estimate.

A calibration that disagrees with the known density of your screen by more than a fifth is refused rather than stored, because that is a mis-drag rather than a measurement. Reset calibration, on the calibration sheet itself, puts the scale back to the device value.

What is the difference between centimetres and millimetres?

Only how the number is written: 18 cm and 180 mm are the same length. The choice matters on the ruler, where millimetres give you one more digit, and nowhere else. Inches are drawn in sixteenths, as a tape measure is.

The angle does not match my protractor

Check which number you are reading. The clinometer shows the slope of the surface in degrees and the same slope in per cent — a ramp at 45° is 100%, not 45%. Per cent is how ramps and roofs are usually specified and it is not the same scale as degrees.

How accurate is it?

It is an approximate instrument. It reads the sensors Apple put in the phone, and those are good to a fraction of a degree in good conditions and worse on a cold morning with the phone in one hand. It is made for hanging a shelf, levelling a washing machine and checking a ramp. It is not a calibrated instrument and should not be used where one is required.

The magnifier is blurry

The lens has a closest distance it can focus at, and pushing the phone nearer than that makes things worse rather than bigger. Pull back a little and let the zoom do the work, and switch the torch on — small print is usually in shadow, because your own hand is over it.

I paid and it still shows ads

Settings → Restore purchase, with the same Apple ID that paid. If it still finds nothing, write and include the email of that Apple ID. The purchase is a single payment and does not expire; there is nothing to renew and nothing to cancel.

Why does it ask for the camera?

Only the magnifier uses it, and only while the magnifier is open. Decline and the other three instruments work exactly as before. Nothing is photographed or saved — see the privacy policy.

Why does it ask about tracking?

Because it shows ads. Decline and the ads are simply not personalised; nothing else changes. Removing the ads entirely is the one purchase in the app.

Does it work without the internet?

Every instrument does. Only the ads need a connection, and when there is none the app skips them.