rulerONE SCALE. TWO PERSPECTIVES.
A little comparison.
Measure something. Make room for a friend’s measurement.
LET’S START AGAIN
This link couldn’t be opened.
Start a new comparisonFIRST, YOUR MEASUREMENT
What are we comparing?
Choose one thing to measure, then invite a friend to add theirs.
A MEASUREMENT TO COMPARE
THE DIFFERENCE
Calculated from the saved measurements. “≈” marks a rounded display value; measuring accuracy depends on your tools.
Need to measure first?
Open the calibrated screen ruler in a new tab ↗, measure your object, then enter its length here. Check the ruler’s calibration against a physical reference first.
Using the iPhone or iPad app?
Measure and choose Freeze → Compare with a friend. To answer an invitation, choose Reply and paste the invitation link. Your frozen measurement becomes the second entry; share the new comparison back.
A snapshot, carried by its link.
These links contain the measurements themselves. There are no accounts, location requests or background updates. This page does not save a measurement history; your browser history and sharing app may retain the link. Anyone with a link can read, copy or change the data in it.
A reply creates a different link. Earlier links stay unchanged. Links do not expire, and there is no way to recall or delete copies someone already has. Share only information you want the recipient to see.