Your iPhone or iPad can use the free Measure app to take basic measurements. If you have a newer device, you may have more complex measuring options.

The app uses Apple 's Sound Analysis framework to recognize the noises made by a cat. Sound Analysis can identify over 300 specific sounds including laughter, applause, and, of course, meows.

Other Ways to Measure Your IPD If you don’t have access to one of the above devices for an automatic measurement, here’s other ways you can measure your IPD. Online IPD Measure Tool (easiest ...

A newly FDA-cleared app from Sound Life Sciences uses sonar technology to transform an individual’s existing smartphone or smart speaker into a clinical-grade respiratory monitor—completely ...