Dioptra is a camera tool designed for navigation, surveying, positioning, and measurement purposes. With over 30,000 users in 2016, this app functions as a theodolite optical instrument, offering a yaw indicator (compass), pitch indicator (tilt degrees), roll indicator (tilt degrees), GPS position, and azimuth and bearing to the photo subject. Originating from ancient Greek roots, the "dioptra" was a significant astronomical and surveying instrument dating back to the 3rd century BCE.

Dioptra Lite, a variant of the app with more than 35,000 users, provides similar functionalities for camera position and angle measurements. Users can anticipate an upcoming enhanced version of Dioptra with additional features, improved sharing integration, and expanded device compatibility.