Theodolite

Theodolite is built for people who need angles, bearings, coordinates, and a few other field measurements from an iPhone or iPad rather than from a dedicated instrument. By our assessment, its best trait is the way it compresses several specialist tools into one app, so it can act like a compass, clinometer, rangefinder-style aid, and map overlay in the same package. The ceiling is set by the phone itself: it is handy for rough outdoor work, but it does not replace survey gear when precision matters. In use it feels technical without being fussy, which is why hikers, sailors, and other field users have long treated apps like this as pocket tools. Against full navigation apps it is more about measurement than turn-by-turn guidance, and against real instruments it is the lighter, cheaper compromise. Theodolite is strongest when the task is quick field checking, not formal surveying.