By Hunter Research and Technology, LLC

Score: 4.74829
From 731 Ratings


Theodolite is a multi-function viewfinder that combines a compass, two-axis inclinometer, rangefinder, GPS, map, nav calculator, and geo-overlay photo/movie camera into one indispensable app. Theodolite was one of the very first augmented reality (AR) apps when it was released in 2009, and it’s been downloaded and used by millions of customers since then. Uses are endless, and the app is great for land measurements, outdoor sports, sightseeing, navigation, and finding your way around. Theodolite is a pro grade app and is used extensively by surveyors, geologists, architects, engineers, competitive sportsmen, first responders, military personnel, and search and rescue workers around the world. Theodolite lets you take data-overlay photos and movies with 2X-8X zoom. Overlay geographical data, angle markings, date/time, author/company info, and project notes directly on photos and movies for later reference. The same data is written into the metadata record of images, making image files self-contained data records. Third-party apps can tap into Theodolite's advanced camera functions with a camera sharing feature. View current position on the built-in map with optional offline Outdoors maps that include topo contours, roads, trails, landmarks, campgrounds, ski lifts, and more. Live map markers continually update distance/heading relative to the current location and also show wayfinding info in the main viewfinder. Draw polygons on the map to mark things like property boundaries and trails, and import/export polygon data via KML. Share map markers and nav calculator points with other users of Theodolite via text messages or e-mail. This powerful capability opens up a wide range of collaborative uses including team land surveying, accident investigations, spotting wild fires, triangulation of landmarks, and advanced tactical observation and targeting. With an optional in-app purchase to enable team tracking, you can share location with up to 20 people on Theodolite's map. Theodolite includes features for serious users like a reference angle mode, nav calculator, map marker import/export, manual and automatic data logging with CSV and KML export, clipboard integration, %grade display, mil compass readout, optical rangefinders (including a mil-based reticle, sniper-style stadiametric graphs, and a variable 4X-24X scope), and night filters to improve use in dark conditions. Theodolite can provide location in military grid reference system (MGRS) coordinates, Universal Transverse Mercator (UTM) coordinates, British/Irish National Grids, US National Grid, Maidenhead locator system, Map Grid of Australia, and six latitude/longitude formats. Optional US State Plane coordinates include SPCS27 and SPCS83 zones covering all US States. The optional Datum Pack adds over 230 geodetic datums to the app to improve position computation from GPS data, covering regions and countries on all continents around the world. AR Layers include navigational aids like the sun, moon, and Polaris (North star), and the optional US Mountain Summits layer that shows over 70,000 US mountain summits in the viewfinder. Theodolite has been shown in Apple Keynotes, featured on the App Store, and has been a #1 selling Navigation app in App Stores around the world. Since its introduction in 2009, Theodolite has defined augmented reality navigation. The app continually introduces new technologies, pushing the limits of iOS app development and taking advantage of new hardware capabilities. Find out why Apple named Theodolite one of the most amazing apps available and showed it being used to explore the Great Wall of China. Where will you take it on your next adventure? Note: Theodolite is an iPhone app -- see “Theodolite HD” for use on an iPad. And be sure to check out the all-new "Theodolite for Watch" and put Theodolite on your wrist!



  • Love it

    By will.serrano82
    Use it regularly for field work for a government highway department. Wish it was on Android, too.
  • I Agree With All Other Positive Reviews

    By LosAngeles90631
    Best app in its class. Has incredible evidentiary value. This app satisfies the needs of so many occupations, from law-enforcement to engineering and construction. This app is fantastic. Records precise GPS coordinates, compass direction, and even angle of the shot. There is absolutely no question of who, what, when, where, and at what angle! Everybody that I show this app purchases it. It’s everything that it says it does - and more.
  • Awesome

    By ruchgz
    This thing is a really useful tool. And no complaints. Very professional
  • Great

    By Asmithdd
    Use it all time in the field when gathering information and photos on projects. Keep all organized. Used to use a whiteboard to write info about picture. Know I place it in notes. I wish they would develop a panoramic feature to the app.
  • Excellent

    By Tenxes
    These Hunter Research apps are quite useful, easy to use and offer terrific utility for anyone who works or plays outdoors. In-app purchases add utility and are well worth the modest expense. (This comment revised to excise remarks about in-app purchases not transferring across devices. See developer statement nearby.)
  • Topography Maps

    By disappointed900134
    Clicked on the Topo Map purchase. 20K available. Not back but which 20K? No description other than you’re purchasing 20K maps. What gives?
  • Glitch

    By Bornorgymus
    Compass is 180degrees out. When I look due South it says due North. What’s wrong? Thanks for the fix
  • Quality photo data app

    By jfamac
    This does a great job! Typically use this to share visit “this spot” with friends. Quality photos as well
  • A fascinating and educational app.

    By Bumpen the Knight
    I have use this for so many interesting things.
  • Works great

    By Super sharks
    Great tool