By Hunter Research and Technology, LLC

Score: 4.5
From 1,643 Ratings


Theodolite HD 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 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 camera images and movies, with 2X-8X digital zoom and fast image processing. You can overlay geographical data, date, time, and custom notes directly on photos and movies for later reference. View your current position on the built in map, with optional new offline Outdoors maps that include topo contours (feet or meters), 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 on the main camera screen. 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 which include team land surveying, accident investigations, spotting of wild fires, triangulation of landmarks, and advanced tactical observation and targeting operations. Theodolite includes features for serious users like a reference angle mode, nav calculator, map marker import/export, data logging with CSV and KML export (via e-mail or iCloud Drive), system-wide clipboard integration, percent grade display, mil compass readout, optical rangefinders (including a mil-based reticle, sniper-style stadiametric graphs, and a variable 4X-24X scope), and colored lens filters to improve use in dark conditions and preserve night vision. 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, 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 for more accurate position computation from GPS data, covering regions and countries on all continents around the world. With an optional in-app purchase to enable team tracking, you can share location with up to 20 people on Theodolite's map. Team tracking was developed in conjunction with search and rescue experts to offer a good balance between simplicity and performance. 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? Theodolite requires an iPhone or iPod touch (see the “Theodolite HD” app for use on iPad).



  • Useful app

    By Fabflockfinder
    Would buy again. As a biologist, I use this app to take watermarked date time latitude longitude elevation stamped photos.
  • Useful

    Very cool app
  • Exceptional

    By 1gismo
    A very useful and effective tool. A truly good buy.
  • Very nice field tool

    By Church_Lady
    We use this for all kinds of field survey and engineering planning. It’s a fantastic tool to use with the the iPhone.
  • Great handheld theodolite!

    By wingwiper
    I’ve been using this for quite some time to do rough construction layout and site mapping. It’s really nice to have the tool in my pocket so I don’t have to dig out the big theodolite just for estimates. Plus it provides information that supplements my actual theodolite!
  • Great app

    By Cash Construction
    Very cool
  • Powerful multipurpose measurement tool

    By Sbsbnshshsbbsbsbshshbsb
    Many uses, all theodolite capability plus use of the iPhone sensors for angular and compass measurement and ability to capture photos with metadata.
  • Swiss Army knife of apps

    By Filmath
    The tool to have in your digital pocket.
  • Fascinating & fun

    By WTadPf
    And a good pedagogical tool (I teach surveying) ...And a year later: Still good!
  • iPhone X problems

    By Wweverett
    Will not allow me to exit the app, I have to do a hard restart of phone to exit. I would advise not to purchase. Re-evaluated I was not realizing how to get out of the app. It works awesome!