# GeoID > Geological structure measurement and analysis tool with stereographic projection and data sharing. (iPhone/iPad app by Sang Ho Lee.) - Source: https://appshunter.io/ios/app/geoid/id437190196 (this page in markdown: same URL + `.md`) - Developer: [Sang Ho Lee](https://appshunter.io/developer/437190199) - Category: Utilities, Reference - Price: $5.99 - Rating: 5.00/5 from 3 App Store ratings · 21 written reviews indexed - Age rating: 4+ - Requires: iOS 7.1 · 6 MB - Languages: American English, Korean - Released: 2011-05-18 - Data updated: 2026-09-09 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/geoid/id437190196/reviews.md ## What is GeoID? * Note : This app uses built-in magnetometer, so iPod Touch does not provides direction of structure/device. GeoID is a professional tool for measuring and analyzing geological structures. This application includes geological compass, stereographic projection, instability analysis and wireless data sharing. • Features - The clinometer works with all attitude of the device and enables user to measure any structure - A stability indicator in the clinometer maximizes its accuracy - Provides many options including notation type, measurement interval, avarage calculation, projection type, etc. - Can input data manually using several input methods - Immediate projection and analysis of selected project - Provides stereonet-based slope stability analysis - Supports zooming while plotting/analyzing - Wireless data transferring via Bluetooth and E-mail - Generates analysis reports with stereonet images and sends them by e-mail - Supports all iOS devices Developed by Engineering Geology & GIS Lab., Dept. of Energy Systems Engineering, Seoul National University, South Korea. Prof. Hyeong Dong Park wishes to express thanks to Prof. Edward Keller and other faculty members of the Earth Sciences Department of University of California Santa Barbara for the useful suggestions and discussions on the improvement of GeoID during Prof. Park's academic visit from 2011-2013. ## Key features - Geological compass - Stereographic projection - Instability analysis - Wireless data sharing - Analysis reports - Manual data input ## Recent user reviews (10 of 21) All indexed reviews: https://appshunter.io/ios/app/geoid/id437190196/reviews.md ### 5/5 — Update the app please *2021-10-03* It has been 6 years now since it was last updated. Please update the app. I regularly use the app. Thanks ### 3/5 — Mr. *2019-07-08* I can't get a hold of tech support. I have two questions. 1) does this app work on an apple 4S iPhone? 2) does the output come relative to true or magnetic north? ### 3/5 — Unable to take photo of discontinuity *2019-02-28* App works well for measuring dip/dip direction but am unable to use app to take photos as app does not ask for permission to use camera. ### 3/5 — Provide editing and support function *2016-07-19* Would be useful to provide a support link for suggested software developments Would also be great if you could edit location data, and provide calibration checks to ensure greater accuracy on recorded data ### 5/5 — Best app for taking attitudes! *2015-03-20* I've been using this app for about 2 years and it is fabulous. I don't even carry a bruton any more, and a few of the other geologists on my team have taken to it as well. I open different projects for bedding and structures, having a stereo net for each lets me see different domains develop as I map. Seeing that real time, in the field is very powerful. I haven't found any app as good as this one. ### 5/5 — TAKE NOTE ON DIP DIRECTION *2014-05-22* The iphone compass can vary by as much as 25 degrees depending upon the orientation of the phone in portrait or landscape mode. Whichever you choose. Be consistent. ### 5/5 — Nice !! *2014-01-13* Stereonet = Rock mechanic, rock and soil, slope stability wow!! Very useful ! Useful app for rock mechanics and rock engineering !!! ### 5/5 — fantastic app *2013-12-11* does what it's meant to. can't fault it considering the hardware it's designed for! maybe some integration with offline maps and GIS layers could be good. ### 5/5 — Great app has everything you need to collect and analyze structural data! *2013-07-26* This app is fantastic! I love the options to plot and analyze your data on stereo nets and rose diagrams, the ability to export a text or csv file, and the option to take a photo along with a measurement. This app is really well designed and easy to use. ### 4/5 — Fast and Accurate *2013-03-19* Fast, Accurate, and Easy to Use ## Frequently asked questions about GeoID ### What geological measurements can GeoID perform? GeoID can measure geological structures using its integrated clinometer, which works in all device attitudes. It also provides a stability indicator to maximize measurement accuracy. ### How does GeoID help with data analysis? GeoID offers immediate projection and analysis of selected projects using stereonet-based slope stability analysis. It supports zooming during plotting and analysis for detailed examination. ### Can I share my geological data with others using GeoID? Yes, GeoID supports wireless data transferring via Bluetooth and E-mail. You can also generate analysis reports with stereonet images and send them directly by email. ### What devices is GeoID compatible with? GeoID is compatible with all iOS devices, including iPhone, iPad, and iPod Touch. However, iPod Touch devices do not provide direction of structure/device due to magnetometer limitations. ### How often is GeoID updated? GeoID was last updated on October 29, 2014, with version 1.80. The app was initially released on May 18, 2011. ### What is the price of GeoID? GeoID is a paid application priced at $5.99. There are no in-app purchases available for this utility. ### What is the age rating for GeoID? GeoID has an age rating of 4+, making it suitable for a wide range of users interested in geological analysis. ### Does GeoID have ads? No, GeoID does not contain advertisements. As a paid utility, it offers an ad-free experience for its users. ## Version history (last 5 releases) ### 1.80 — 2014-10-29 This update from Apple will improve the functionality of this app. No new features are included. iOS 8 compatibility and bug fix. ### 1.71 — 2013-06-13 Minor bug fix. ### 1.70 — 2013-02-02 - Supports iPhone 5 and iOS 6. - Manual input utility accepts decimals. The numbers are expressed as integers but they contains information below decimal point. - Instability analyses can be performed on any projection methods. - Can input variables for instability analysis using keypad. - Exported files can be e-mailed with all photos on iPhone. - A project can be e-mailed with photos using E-mail utility on iPhone. - Fixed a problem that decreases precision of latitude/longitude while sending project wirelessly. ### 1.62 — 2012-09-28 - The clinometer will beep differently if the device is "Unstable". - Records lat/long coordinates to 8 decimal places. - Minor bugs fixed ### 1.61 — 2012-09-01 - Exported file now contains image's name correctly. ## Apps similar to GeoID | App | Rating | Price | Category | | --- | --- | --- | --- | | [Geoid Calculator](https://appshunter.io/ios/app/geoid-calculator/id6754636784) | — | Free | Utilities | | [StraboField](https://appshunter.io/ios/app/strabofield/id1555903455) | 4.5 (19) | Free | Utilities | | [Lambert](https://appshunter.io/ios/app/lambert/id341216494) | 5.0 (4) | Free | Utilities | | [Ness iComms](https://appshunter.io/ios/app/ness-icomms/id514504746) | 5.0 (1) | $14.99 | Utilities | | [eMIX - The Smart Valve](https://appshunter.io/ios/app/emix-the-smart-valve/id1565508992) | — | Free | Utilities | | [PassFM - Private File Manager](https://appshunter.io/ios/app/passfm-private-file-manager/id980936769) | 3.7 (9) | $2.99 | Utilities | ## Related topics [geoid](https://appshunter.io/ios/topics/geoid) · [stereonet](https://appshunter.io/ios/topics/stereonet) · [quadrant stereonet plotter](https://appshunter.io/ios/topics/quadrant-stereonet-plotter) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-09.*