Lambert vs GeoID
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lambert
This application transforms your iPhone into a specialized geological compass. It accurately measures the dip direction and angle of geological strata, displaying real-time orientation data. Measurements can be enhanced with text and plotted on a map for easy transfer to your computer.
- Geological compass functionality
- Measure dip direction and angle
- Real-time stereographic projection
- Wulff and Schmidt Net projection diagrams
- Add text to measurements
- Plot measurement localities on a map
- Transfer data to computer
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This app turns your iPhone into a geological compass, a tool for each geologist. It can be used to measure the direction of dip and the angle of dip of geological strata. The app shows the current device orientation in a realtime stereographic projection. The data can be previewed in projection diagrams (Wulff and Schmidt Net) and transferred to your computer. You can add text to the measurements and plot the measurement localities on a map.
GeoID
A professional tool for measuring and analyzing geological structures. It features a geological compass, stereographic projection, and instability analysis with wireless data sharing capabilities.
- Geological compass
- Stereographic projection
- Instability analysis
- Wireless data sharing
- Analysis reports
- Manual data input
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* 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.
Screenshots
Verdict
The clearest difference is price: Lambert at Free against GeoID's $5.99. Lambert also leads on review sentiment (75% vs 67%). GeoID's advantage is update cadence (every 6 weeks vs every 5 months) and iOS requirement (7.1 vs 16.6). On rating, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Lambert is free to download; GeoID costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Lambert against 5.0 for GeoID. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews are what separate them: 75% of Lambert's written reviews are positive against 67% of GeoID's.
Lambert ships an update every 5 months, GeoID every 6 weeks. The most recent releases landed on June 1, 2026 and September 9, 2026 respectively.
| Parameter | Lambert | GeoID |
|---|---|---|
| Price | Free — better | $5.99 |
| Rating | 5.0 (4 ratings) | 5.0 (3 ratings) |
| Positive reviews | 75.0% of reviews — better | 66.7% of reviews |
| Number of ratings | 4 — better | 3 |
| Update frequency | Every 5 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 7.1 — better |
| Further details — not scored | ||
| Size | 2 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Peter Appel | Sang Ho Lee |
Customer experience
Lambert
GeoID
In-app purchases
Lambert
No in-app purchases
GeoID
No in-app purchases









