Comparison

Lambert vs GeoID

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

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.

Highlights
  • Geological compass
  • Stereographic projection
  • Instability analysis
  • Wireless data sharing
  • Analysis reports
  • Manual data input
Features
Read full description

* 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

Lambert4 screens
GeoID4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Lambert is free to download; GeoID costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Lambert versus GeoID: the parameters behind the verdict, then further details
ParameterLambertGeoID
PriceFree — better$5.99
Rating5.0 (4 ratings)5.0 (3 ratings)
Positive reviews75.0% of reviews — better66.7% of reviews
Number of ratings4 — better3
Update frequencyEvery 5 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.67.1 — better
Further details — not scored
Size2 MB6 MB
Age rating4+4+
DeveloperPeter AppelSang Ho Lee

Customer experience

Lambert

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews16 reviews
Positive75.0%
Neutral6.3%
Negative18.8%

GeoID

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews21 reviews
Positive66.7%
Neutral28.6%
Negative4.8%

In-app purchases

None

Lambert

No in-app purchases

None

GeoID

No in-app purchases

Questions

Is Lambert free?
Lambert is free to download, with no in-app purchases.
Is GeoID free?
GeoID costs $5.99, with no in-app purchases.
Which has better reviews, Lambert or GeoID?
Lambert and GeoID are both rated 5.0 out of 5 on the App Store, from 4 and 3 ratings respectively.
Do Lambert or GeoID have ads?
Neither Lambert nor GeoID shows ads.
Which is updated more often, Lambert or GeoID?
Lambert ships an update every 5 months, and GeoID every 6 weeks. Most recently, Lambert was updated on June 1, 2026 and GeoID on September 9, 2026.

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