# Lambert vs GeoID

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.

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.

## The numbers

| Metric | Lambert | GeoID |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/lambert/id341216494/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/geoid/id437190196/reviews) |
| Number of ratings | **4** | 3 |
| Positive reviews | **75.0% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 6 weeks** |
| Monetization | **Free** | Paid |
| Size | 2 MB | 6 MB |
| Requires iOS | 16.6 | **7.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Peter Appel](https://appshunter.io/developer/341216497) | [Sang Ho Lee](https://appshunter.io/developer/437190199) |

## What reviewers say

### Lambert

[App page](https://appshunter.io/ios/app/lambert/id341216494)

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:** macOS Compatibility

**In-app purchases:** none


### GeoID

[App page](https://appshunter.io/ios/app/geoid/id437190196)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*