# Lambert vs Outcropedia

The clearest difference is update cadence: Outcropedia at every 2 months against Lambert's every 5 months. Outcropedia also leads on iOS requirement (13.0 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Lambert ships an update every 5 months, Outcropedia every 2 months. The most recent releases landed on June 1, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Lambert | Outcropedia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/lambert/id341216494/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 2 MB | 78 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Peter Appel](https://appshunter.io/developer/341216497) | [WEBMAPP SRL](https://appshunter.io/developer/1245612450) |

## 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


### Outcropedia

[App page](https://appshunter.io/ios/app/outcropedia/id1560808122)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Lambert free?

Lambert is free to download, with no in-app purchases.

### Is Outcropedia free?

Outcropedia is free to download, with no in-app purchases.

### Do Lambert or Outcropedia have ads?

Neither Lambert nor Outcropedia shows ads.

### Which is updated more often, Lambert or Outcropedia?

Lambert ships an update every 5 months, and Outcropedia every 2 months. Most recently, Lambert was updated on June 1, 2026 and Outcropedia on September 12, 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.*