# Lambert vs Keyword Density

The clearest difference is price: Lambert at Free against Keyword Density's $1.99. Keyword Density's advantage is iOS requirement (11.0 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

Lambert is free to download; Keyword Density costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Lambert | Keyword Density |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| 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 | — |
| Monetization | Free | — |
| Size | 3 MB | 24 MB |
| Requires iOS | 16.6 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Peter Appel](https://appshunter.io/developer/341216497) | [Solaz Dazen srl](https://appshunter.io/developer/802275887) |

## 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


### Keyword Density

[App page](https://appshunter.io/ios/app/keyword-density-seo-edition/id1471329886)

**In-app purchases:** none


## Frequently asked questions

### Is Lambert free?

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

### Is Keyword Density free?

Keyword Density costs $1.99, with no in-app purchases.

### Do Lambert or Keyword Density have ads?

Neither Lambert nor Keyword Density shows ads.

---

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