# Lambert vs Sessagesimale

The clearest difference is price: Lambert at Free against Sessagesimale's $2.99. Sessagesimale's advantage is update cadence (every 5 days vs every 5 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Lambert is free to download; Sessagesimale costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Lambert ships an update every 5 months, Sessagesimale every 5 days. The most recent releases landed on October 23, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Lambert | Sessagesimale |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| 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 | **Every 5 days** |
| Monetization | Free | — |
| Size | 3 MB | 2 MB |
| Requires iOS | 16.6 | 16.6 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Peter Appel](https://appshunter.io/developer/341216497) | [Vittorio Spinelli](https://appshunter.io/developer/578284642) |

## 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


### Sessagesimale

[App page](https://appshunter.io/ios/app/sessagesimale-calculator/id6798383933)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is Lambert free?

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

### Is Sessagesimale free?

Sessagesimale costs $2.99, with no in-app purchases.

### Do Lambert or Sessagesimale have ads?

Neither Lambert nor Sessagesimale shows ads.

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

Lambert ships an update every 5 months, and Sessagesimale every 5 days. Most recently, Lambert was updated on October 23, 2026 and Sessagesimale on November 1, 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.*