# Lambert vs Convert Me

The clearest difference is rating: Lambert at 5.0 against Convert Me's 4.3. Lambert also leads on in-app purchases (none vs 3) and review sentiment (75% vs 50%). Convert Me's advantage is ratings volume (34 vs 4). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Convert Me sells 3 in-app purchases, starting at $3.99 per year. Lambert asks for nothing beyond the download.

Lambert holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Convert Me has 34 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 75% of Lambert's written reviews are positive against 50% of Convert Me's.

Lambert ships an update every 5 months, Convert Me every 4 months. The most recent releases landed on October 23, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Lambert | Convert Me |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/lambert/id341216494/reviews)** | [4.3 (34 ratings)](https://appshunter.io/ios/app/convert-me-video-audio-pdf/id6449506753/reviews) |
| Number of ratings | 4 | **34** |
| Positive reviews | **75.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 31 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Peter Appel](https://appshunter.io/developer/341216497) | [哲铭 葛](https://appshunter.io/developer/1606918460) |

## 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


### Convert Me

[App page](https://appshunter.io/ios/app/convert-me-video-audio-pdf/id6449506753)

This app offers versatile audio and video conversion, compression, and PDF manipulation. Easily convert between formats, extract audio, reduce file sizes, and rearrange PDF pages. It's designed for both professionals and everyday users needing efficient file processing.

**Highlights:** Video conversion between MP4, AVI, MOV, MKV, FLV, Audio extraction from videos, Video compression for storage saving, PDF page rearrangement, Export PDF pages as images, Fast conversion engine, Intuitive user interface

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual | $3.99 | per year |
| Lifetime | $6.99 | one-time |
| Lifetime Pro | $19.99 | one-time |


## Frequently asked questions

### Is Lambert free?

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

### Is Convert Me free?

Convert Me is free to download, with in-app purchases available.

### Which has better reviews, Lambert or Convert Me?

Lambert is rated higher. Lambert averages 5.0 out of 5 from 4 ratings, while Convert Me averages 4.3 from 34 ratings.

### Do Lambert or Convert Me have ads?

Neither Lambert nor Convert Me shows ads.

### Which is updated more often, Lambert or Convert Me?

Lambert ships an update every 5 months, and Convert Me every 4 months. Most recently, Lambert was updated on October 23, 2026 and Convert Me on October 18, 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.*