# Astrolabe vs Unit Convert

The clearest difference is update cadence: Unit Convert at every 3 months against Astrolabe's every 46 months. Unit Convert also leads on device support (4 vs 2) and iOS requirement (15.6 vs 17.6). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Astrolabe sells 2 in-app purchases, starting at $4.49 per month and Unit Convert sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Astrolabe ships an update every 46 months, Unit Convert every 3 months. Both last shipped on October 27, 2026.

## The numbers

| Metric | Astrolabe | Unit Convert |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (15 ratings)](https://appshunter.io/ios/app/unit-convert/id1590954132/reviews)** |
| Number of ratings | — | **15** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 46 months | **Every 3 months** |
| Monetization | — | Free |
| Size | 68 MB | 3 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Dariush Majidi](https://appshunter.io/developer/1740614809) | [River Right Ltd](https://appshunter.io/developer/1515869956) |

## What reviewers say

### Astrolabe

[App page](https://appshunter.io/ios/app/astrolabe/id1501081591)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $4.49 | per month |
| Pro | $48.99 | per year |


### Unit Convert

[App page](https://appshunter.io/ios/app/unit-convert/id1590954132)

This utility app offers seamless unit conversions without ads or accounts. It supports offline use, custom units, and precise fractional inch conversions, making it a powerful tool for everyday and professional needs.

**Highlights:** Ad-free and account-free operation, 100% offline functionality, Custom unit creation, Fractional inch conversion with selectable precision, Feet-inches to metric conversion, Integrated calculator for fractions, Live exchange rates (cached offline)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Exchange Rates | $0.99 | one-time |


## Frequently asked questions

### Is Astrolabe free?

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

### Is Unit Convert free?

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

### Do Astrolabe or Unit Convert have ads?

Neither Astrolabe nor Unit Convert shows ads.

### Which is updated more often, Astrolabe or Unit Convert?

Astrolabe ships an update every 46 months, and Unit Convert every 3 months. Most recently, Astrolabe was updated on October 27, 2026 and Unit Convert on October 27, 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.*