# Smart Unit Conversion vs OLBY

The clearest difference is in-app purchases: OLBY at none against Smart Unit Conversion's 1. OLBY also leads on iOS requirement (9.3 vs 13.4). Smart Unit Conversion's advantage is device support. On price there is nothing between them.

Both are free to download. Smart Unit Conversion sells 1 in-app purchase, starting at $1.99 per year. OLBY asks for nothing beyond the download.

## The numbers

| Metric | Smart Unit Conversion | OLBY |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | — |
| Update frequency | Every 15 months | — |
| Size | 41 MB | 17 MB |
| Requires iOS | 13.4 | **9.3** |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 17+ | 4+ |
| Developer | [Yui Lau](https://appshunter.io/developer/1791465155) | [长金 赵](https://appshunter.io/developer/1107811328) |

## What reviewers say

### Smart Unit Conversion

[App page](https://appshunter.io/ios/app/smart-unit-conversion/id1643381985)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Year | $1.99 | per year |


### OLBY

[App page](https://appshunter.io/ios/app/olby/id6463584602)

**In-app purchases:** none


## Frequently asked questions

### Is Smart Unit Conversion free?

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

### Is OLBY free?

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

---

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