# UnitAi vs File Size Converter

The clearest difference is in-app purchases: UnitAi at none against File Size Converter's 3. File Size Converter's advantage is update cadence (monthly vs every 11 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. File Size Converter sells 3 in-app purchases, starting at $2.99 per 7 days. UnitAi asks for nothing beyond the download.

UnitAi ships an update every 11 months, File Size Converter monthly. The most recent releases landed on October 27, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | UnitAi | File Size Converter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Monthly** |
| Size | 1 MB | 5 MB |
| Requires iOS | 18.5 | **17.0** |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ZERONOON LIMITED](https://appshunter.io/developer/1775736649) | [Phuc Pham](https://appshunter.io/developer/1893081423) |

## What reviewers say

### UnitAi

[App page](https://appshunter.io/ios/app/unitai-storage-unit-converter/id6737280787)

**Features:** macOS Compatibility

**In-app purchases:** none


### File Size Converter

[App page](https://appshunter.io/ios/app/file-size-converter/id6772165773)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Binary Units · Weekly | $2.99 | per 7 days |
| Disk Capacity · Yearly | $14.99 | per year |
| Download Time · Pay Once | $29.99 | one-time |


## Frequently asked questions

### Is UnitAi free?

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

### Is File Size Converter free?

File Size Converter is free to download, with in-app purchases available.

### Do UnitAi or File Size Converter have ads?

Neither UnitAi nor File Size Converter shows ads.

### Which is updated more often, UnitAi or File Size Converter?

UnitAi ships an update every 11 months, and File Size Converter monthly. Most recently, UnitAi was updated on October 27, 2026 and File Size Converter on October 31, 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.*