# Convert Units Calculator vs UnitDeck

The clearest difference is in-app purchases: Convert Units Calculator at none against UnitDeck's 1. UnitDeck's advantage is ads (none vs shown) and update cadence (every 2 weeks vs every 3 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. UnitDeck sells 1 one-off in-app purchase. Convert Units Calculator asks for nothing beyond the download.

Convert Units Calculator ships an update every 3 months, UnitDeck every 2 weeks. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Convert Units Calculator | UnitDeck |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Size | 49 MB | 3 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nelson Lai](https://appshunter.io/developer/1477911199) | [建辉 刘](https://appshunter.io/developer/6790622804) |

## What reviewers say

### Convert Units Calculator

[App page](https://appshunter.io/ios/app/convert-units-calculator/id6758808738)

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

**In-app purchases:** none


### UnitDeck

[App page](https://appshunter.io/ios/app/unitdeck-work-unit-converter/id6792440865)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UnitDeck Pro – Lifetime | $3.99 | one-time |


## Frequently asked questions

### Is Convert Units Calculator free?

Convert Units Calculator is free to download, with no in-app purchases.

### Is UnitDeck free?

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

### Do Convert Units Calculator or UnitDeck have ads?

Convert Units Calculator shows ads; UnitDeck does not.

### Which is updated more often, Convert Units Calculator or UnitDeck?

Convert Units Calculator ships an update every 3 months, and UnitDeck every 2 weeks. Most recently, Convert Units Calculator was updated on October 3, 2026 and UnitDeck on October 2, 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.*