# Conversion Calculator Units vs OCMC

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

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

Conversion Calculator Units ships an update every 2 months, OCMC monthly. The most recent releases landed on October 13, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Conversion Calculator Units | OCMC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (5K ratings)](https://appshunter.io/ios/app/conversion-calculator-units/id727632233/reviews)** | — |
| Number of ratings | **5K** | — |
| Positive reviews | 82.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 70 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [RV AppStudios LLC](https://appshunter.io/developer/340181308) | [Live Laps](https://appshunter.io/developer/1748038294) |

## What reviewers say

### Conversion Calculator Units

[App page](https://appshunter.io/ios/app/conversion-calculator-units/id727632233)

This app offers a simple and powerful way to convert between over 140 units across 12 categories. Easily switch between units, customize your experience with themes, and share your results.

**Highlights:** Converts over 140 units, Supports 12 conversion categories, Customizable themes, Drag and set unit positions, Add units to favorites, Share converted units via email

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |

**What reviewers like**

- 👍 User-friendly
- 🚀 Easy to use
- 💡 Helpful for learning metric system
- 👍 Great for conversions
- 👍 Intuitive interface

**What reviewers complain about**

- 🐛 Ads disrupt usage
- 🐛 Difficult to change units
- 🐛 Lacks portrait mode
- 🐛 Upside-down orientation issues
- 🐛 Cluttered UI design

**Reported bugs**

- Ads not removed after purchase
- Incorrect unit conversions

**Requested features**

- Add pressure conversion units
- Include a basic calculator function
- Implement multi-language support
- Allow customization of unit order


### OCMC

[App page](https://appshunter.io/ios/app/ocmc/id6746144967)

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

**In-app purchases:** none


## Frequently asked questions

### Is Conversion Calculator Units free?

Conversion Calculator Units is free to download, with in-app purchases available.

### Is OCMC free?

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

### Do Conversion Calculator Units or OCMC have ads?

Conversion Calculator Units shows ads; OCMC does not.

### Which is updated more often, Conversion Calculator Units or OCMC?

Conversion Calculator Units ships an update every 2 months, and OCMC monthly. Most recently, Conversion Calculator Units was updated on October 13, 2026 and OCMC on October 1, 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.*