# Conversion Calculator Units vs SM Calculator

The clearest difference is in-app purchases: SM Calculator at none against Conversion Calculator Units's 1. SM Calculator also leads on ads (none vs shown) and update cadence (daily vs every 2 months). Conversion Calculator Units's advantage is ratings volume (5K vs 2) and 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. SM Calculator asks for nothing beyond the download.

SM Calculator holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Conversion Calculator Units has 5K ratings behind it against 2, so its average is the more settled of the two.

Conversion Calculator Units ships an update every 2 months, SM Calculator daily. The most recent releases landed on September 25, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Conversion Calculator Units | SM Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (5K ratings)](https://appshunter.io/ios/app/conversion-calculator-units/id727632233/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sm-calculator/id1663949657/reviews)** |
| Number of ratings | **5K** | 2 |
| Positive reviews | 82.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 41 MB | 8 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [RV AppStudios LLC](https://appshunter.io/developer/340181308) | [Body Culture](https://appshunter.io/developer/910681467) |

## 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


### SM Calculator

[App page](https://appshunter.io/ios/app/sm-calculator/id1663949657)

Easily convert between standard and metric units for calculations. Supports decimal and fraction values in inches, and millimeters. Tap values to see equivalents or add them to a pin list for quick access.

**Highlights:** Cross-unit calculations, Decimal and fraction support, Metric unit conversion, Tap to convert values, Pin list for quick access, Conversion table

**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 SM Calculator free?

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

### Which has better reviews, Conversion Calculator Units or SM Calculator?

SM Calculator is rated higher. Conversion Calculator Units averages 4.7 out of 5 from 5K ratings, while SM Calculator averages 5.0 from 2 ratings.

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

Conversion Calculator Units shows ads; SM Calculator does not.

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

Conversion Calculator Units ships an update every 2 months, and SM Calculator daily. Most recently, Conversion Calculator Units was updated on September 25, 2026 and SM Calculator on September 18, 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.*