# SM Calculator vs Conversion Calculator

The clearest difference is in-app purchases: SM Calculator at none against Conversion Calculator's 1. SM Calculator also leads on update cadence (daily vs every 5 weeks) and rating (5.0 vs 4.8). Conversion Calculator's advantage is ratings volume (157 vs 2) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Conversion Calculator 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 4.8. That said, the two scores are not equally well evidenced: Conversion Calculator has 157 ratings behind it against 2, so its average is the more settled of the two.

SM Calculator ships an update daily, Conversion Calculator every 5 weeks. The most recent releases landed on September 18, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | SM Calculator | Conversion Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sm-calculator/id1663949657/reviews)** | [4.8 (157 ratings)](https://appshunter.io/ios/app/conversion-calculator-metric/id6468678523/reviews) |
| Number of ratings | 2 | **157** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 5 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 8 MB | 7 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Body Culture](https://appshunter.io/developer/910681467) | [Collins Cheruiyot](https://appshunter.io/developer/1579009978) |

## What reviewers say

### 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


### Conversion Calculator

[App page](https://appshunter.io/ios/app/conversion-calculator-metric/id6468678523)

Easily convert between metric and imperial units for weight, length, temperature, area, and time. This app offers precise, fast results with a clean interface, working offline for daily, travel, school, or work needs.

**Highlights:** Metric and imperial unit conversion, Weight, length, temperature, area, time, Offline functionality, Precise and fast results, Clean and minimal interface, Over 100 measurement types

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited access forever | $8.99 | one-time |


## Frequently asked questions

### Is SM Calculator free?

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

### Is Conversion Calculator free?

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

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

SM Calculator is rated higher. SM Calculator averages 5.0 out of 5 from 2 ratings, while Conversion Calculator averages 4.8 from 157 ratings.

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

Neither SM Calculator nor Conversion Calculator shows ads.

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

SM Calculator ships an update daily, and Conversion Calculator every 5 weeks. Most recently, SM Calculator was updated on September 18, 2026 and Conversion Calculator on September 22, 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.*