# allTimeCalc vs Smart Unit Conversion

The clearest difference is price: Smart Unit Conversion at Free against allTimeCalc's $2.99. Smart Unit Conversion also leads on iOS requirement (13.4 vs 26.0). allTimeCalc's advantage is in-app purchases (none vs 1) and ads (none vs shown). On update cadence and device support there is nothing between them.

Smart Unit Conversion is free to download; allTimeCalc costs $2.99 up front. Smart Unit Conversion sells 1 in-app purchase, starting at $1.99 per year. allTimeCalc asks for nothing beyond the download.

allTimeCalc ships an update every 21 months, Smart Unit Conversion every 15 months. The most recent releases landed on October 4, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | allTimeCalc | Smart Unit Conversion |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 21 months | **Every 15 months** |
| Size | 6 MB | 41 MB |
| Requires iOS | 26.0 | **13.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Paulo Correia](https://appshunter.io/developer/1237073918) | [Yui Lau](https://appshunter.io/developer/1791465155) |

## What reviewers say

### allTimeCalc

[App page](https://appshunter.io/ios/app/alltimecalc/id1621535924)

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

**In-app purchases:** none


### Smart Unit Conversion

[App page](https://appshunter.io/ios/app/smart-unit-conversion/id1643381985)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Year | $1.99 | per year |


## Frequently asked questions

### Is allTimeCalc free?

allTimeCalc costs $2.99, with no in-app purchases.

### Is Smart Unit Conversion free?

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

### Do allTimeCalc or Smart Unit Conversion have ads?

Smart Unit Conversion shows ads; allTimeCalc does not.

### Which is updated more often, allTimeCalc or Smart Unit Conversion?

allTimeCalc ships an update every 21 months, and Smart Unit Conversion every 15 months. Most recently, allTimeCalc was updated on October 4, 2026 and Smart Unit Conversion on October 8, 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.*