# Unitify vs Smart Unit Conversion

The clearest difference is in-app purchases: Unitify at none against Smart Unit Conversion's 1. Unitify also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 15 months). Smart Unit Conversion's advantage is iOS requirement (13.4 vs 15.0). On price and device support there is nothing between them.

Both are free to download. Smart Unit Conversion sells 1 in-app purchase, starting at $1.99 per year. Unitify asks for nothing beyond the download.

Unitify ships an update every 2 weeks, Smart Unit Conversion every 15 months. The most recent releases landed on September 11, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Unitify | Smart Unit Conversion |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 weeks** | Every 15 months |
| Size | 5 MB | 41 MB |
| Requires iOS | 15.0 | **13.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Marwa Abou Niaaj](https://appshunter.io/developer/1407184850) | [Yui Lau](https://appshunter.io/developer/1791465155) |

## What reviewers say

### Unitify

[App page](https://appshunter.io/ios/app/unitify-unit-conversion/id1641864451)

**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 Unitify free?

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

### Is Smart Unit Conversion free?

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

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

Smart Unit Conversion shows ads; Unitify does not.

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

Unitify ships an update every 2 weeks, and Smart Unit Conversion every 15 months. Most recently, Unitify was updated on September 11, 2026 and Smart Unit Conversion 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.*