# Smart Tools Pro HD vs Smart Unit Conversion

The clearest difference is price: Smart Unit Conversion at Free against Smart Tools Pro HD's $0.99. Smart Unit Conversion also leads on device support (3 vs 1) and iOS requirement (13.4 vs 17.0). Smart Tools Pro HD's advantage is in-app purchases (none vs 1) and ads (none vs shown). On update cadence there is nothing between them.

Smart Unit Conversion is free to download; Smart Tools Pro HD costs $0.99 up front. Smart Unit Conversion sells 1 in-app purchase, starting at $1.99 per year. Smart Tools Pro HD asks for nothing beyond the download.

Smart Tools Pro HD ships an update every 9 months, Smart Unit Conversion every 15 months. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Smart Tools Pro HD | Smart Unit Conversion |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/smart-tools-pro-hd/id764668765/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 9 months** | Every 15 months |
| Monetization | Paid | — |
| Size | 11 MB | 41 MB |
| Requires iOS | 17.0 | **13.4** |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Shajir Kalady](https://appshunter.io/developer/1673992247) | [Yui Lau](https://appshunter.io/developer/1791465155) |

## What reviewers say

### Smart Tools Pro HD

[App page](https://appshunter.io/ios/app/smart-tools-pro-hd/id764668765)

This app transforms your iPad into a comprehensive toolkit with over 30 measurement and utility functions. It offers tools like rulers, protractors, speedometers, flashlights, and QR code scanners, catering to various professional and personal needs.

**Highlights:** Ruler and protractor for precise measurements, AR-based distance and height measurement, Real-time speedometer with HUD mode, Flashlight with adjustable brightness, Digital compass with GPS integration, QR code scanner and generator, Spirit level with surface and edge modes

**Features:** macOS Compatibility

**In-app purchases:** none


### Smart Unit Conversion

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

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

**In-app purchases (1)**

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


## Frequently asked questions

### Is Smart Tools Pro HD free?

Smart Tools Pro HD costs $0.99, with no in-app purchases.

### Is Smart Unit Conversion free?

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

### Do Smart Tools Pro HD or Smart Unit Conversion have ads?

Smart Unit Conversion shows ads; Smart Tools Pro HD does not.

### Which is updated more often, Smart Tools Pro HD or Smart Unit Conversion?

Smart Tools Pro HD ships an update every 9 months, and Smart Unit Conversion every 15 months. Most recently, Smart Tools Pro HD was updated on October 29, 2026 and Smart Unit Conversion on October 27, 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.*