# HF Smart Pro vs Universal Unit Converter!

The clearest difference is ads: HF Smart Pro at none against Universal Unit Converter!'s shown. HF Smart Pro also leads on iOS requirement (12.0 vs 15.0). Universal Unit Converter!'s advantage is update cadence (weekly vs every 6 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

HF Smart Pro ships an update every 6 months, Universal Unit Converter! weekly. The most recent releases landed on September 22, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | HF Smart Pro | Universal Unit Converter! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.5 (13 ratings)](https://appshunter.io/ios/app/hf-smart-pro/id6473008782/reviews)** | — |
| Number of ratings | **13** | — |
| Positive reviews | 18.9% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | Free | — |
| Size | 24 MB | 41 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [鉴深 徐](https://appshunter.io/developer/1649273564) | [Taek Oh](https://appshunter.io/developer/1616205954) |

## What reviewers say

### HF Smart Pro

[App page](https://appshunter.io/ios/app/hf-smart-pro/id6473008782)

Control smart lights with customizable color changes and timing functions. Adjust light environments directly through mode control, altering color based on intensity, refraction, and opacity.

**Highlights:** Change light colors, Timing mode for smart lights, Timing switch for light control, Mode control for light environments, Adjust color by intensity, refraction, opacity

**Features:** macOS Compatibility

**In-app purchases:** none


### Universal Unit Converter!

[App page](https://appshunter.io/ios/app/universal-unit-converter/id6785926049)

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

**In-app purchases:** none


## Frequently asked questions

### Is HF Smart Pro free?

HF Smart Pro is free to download, with no in-app purchases.

### Is Universal Unit Converter! free?

Universal Unit Converter! is free to download, with no in-app purchases.

### Do HF Smart Pro or Universal Unit Converter! have ads?

Universal Unit Converter! shows ads; HF Smart Pro does not.

### Which is updated more often, HF Smart Pro or Universal Unit Converter!?

HF Smart Pro ships an update every 6 months, and Universal Unit Converter! weekly. Most recently, HF Smart Pro was updated on September 22, 2026 and Universal Unit Converter! on September 16, 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.*