# Smart Candle vs Convert Units Calculator

The clearest difference is ads: Smart Candle at none against Convert Units Calculator's shown. Smart Candle also leads on iOS requirement (13.0 vs 16.4). On price, update cadence, 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.

Smart Candle ships an update monthly, Convert Units Calculator every 2 months. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Smart Candle | Convert Units Calculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 2 months |
| Size | 47 MB | 49 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SHENZHEN QUANLIANGYU BIOTECHNOLOGY CO.,LTD](https://appshunter.io/developer/1330179432) | [Nelson Lai](https://appshunter.io/developer/1477911199) |

## What reviewers say

### Smart Candle

[App page](https://appshunter.io/ios/app/smart-candle/id6751098524)

**Features:** macOS Compatibility

**In-app purchases:** none


### Convert Units Calculator

[App page](https://appshunter.io/ios/app/convert-units-calculator/id6758808738)

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

**In-app purchases:** none


## Frequently asked questions

### Is Smart Candle free?

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

### Is Convert Units Calculator free?

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

### Do Smart Candle or Convert Units Calculator have ads?

Convert Units Calculator shows ads; Smart Candle does not.

### Which is updated more often, Smart Candle or Convert Units Calculator?

Smart Candle ships an update monthly, and Convert Units Calculator every 2 months. Most recently, Smart Candle was updated on October 25, 2026 and Convert Units Calculator on October 31, 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.*