# Smart Candle vs Unitio

The clearest difference is in-app purchases: Smart Candle at none against Unitio's 3. Smart Candle also leads on ads (none vs shown). Unitio's advantage is update cadence (every 5 days vs every 5 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Unitio sells 3 in-app purchases, starting at $1.99 per 7 days. Smart Candle asks for nothing beyond the download.

Smart Candle ships an update every 5 weeks, Unitio every 5 days. The most recent releases landed on November 8, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Smart Candle | Unitio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 5 days** |
| Size | 48 MB | 44 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [深圳市全粮愈生物科技有限公司](https://appshunter.io/developer/1330179432) | [Kin Man Leung](https://appshunter.io/developer/1716597027) |

## What reviewers say

### Smart Candle

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

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

**In-app purchases:** none


### Unitio

[App page](https://appshunter.io/ios/app/unitio-unit-converter/id6759262265)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UnitioPro | $1.99 | per 7 days |
| UnitioPro | $3.99 | per month |
| UnitioPro | $24.99 | per year |


## Frequently asked questions

### Is Smart Candle free?

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

### Is Unitio free?

Unitio is free to download, with in-app purchases available.

### Do Smart Candle or Unitio have ads?

Unitio shows ads; Smart Candle does not.

### Which is updated more often, Smart Candle or Unitio?

Smart Candle ships an update every 5 weeks, and Unitio every 5 days. Most recently, Smart Candle was updated on November 8, 2026 and Unitio on November 9, 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.*