# Vampire Mask vs Unit Converter SDG

The clearest difference is rating: Unit Converter SDG at 4.5 against Vampire Mask's 4.0. Unit Converter SDG also leads on ratings volume (13 vs 1) and device support (3 vs 1). Vampire Mask's advantage is update cadence (every 2 weeks vs every 12 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Unit Converter SDG holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Unit Converter SDG has 13 ratings behind it against 1, so its average is the more settled of the two.

Vampire Mask ships an update every 2 weeks, Unit Converter SDG every 12 months. The most recent releases landed on October 12, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Vampire Mask | Unit Converter SDG |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/vampire-mask/id6739823806/reviews) | **[4.5 (13 ratings)](https://appshunter.io/ios/app/unit-converter-sdg/id6741796782/reviews)** |
| Number of ratings | 1 | **13** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 2 weeks** | Every 12 months |
| Monetization | Ad-supported | Ad-supported |
| Size | 35 MB | 12 MB |
| Requires iOS | 17.7.2 | **11.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [SDG CODE DOO NIS](https://appshunter.io/developer/1343251532) |

## What reviewers say

### Vampire Mask

[App page](https://appshunter.io/ios/app/vampire-mask/id6739823806)

Add realistic fangs to your photos with this utility app. Easily overlay fangs onto any face image to create fun and spooky edits. Perfect for Halloween or just for a laugh.

**Highlights:** Overlay fangs on photos, Realistic fang effects, Easy-to-use interface, Suitable for all ages

**Features:** macOS Compatibility

**In-app purchases:** none


### Unit Converter SDG

[App page](https://appshunter.io/ios/app/unit-converter-sdg/id6741796782)

Easily convert between various units of measurement with this straightforward tool. Quickly and accurately switch from one unit to another for everyday tasks.

**Highlights:** Easy unit conversion, Accurate measurements, Simple interface, Quick switching between units

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Vampire Mask free?

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

### Is Unit Converter SDG free?

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

### Which has better reviews, Vampire Mask or Unit Converter SDG?

Unit Converter SDG is rated higher. Vampire Mask averages 4.0 out of 5 from 1 ratings, while Unit Converter SDG averages 4.5 from 13 ratings.

### Do Vampire Mask or Unit Converter SDG have ads?

Both Vampire Mask and Unit Converter SDG show ads.

### Which is updated more often, Vampire Mask or Unit Converter SDG?

Vampire Mask ships an update every 2 weeks, and Unit Converter SDG every 12 months. Most recently, Vampire Mask was updated on October 12, 2026 and Unit Converter SDG on October 24, 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.*