# PT100 Calculator vs Watch faces

The clearest difference is price: Watch faces at Free against PT100 Calculator's $2.99. Watch faces also leads on update cadence (every 9 days vs monthly) and iOS requirement (15.0 vs 17.0). PT100 Calculator's advantage is in-app purchases (none vs 3). On ads and device support there is nothing between them.

Watch faces is free to download; PT100 Calculator costs $2.99 up front. Watch faces sells 3 in-app purchases, starting at $1.99 per 7 days. PT100 Calculator asks for nothing beyond the download.

PT100 Calculator ships an update monthly, Watch faces every 9 days. The most recent releases landed on November 7, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | PT100 Calculator | Watch faces |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/watch-faces-amazfaces-lite/id6794642422/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 40 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [William Newcombe](https://appshunter.io/developer/1215031696) | [Stanislav Topanov](https://appshunter.io/developer/999046660) |

## What reviewers say

### PT100 Calculator

[App page](https://appshunter.io/ios/app/pt100-calculator/id1577277449)

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

**In-app purchases:** none


### Watch faces

[App page](https://appshunter.io/ios/app/watch-faces-amazfaces-lite/id6794642422)

Discover and install free watch faces for your Amazfit and Zepp OS smartwatch. Browse a wide variety of styles, preview designs, and easily install them with a QR code. Personalize your watch to match your mood and activities.

**Highlights:** Free watch face gallery, No account required, Easy QR code installation, Designed for Amazfit & Zepp OS, Preview before installing, Lightweight experience

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Ad-Free | $1.99 | per 7 days |
| Month Plus | $2.99 | per month |
| Year Plus | $24.99 | per year |


## Frequently asked questions

### Is PT100 Calculator free?

PT100 Calculator costs $2.99, with no in-app purchases.

### Is Watch faces free?

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

### Do PT100 Calculator or Watch faces have ads?

Neither PT100 Calculator nor Watch faces shows ads.

### Which is updated more often, PT100 Calculator or Watch faces?

PT100 Calculator ships an update monthly, and Watch faces every 9 days. Most recently, PT100 Calculator was updated on November 7, 2026 and Watch faces 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.*