# HTMLViewer Pro+ vs Rock Crystal Gem Identifier

The clearest difference is price: Rock Crystal Gem Identifier at Free against HTMLViewer Pro+'s $2.99. HTMLViewer Pro+'s advantage is in-app purchases (none vs 2) and iOS requirement (16.6 vs 26.0). On ads and device support there is nothing between them.

Rock Crystal Gem Identifier is free to download; HTMLViewer Pro+ costs $2.99 up front. Rock Crystal Gem Identifier sells 2 in-app purchases, starting at $2.99 per 7 days. HTMLViewer Pro+ asks for nothing beyond the download.

## The numbers

| Metric | HTMLViewer Pro+ | Rock Crystal Gem Identifier |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rock-crystal-gem-identifier/id6754856661/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 7 months |
| Monetization | — | Freemium |
| Size | 3 MB | 26 MB |
| Requires iOS | **16.6** | 26.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [倩 罗](https://appshunter.io/developer/1653510118) | [Streamlined Studios](https://appshunter.io/developer/1802378603) |

## What reviewers say

### HTMLViewer Pro+

[App page](https://appshunter.io/ios/app/htmlviewer-pro-plus/id6746694144)

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

**In-app purchases:** none


### Rock Crystal Gem Identifier

[App page](https://appshunter.io/ios/app/rock-crystal-gem-identifier/id6754856661)

Instantly identify rocks, crystals, and gemstones using AI. Snap a photo to get details on name, properties, and estimated value. Chat with an AI geologist for insights on origins and care, with all data saved privately on your device.

**Highlights:** AI Rock & Crystal Identification, Properties & Formation Details, Estimated Value with Reasoning, AI Geologist Chat, Private On-Device History, Simple and Fast Interface

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| Premium Yearly | $29.99 | per year |


## Frequently asked questions

### Is HTMLViewer Pro+ free?

HTMLViewer Pro+ costs $2.99, with no in-app purchases.

### Is Rock Crystal Gem Identifier free?

Rock Crystal Gem Identifier is free to download, with in-app purchases available.

### Do HTMLViewer Pro+ or Rock Crystal Gem Identifier have ads?

Neither HTMLViewer Pro+ nor Rock Crystal Gem Identifier shows ads.

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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.*