# Diamond tester º vs RBX Guess

The clearest difference is rating: RBX Guess at 4.5 against Diamond tester º's 3.8. RBX Guess also leads on in-app purchases (none vs 2) and ratings volume (12K vs 4). Diamond tester º's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Diamond tester º sells 2 in-app purchases, starting at $2.99 per 7 days. RBX Guess asks for nothing beyond the download.

RBX Guess holds the better App Store score, 4.5 against 3.8. That said, the two scores are not equally well evidenced: RBX Guess has 12K ratings behind it against 4, so its average is the more settled of the two.

Diamond tester º ships an update fortnightly, RBX Guess weekly. The most recent releases landed on November 5, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Diamond tester º | RBX Guess |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (4 ratings)](https://appshunter.io/ios/app/diamond-tester/id6760787913/reviews) | **[4.5 (12K ratings)](https://appshunter.io/ios/app/rbx-guess/id6761893296/reviews)** |
| Number of ratings | 4 | **12K** |
| Positive reviews | — | 56.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 65 MB | 46 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Alberto Soto](https://appshunter.io/developer/1702225144) | [LYDIA LLC](https://appshunter.io/developer/1891966108) |

## What reviewers say

### Diamond tester º

[App page](https://appshunter.io/ios/app/diamond-tester/id6760787913)

Quickly assess if a stone might be a real diamond using your device's sensors. Get instant feedback without needing tools or experience, ideal for buyers, sellers, or the simply curious.

**Highlights:** Test diamonds in seconds, Simple and intuitive interface, No technical knowledge needed, Uses device sensors for analysis, Fast and clear results, No account or data collection required

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Week subscription | $2.99 | per 7 days |
| Lifetime | $19.99 | one-time |


### RBX Guess

[App page](https://appshunter.io/ios/app/rbx-guess/id6761893296)

Test your knowledge of popular games by matching icons to their correct names within a time limit. Progress through levels by answering questions correctly, with a variety of games featured across multiple stages. Enjoy a visually engaging experience with smooth animations and feedback.

**Highlights:** Match game icons to names, 30-second timer per question, Level progression system, 50 games across 10 levels, Visually engaging animations, Supports 49 languages

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

**In-app purchases:** none


## Frequently asked questions

### Is Diamond tester º free?

Diamond tester º is free to download, with in-app purchases available.

### Is RBX Guess free?

RBX Guess is free to download, with no in-app purchases.

### Which has better reviews, Diamond tester º or RBX Guess?

RBX Guess is rated higher. Diamond tester º averages 3.8 out of 5 from 4 ratings, while RBX Guess averages 4.5 from 12K ratings.

### Do Diamond tester º or RBX Guess have ads?

RBX Guess shows ads; Diamond tester º does not.

### Which is updated more often, Diamond tester º or RBX Guess?

Diamond tester º ships an update fortnightly, and RBX Guess weekly. Most recently, Diamond tester º was updated on November 5, 2026 and RBX Guess on November 8, 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.*