# RBCDetector vs What They See

The clearest difference is in-app purchases: RBCDetector at none against What They See's 12. RBCDetector also leads on iOS requirement (13.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. What They See sells 12 one-off in-app purchases. RBCDetector asks for nothing beyond the download.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 10, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | RBCDetector | What They See |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (39 ratings)](https://appshunter.io/ios/app/what-they-see/id6755517347/reviews)** |
| Number of ratings | — | **39** |
| Positive reviews | — | 37.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | — | Free with in-app purchases |
| Size | 27 MB | 85 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Korranat Naruenatthanaset](https://appshunter.io/developer/1294347753) | [Special Glasses LLC](https://appshunter.io/developer/1854349802) |

## What reviewers say

### RBCDetector

[App page](https://appshunter.io/ios/app/rbcdetector/id1294347754)

**Features:** macOS Compatibility

**In-app purchases:** none


### What They See

[App page](https://appshunter.io/ios/app/what-they-see/id6755517347)

This app simulates various vision conditions and color blindness in real-time using your device's camera. Explore how different visual impairments and animal vision affect perception, with educational guides and sharing capabilities.

**Highlights:** Real-time vision condition simulation, Colorblindness simulation, Animal vision simulation, Dyslexia text transformation, In-depth educational guides, Photo and video capture with simulation, Sharing capabilities

**Features:** Family Sharing

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Astigmatism | $1.99 | one-time |
| Cataracts | $1.99 | one-time |
| Protanopia | $1.99 | one-time |
| Tritanopia | $1.99 | one-time |
| Keratoconus | $2.99 | one-time |
| Baby Vision | $2.99 | one-time |
| All Color Blindness | $3.99 | one-time |
| All Dyslexia Simulations | $4.99 | one-time |
| All Animal Vision | $7.99 | one-time |
| All Vision Impairments | $12.99 | one-time |
| Unlock Everything | $14.99 | one-time |
| Unlock Everything | $24.99 | one-time |


## Frequently asked questions

### Is RBCDetector free?

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

### Is What They See free?

What They See is free to download, with in-app purchases available.

### Do RBCDetector or What They See have ads?

Neither RBCDetector nor What They See shows ads.

### Which is updated more often, RBCDetector or What They See?

RBCDetector ships an update fortnightly, and What They See fortnightly. Most recently, RBCDetector was updated on October 10, 2026 and What They See on October 25, 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.*