# sensitivity.io vs Retinal

The clearest difference is update cadence: Retinal at fortnightly against sensitivity.io's every 15 months. sensitivity.io's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 17.0). On price, ads and in-app purchases there is nothing between them.

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

sensitivity.io ships an update every 15 months, Retinal fortnightly. The most recent releases landed on October 5, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | sensitivity.io | Retinal |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Fortnightly** |
| Size | 18 MB | 1 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [CoSoSys](https://appshunter.io/developer/379244833) | [Nico Rohrbach](https://appshunter.io/developer/662717596) |

## What reviewers say

### sensitivity.io

[App page](https://appshunter.io/ios/app/sensitivityio/id1211192287)

**In-app purchases:** none


### Retinal

[App page](https://appshunter.io/ios/app/retinal/id1564557619)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is sensitivity.io free?

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

### Is Retinal free?

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

### Do sensitivity.io or Retinal have ads?

Neither sensitivity.io nor Retinal shows ads.

### Which is updated more often, sensitivity.io or Retinal?

sensitivity.io ships an update every 15 months, and Retinal fortnightly. Most recently, sensitivity.io was updated on October 5, 2026 and Retinal on October 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*