# Centros NAILS vs REACT Study

The clearest difference is update cadence: REACT Study at every 3 weeks against Centros NAILS's every 14 months. REACT Study also leads on device support. On price, in-app purchases and iOS requirement there is nothing between them.

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

Centros NAILS ships an update every 14 months, REACT Study every 3 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Centros NAILS | REACT Study |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (4 ratings)](https://appshunter.io/ios/app/react-study/id6738690719/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | Every 14 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 59 MB | 34 MB |
| Requires iOS | **14.0** | 15.6 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Rosario Montoro](https://appshunter.io/developer/1566613342) | [Centro Nacional de Investigaciones Cardiovasculares Carlos III (F.S.P.)](https://appshunter.io/developer/1463033570) |

## What reviewers say

### Centros NAILS

[App page](https://appshunter.io/ios/app/centros-nails/id1566613340)

**In-app purchases:** none


### REACT Study

[App page](https://appshunter.io/ios/app/react-study/id6738690719)

This app supports an international research initiative focused on preventing cardiovascular diseases by detecting atherosclerosis early. Contribute to personalized detection and treatment strategies to improve global health outcomes.

**Highlights:** Supports international research initiative, Focuses on early atherosclerosis detection, Contributes to personalized treatment strategies, Aims to prevent cardiovascular diseases, Facilitates global health improvement

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

**In-app purchases:** none


## Frequently asked questions

### Is Centros NAILS free?

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

### Is REACT Study free?

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

### Which is updated more often, Centros NAILS or REACT Study?

Centros NAILS ships an update every 14 months, and REACT Study every 3 weeks. Most recently, Centros NAILS was updated on November 3, 2026 and REACT Study on October 30, 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.*