Comparison

REACT Study vs AlertFriends App

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

REACT Study

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
Read full description

REACT (Early Cure of Atherosclerosis) is an innovative app designed to support an international research initiative aimed at preventing cardiovascular diseases through the early detection of atherosclerosis. About the study: REACT focuses on identifying early risk factors for atherosclerosis, long before severe symptoms appear. Your contribution helps us develop personalized detection and treatment strategies to improve global health. Download REACT and be part of the future of cardiovascular prevention.

About

AlertFriends App

Read full description

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://alertfriends.app/privacy A sudden illness. A fall. And no one at home. If something happened and you couldn't call for help, how long would it take for someone to notice? AlertFriends is a personal safety app for people who live alone, travel solo or spend long periods on their own. The app uses scheduled activity check-ins on your phone. If it can't confirm you're okay, it sends you a notification. If you still don't respond, AlertFriends notifies the trusted contacts you've chosen. No wristbands, smartwatches or extra devices. No constant tracking by family or friends. You decide who gets notified and when your check-ins take place. With Full Protection, you can schedule more frequent check-ins and use additional ways to notify your trusted contacts. Try Full Protection free for 7 days. Keep your independence, with the reassurance that someone can be informed if you don't respond. **Live independently. Stay connected. Feel protected.** AlertFriends does not detect falls or loss of consciousness and is not a substitute for emergency services. Alerts depend on scheduled checks, connectivity and required permissions.

Screenshots

REACT Study4 screens
AlertFriends App4 screens

Verdict

The call

The clearest difference is in-app purchases: REACT Study at none against AlertFriends App's 3. REACT Study also leads on update cadence (every 3 weeks vs every 2 months) and device support (3 vs 1). On price and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. AlertFriends App sells 3 in-app purchases, starting at $5.59 per month. REACT Study asks for nothing beyond the download.

UpkeepUpdate frequency

REACT Study ships an update every 3 weeks, AlertFriends App every 2 months. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

Scorecard4 real differences · 5 level
REACT Study versus AlertFriends App: the parameters behind the verdict, then further details
ParameterREACT StudyAlertFriends App
PriceFreeFree
Rating4.0 (4 ratings) — better—
Number of ratings4 — better—
Update frequencyEvery 3 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better26.0
Further details — not scored
Size34 MB93 MB
Age rating4+4+
DeveloperCentro Nacional de Investigaciones Cardiovasculares Carlos III (F.S.P.)AlertFriends

In-app purchases

None

REACT Study

No in-app purchases

3 purchases

AlertFriends App

Subscriptions3
  • Alert Friends$5.591 Month
  • Protección Total7 Days trial$5.991 Month
  • Protección Total$23.901 Month

Questions

Is REACT Study free?
REACT Study is free to download, with no in-app purchases.
Is AlertFriends App free?
AlertFriends App is free to download, with in-app purchases available.
Do REACT Study or AlertFriends App have ads?
Neither REACT Study nor AlertFriends App shows ads.
Which is updated more often, REACT Study or AlertFriends App?
REACT Study ships an update every 3 weeks, and AlertFriends App every 2 months. Most recently, REACT Study was updated on October 30, 2026 and AlertFriends App on November 5, 2026.

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