CPR Responder Pro vs Flex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CPR Responder Pro
Read full descriptionHide full description
CPR Responder Pro: Master Your Rhythm In the heat of a Code Blue, adrenaline takes over. Even experienced professionals struggle to maintain the perfect 100-120 compressions per minute (CPM) without a guide. You can't always see the monitor, and you can't always hear a click track over the noise. CPR Responder Pro solves the "Unknown Rate" problem by turning your Apple Watch into a silent, steady guide. THE CORE SOLUTION: • Haptic Metronome (Feel the Beat): Your Apple Watch vibrates sharply at 110 BPM. This tactile feedback "taps" your wrist, helping you lock into the correct rhythm instinctively—even in a noisy emergency room where audio cues are drowned out. • Audio & Visual Cues: Need more than vibration? Turn on the high-contrast visual flasher or the audio click track to synchronize the entire team to the same perfect pace. • "Drift" Alerts: We don't realize when we speed up or slow down. The app monitors your actual motion. If you drift below 100 CPM or above 120 CPM, the Watch alerts you immediately to correct your speed. ADDITIONAL FEATURES: • Code Leader Dashboard (iPhone): While you focus on compressions, the Team Leader can watch your live performance on the iPhone. See large, clear metrics for your current Rate and Rescuer Heart Rate (to monitor fatigue). • Estimated Depth (Beta): Using the accelerometer, the app provides a real-time estimate of your compression depth trend, helping you spot shallow compressions before they become a habit. • Session Logs: Automatically save the duration and average rate of every code for debriefing and training review. DISCLAIMER: CPR Responder Pro is a training and tracking utility for medical professionals. It is not a diagnostic device. Always follow standard ACLS/BLS protocols and rely on clinical judgment.
Flex
Effortlessly track your strength training progress, build personalized workout routines, and visualize your lifts with an intelligent plate calculator. Syncs data across devices using iCloud for seamless access and prioritizes privacy with Sign in with Apple.
- Effortless workout tracking
- Personalized workout templates
- Customizable workout folders
- Smart Plate Calculator
- Cross-device iCloud sync
- Privacy-focused with Sign in with Apple
Read full descriptionHide full description
Flex is the ultimate companion for your strength training journey. Whether you're a powerlifter, bodybuilder, or just getting started in the gym, Flex helps you track your progress, build strength, and achieve your fitness goals with simplicity and precision. Experience effortless workout tracking designed to keep you focused on your lift, not your phone. You can build personalized workout templates for any routine and organize them into custom folders to keep your training schedule clean and accessible. With the built-in Smart Plate Calculator, you never have to do gym math again.... Flex automatically visualizes how to load the bar for your specific lifts. Your workouts go where you go. Flex seamlessly syncs your data across all your devices using iCloud, so your history is always up to date. Designed with privacy in mind, Flex uses Sign in with Apple and iCloud to ensure your health data remains secure without third-party accounts. Build consistency and see results. Download Flex today and make every rep count. Flex is designed and built by two fitness freaks, Ashton Krstolic and Kevin Brown. Every feature exists because we needed it at the rack. Questions or ideas? Visit our support page — we read every message.
Screenshots
Verdict
The clearest difference is iOS requirement: Flex at 18.0 against CPR Responder Pro's 26.2. On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | CPR Responder Pro | Flex |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (7 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 7 — better |
| Update frequency | — | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPad |
| Requires iOS | 26.2 | 18.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Oscar Yasser Pena Zapata | KEVIN BROWN |
In-app purchases
CPR Responder Pro
No in-app purchases
Flex
No in-app purchases





