Comparison

EndureIndex vs CardioWatch Pro

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

Head to head
About

EndureIndex

Features
Read full description

Ready to train — or is recovery the smarter choice today? EndureIndex helps you better understand your daily readiness and plan your training more consciously. The app uses data from Apple Health and turns it into clear signals for readiness, training load, recovery and endurance development. This helps you see more clearly whether your body is ready for training, whether light movement would be a better option, or whether you should give your recovery more space. What EndureIndex offers: • Readiness Score for your current daily condition • Endurance Score for your endurance development • Training load, recovery and trends at a glance • Analysis of HRV, resting heart rate, sleep, steps and workouts • Weather and environmental load, where available • Clear insights instead of raw data only • Goal focus for fitness, fat loss, weight maintenance, more energy, consistency and movement • Apple Watch app and widgets • Support for English and German Why EndureIndex? Not every day is the same. Sometimes your body is ready for an intense workout, sometimes light movement or recovery is the smarter choice. EndureIndex helps you better understand important signals from Apple Health and use them to make more conscious decisions about training and recovery. EndureIndex Pro With EndureIndex Pro, you get advanced analyses, longer trend histories, deeper insights into training load and recovery, goal evaluations, correlations and additional premium features. Privacy EndureIndex uses Apple Health data only with your permission. Your data stays on your device and is not used for tracking or advertising. Location data is only used with your permission to include weather-related load factors. Disclaimer EndureIndex is not a medical app and does not replace medical advice. The analyses are intended for personal orientation around training, recovery and fitness. Privacy Policy: https://danilo-krautz.de/privacy-endureindex/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

CardioWatch Pro

This app analyzes your Apple Watch data to provide daily stress insights and heart rhythm information. It identifies patterns and trends in your body's signals, comparing them to your personal baseline for a unique perspective on your well-being.

Highlights
  • Daily stress state and timeline
  • Heart rate variability analysis
  • Morning recovery score
  • ECG waveform processing
  • Sleep and activity pattern correlation
  • Long-term health trend tracking
Features
Read full description

CardioWatch does two things. Every day, it tells you whether your body is tense or relaxed. And it puts to work the data your Apple Watch already records — data that mostly sits unread in the Health app — finding how it connects and where it's heading. Every comparison is against your own usual, not population averages. 1. YOUR DAILY STRESS STATE - Today in one sentence: where you are now, when today ran tightest, and whether it has eased since - Stress timeline: the whole day on a 5-level scale, based on subtle changes in the time between heartbeats (heart rate variability), compared with your personal 30-day baseline - Morning recovery: a recovery score for this morning, drawn from your sleep and overnight data - Weekly recap: which days ran tight and which were relaxed, with a summary every Sunday evening 2. MORE FROM YOUR WATCH DATA: PATTERNS AND TRENDS Your Apple Watch records far more than steps: the time between heartbeats, heart rate, resting and walking heart rate; sleep duration and stages, breathing rate and wrist temperature while you sleep; steps, exercise minutes, stand time, active energy, workouts and VO₂ max. CardioWatch reads them together: - Relationships: whether a short night, a late bedtime, a big workout the day before or a day of sitting goes along with how you are afterwards, and by how much - Rhythms: which weekday tends to run tight, how much later your weekends run, how regular your days are - Bounce-back: how long it usually takes you to recover after a low day or a short night - Body signals: resting heart rate, walking heart rate, sleeping breathing rate and wrist temperature, each compared only with your own usual, showing what differs from normal - Long-term trends: 7-, 30- and 90-day look-backs; how your heart rate at the same walking pace has changed; the direction of your cardio fitness (VO₂ max) and post-workout heart-rate recovery Analysis starts after at least 7 days of data, and differences too small to matter are left out. These are statistical relationships in your own data — not cause and effect, and not a health assessment. On nights you sleep without your watch, sleep is estimated from gaps in heart rate and steps, and clearly marked as an estimate. 3. ECG, RIGHT BESIDE YOUR STRESS Every ECG you record on your Apple Watch is processed on your iPhone: the full waveform, QTc, PR and QRS values with reference ranges, signal features marked on the trace, and the recording placed on that day's stress timeline so you can see the day around it. All values are for reference only — have your doctor interpret them. FREE FEATURES - Daily stress timeline against your own baseline - ECG waveforms with QTc / PR / QRS values, reference ranges and signal-feature labels - Symptom tagging after each recording - 7-day trends, weekly recap and recording streak - Home and lock screen widgets PRO FEATURES (Subscription) - How sleep, exercise and activity relate to your stress - 30- and 90-day look-backs: routine, bounce-back after a low day, heart rate at the same walking pace, ECG recordings on your stress curve - Stress calendar beyond the last 7 days - PDF summary for your doctor PRIVACY FIRST All data stays on your device. No cloud. No accounts. No tracking. IMPORTANT CardioWatch is not a medical device and does not provide medical diagnosis. All measurements are for reference only. If you experience chest pain, severe dizziness, or difficulty breathing, call emergency services immediately. Requires Apple Watch Series 4 or later with ECG capability. Terms of Use: https://zenmindstudio.com/cardiowatch-terms Privacy Policy: https://zenmindstudio.com/cardiowatch-privacy

Screenshots

EndureIndex4 screens
CardioWatch Pro4 screens

Verdict

The call

The clearest difference is update cadence: CardioWatch Pro at every 6 days against EndureIndex's every 3 weeks. CardioWatch Pro also leads on iOS requirement (17.0 vs 26.0). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. EndureIndex sells 2 in-app purchases, starting at $1.99 per month and CardioWatch Pro sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

EndureIndex ships an update every 3 weeks, CardioWatch Pro every 6 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 7 level
EndureIndex versus CardioWatch Pro: the parameters behind the verdict, then further details
ParameterEndureIndexCardioWatch Pro
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 3 weeksEvery 6 days — better
AdsNoNo
In-app purchasesYesYes
Monetization—Freemium
DevicesiPhone, Apple WatchiPhone, iPad, Apple Watch — better
Requires iOS26.017.0 — better
Further details — not scored
Size8 MB30 MB
Age rating4+12+
DeveloperDanilo KrautzShanghai Zen Mind Information Technology Co., Ltd.

In-app purchases

2 purchases

EndureIndex

Subscriptions2
  • EndureIndex Pro Monthly$1.991 Month
  • EndureIndex Pro Yearly7 Days trial$14.991 Year
3 purchases

CardioWatch Pro

Subscriptions2
  • CardioWatch Pro$9.991 Month
  • CardioWatch Pro$29.991 Year
One-time1
  • CardioWatch Pro Lifetime$49.99

Questions

Is EndureIndex free?
EndureIndex is free to download, with in-app purchases available.
Is CardioWatch Pro free?
CardioWatch Pro is free to download, with in-app purchases available.
Do EndureIndex or CardioWatch Pro have ads?
Neither EndureIndex nor CardioWatch Pro shows ads.
Which is updated more often, EndureIndex or CardioWatch Pro?
EndureIndex ships an update every 3 weeks, and CardioWatch Pro every 6 days. Most recently, EndureIndex was updated on October 24, 2026 and CardioWatch Pro on October 25, 2026.

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