TrueZone vs EndureIndex
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
TrueZone
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The future of fitness testing. TrueZone offers quick-and-easy, gold-standard fitness testing for coaches or individuals, requiring only a heart rate monitor.
EndureIndex
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Ready to train โ 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: โข Readiness Score for your current daily condition โข Endurance Score for your endurance development โข Training load, recovery and trends at a glance โข Analysis of HRV, resting heart rate, sleep, steps and workouts โข Weather and environmental load, where available โข Clear insights instead of raw data only โข Goal focus for fitness, fat loss, weight maintenance, more energy, consistency and movement โข Apple Watch app and widgets โข 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/
Screenshots
Verdict
The clearest difference is iOS requirement: TrueZone at 14.0 against EndureIndex's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. TrueZone sells 2 one-off in-app purchases and EndureIndex sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 6, 2026 and October 3, 2026 respectively.
| Parameter | TrueZone | EndureIndex |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod โ better | iPhone, Apple Watch |
| Requires iOS | 14.0 โ better | 26.0 |
| Further details โ not scored | ||
| Size | 72 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Driftline ehf. | Danilo Krautz |
In-app purchases
TrueZone
- Heart rate analysis$5.99
- 10 fitness tests$49.99
EndureIndex
- EndureIndex Pro Monthly$1.991 Month
- EndureIndex Pro Yearly7 Days trial$14.991 Year









