Linkura vs S4DX Samples
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Linkura
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Oftentimes itβs hard deciding whether the body is in a state of stress or recovery. What we perceive as stress might not be physiological stress, and physiological stress might not be perceived as stress. The same goes for recovery. To gain full control of our stress, we need to measure and translate signals from the body. In Linkuraβs stress check, the signals from the body are weighed together with questionnaire responses regarding self-assessed stress. By doing so, we can determine your stress level. Your result shows you which parameters to work on depending on set goals. Linkuraβs stress check is like a health check, but in Linkuraβs check, there is no need for visits to a health center or appointments with doctors. We do not need any blood samples or block time in your calendar to do the stress check. The data we need is collected with ease using a small wearable ECG meter on a chest strap. The results can be found in the app whenever there is time. The stress check includes: - Stress level: Your resting HRV (heart rate variability) showing the balance between stress and recovery. Load graphs 24/7. - Sleep: You sleep time and load graphs during nights. - Physical activity: Your amount of pulse-raising movement divided into low-intensity and high-intensity physical activity. - Physical fitness: Your resting pulse. - Self-assessed symptoms of stress: Your risk of burnout measured with KEDS (Karolinska exhaustion disorder scale). The app also includes: - An exercise bank with breathing and meditation exercises. - Real-time displays of HRV and heart rate. - Tools for checking in wellbeing over time. Please note that usage of the app requires a valid license and a Linkura measuring device. Contact Linkura for more information!
S4DX Samples
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Human samples are registered with help of the app directly during blood collection. The lab order is displayed to inform phlebotomists about sample types, number of samples, and pre-analytical advice. The user is immediately alerted if there are missing samples. The recording of additional information on the patient and/or sample in the app can be configured.
Screenshots
Verdict
The clearest difference is update cadence: Linkura at every 2 weeks against S4DX Samples's every 3 months. Linkura also leads on iOS requirement (13.4 vs 15.5). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Linkura ships an update every 2 weeks, S4DX Samples every 3 months. The most recent releases landed on October 26, 2026 and October 29, 2026 respectively.
| Parameter | Linkura | S4DX Samples |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks β better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod β better | iPhone, iPod |
| Requires iOS | 13.4 β better | 15.5 |
| Further details β not scored | ||
| Size | 48 MB | 80 MB |
| Age rating | 4+ | 4+ |
| Developer | Linkura AB | S4DX GmbH |
In-app purchases
Linkura
No in-app purchases
S4DX Samples
No in-app purchases









