SickPredict™ vs SickDays
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SickPredict™
This app leverages data from your Apple Watch to predict potential health changes up to 72 hours in advance. It calculates a personalized 'SickNumber™' and tracks your health metrics over time, providing alerts for risk level changes. It is intended for general wellbeing and informational purposes only.
- Predicts health changes up to 72 hours in advance
- Calculates personalized SickNumber™
- Tracks health changes over time
- Provides periodic risk level alerts
- Integrates with Apple Health data
- Uses machine learning algorithms
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Requires an Apple watch and iPhone. Experience the future of personalized health! Based on tested scientific research and data from your Apple watch, the SickPredict™ App calculates, in real-time, your personalized SickNumber™ to help anticipate any upcoming changes in your health up to 72 hours in advance of experiencing any symptoms! Your personalized SickNumber™ is based on the specific health metrics gathered from your Apple watch. Key features: 1. Anticipates changes in your health up to 72 hours before you show symptoms! Research-tested, we can now predict oncoming illness with reasonable accuracy. Keep in mind, it is not perfect, but the scientific results have been conclusive in using certain data collected by your Apple watch to proactively identify potential changes in your health. 2. Track your health changes over time. Use this app to calculate your daily SickNumber™ and track your history. This app uses machine learning algorithms to track changes in your SickNumber™ over time. 3. Receive periodic alerts. The SickPredict™ app sends you daily notifications of your SickNumber™ and changes in your risk level. How It Works Over the past several years, research studies have been conducted involving more than 100,000 people wearing smart watches and the results were very positive, showing strong levels of accuracy in the ability to predict illness from health data that was recorded by the wearables. This app integrates with Apple Health and uses a multitude of data that is provided by your wearable everyday such as Active Energy, Body Temperature, Heart Rate, Heart Rate Variability, Oxygen Saturation, Resting Energy, Steps, Resting Heart Rate, Sleep Data and more. The SickPredict™ App calculates, in real-time, your personalized SickNumber™. The daily SickNumber™ ranges from 1-10 to help anticipate any upcoming changes in your health. Here are the SickNumber™ risk levels: o Low risk is 1-4 o Medium risk is 5-7 o Elevated risk is 8-10 Suggestions/Comments • Although it is not required to use your wearable at night, it is highly recommended. The results are significantly better if you consistently wear your watch at night and consistently throughout the day. • Remember, do not rely on the SickPredict™ App for medical advice or diagnosis. The App is not a replacement or substitute for professional medical care. Use the App for informational, general wellbeing purposes only. Always consult your health professionals if you have any health concerns. Subscriptions Payment will be charged to the credit card connected to your iTunes account after your trial period ends and when your subscription starts. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the trial period or current subscription period. The subscription options for the Basic Access subscription include either a $3.99/month monthly fee or $28.99/ year annual fee. Both include a free 1 week trial. Manage your subscription by going to your Account Settings on your iPhone. Additional Information: Visit www.SickPredictApp.com Terms of Use: Visit https://sickpredictapp.com/terms-of-use/
SickDays
Easily log your healthy and sick days to gain insights into your well-being. Track symptoms for colds, allergies, or migraines with daily reminders and intuitive features to make informed health decisions.
- Track healthy and sick days
- Log symptoms for various conditions
- Daily reminders
- Intuitive logging
- Health pattern insights
- Wellness monitoring
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SickDays is your personal health companion that helps you easily track your healthy and sick days. Whether you're fighting off a cold, experiencing seasonal allergies, or just want to monitor your daily well-being, SickDays provides a clear and simple way to log your symptoms, and stay on top of your health. With daily reminders and intuitive logging features, you'll gain valuable insights into patterns in your health, helping you make better decisions for your wellness. • Health correlations (Pro): See how sleep, steps, resting heart rate, and HRV compare on your sick days vs your baseline — powered by Apple Health, on-device only. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: SickPredict™ at 4.1 against SickDays's 3.3. SickPredict™ also leads on review sentiment (73% vs 33%) and ratings volume (30 vs 9). SickDays's advantage is monetization model (free with in-app purchases vs subscription). On price, update cadence, ads and in-app purchases 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. SickPredict™ sells 2 in-app purchases, starting at $3.99 per month and SickDays sells 2 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.
SickPredict™ holds the better App Store score, 4.1 against 3.3. Both are backed by a comparable volume of ratings — 30 and 9 respectively. Written reviews point the same way: 73% of SickPredict™'s written reviews are positive against 33% of SickDays's.
Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on July 5, 2026 and September 22, 2026 respectively.
| Parameter | SickPredict™ | SickDays |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (30 ratings) — better | 3.3 (9 ratings) |
| Positive reviews | 73.1% of reviews — better | 33.3% of reviews |
| Number of ratings | 30 — better | 9 |
| Update frequency | Every 2 months | Every 2 months |
| Ads | Yes | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Subscription | Free with in-app purchases — better |
| Devices | iPhone, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 58 MB | 24 MB |
| Age rating | 17+ | 4+ |
| Developer | Health Logic Global | Florian Schweizer |
Customer experience
SickPredict™
SickDays
In-app purchases
SickPredict™
- Basic Access7 Days trial$3.991 Month
- Basic Access7 Days trial$28.991 Year
SickDays
- Pro (Weekly)$0.997 Days
- Pro (Yearly)14 Days trial$19.991 Year









