# SickPredict™ vs SickDays

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.

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.

## The numbers

| Metric | SickPredict™ | SickDays |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (30 ratings)](https://appshunter.io/ios/app/sickpredict/id1531998468/reviews)** | [3.3 (9 ratings)](https://appshunter.io/ios/app/sickdays-headache-tracker/id6670275544/reviews) |
| Number of ratings | **30** | 9 |
| Positive reviews | **73.1% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Subscription | **Free with in-app purchases** |
| Size | 58 MB | 24 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Health Logic Global](https://appshunter.io/developer/1531998470) | [Florian Schweizer](https://appshunter.io/developer/1142213239) |

## What reviewers say

### SickPredict™

[App page](https://appshunter.io/ios/app/sickpredict/id1531998468)

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.

**Highlights:** 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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Access | $3.99 | per month |
| Basic Access | $28.99 | per year |


### SickDays

[App page](https://appshunter.io/ios/app/sickdays-headache-tracker/id6670275544)

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.

**Highlights:** Track healthy and sick days, Log symptoms for various conditions, Daily reminders, Intuitive logging, Health pattern insights, Wellness monitoring

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Weekly) | $0.99 | per 7 days |
| Pro (Yearly) | $19.99 | per year |


## Frequently asked questions

### Is SickPredict™ free?

SickPredict™ is free to download, with in-app purchases available.

### Is SickDays free?

SickDays is free to download, with in-app purchases available.

### Which has better reviews, SickPredict™ or SickDays?

SickPredict™ is rated higher. SickPredict™ averages 4.1 out of 5 from 30 ratings, while SickDays averages 3.3 from 9 ratings.

### Do SickPredict™ or SickDays have ads?

Both SickPredict™ and SickDays show ads.

### Which is updated more often, SickPredict™ or SickDays?

SickPredict™ ships an update every 2 months, and SickDays every 2 months. Most recently, SickPredict™ was updated on July 5, 2026 and SickDays on September 22, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*