# Four Days vs Barometric Headache Forecast

The clearest difference is review sentiment: Barometric Headache Forecast at 100% against Four Days's 44%. Barometric Headache Forecast also leads on price (Free vs $1.99) and rating (4.3 vs 2.6). Four Days's advantage is ads (none vs shown) and iOS requirement (13.4 vs 15.0). On ratings volume, in-app purchases and device support there is nothing between them.

Barometric Headache Forecast is free to download; Four Days costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Barometric Headache Forecast holds the better App Store score, 4.3 against 2.6. Both are backed by a comparable volume of ratings — 8 and 3 respectively. Written reviews point the same way: 44% of Four Days's written reviews are positive against 100% of Barometric Headache Forecast's.

Four Days ships an update every 4 months, Barometric Headache Forecast every 4 weeks. The most recent releases landed on November 3, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Four Days | Barometric Headache Forecast |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [2.6 (8 ratings)](https://appshunter.io/ios/app/four-days/id1467531634/reviews) | **[4.3 (3 ratings)](https://appshunter.io/ios/app/barometric-headache-forecast/id6775428368/reviews)** |
| Number of ratings | **8** | 3 |
| Positive reviews | 44.4% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 4 weeks** |
| Monetization | Paid | **Ad-supported** |
| Size | 23 MB | 26 MB |
| Requires iOS | **13.4** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Sergio Gutierrez Mota](https://appshunter.io/developer/1467531633) | [K-Works (Apps)](https://appshunter.io/developer/1831663877) |

## What reviewers say

### Four Days

[App page](https://appshunter.io/ios/app/four-days/id1467531634)

This app helps manage food allergies by tracking your diet. It guides you through a rotation diet to avoid repetitive food consumption and prevent new intolerances. Maintain dietary diversity and support gut health.

**Highlights:** Rotation diet tracking, Avoid food repetition, Prevent new intolerances, Enhance nutrient diversity, Support gut healing

**Features:** macOS Compatibility

**In-app purchases:** none


### Barometric Headache Forecast

[App page](https://appshunter.io/ios/app/barometric-headache-forecast/id6775428368)

This app forecasts headache risk based on barometric pressure changes. It displays pressure graphs, weather, and temperature for your current location or a selected city, offering a simple guide for managing pressure and weather-related headaches.

**Highlights:** Headache risk forecast (Normal, Caution, Alert), Barometric pressure graph, Caution time identification, Weather and temperature display, Current location and city selection, Shareable forecast images

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

**In-app purchases:** none


## Frequently asked questions

### Is Four Days free?

Four Days costs $1.99, with no in-app purchases.

### Is Barometric Headache Forecast free?

Barometric Headache Forecast is free to download, with no in-app purchases.

### Which has better reviews, Four Days or Barometric Headache Forecast?

Barometric Headache Forecast is rated higher. Four Days averages 2.6 out of 5 from 8 ratings, while Barometric Headache Forecast averages 4.3 from 3 ratings.

### Do Four Days or Barometric Headache Forecast have ads?

Barometric Headache Forecast shows ads; Four Days does not.

### Which is updated more often, Four Days or Barometric Headache Forecast?

Four Days ships an update every 4 months, and Barometric Headache Forecast every 4 weeks. Most recently, Four Days was updated on November 3, 2026 and Barometric Headache Forecast on November 10, 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.*