Comparison

Four Days vs Barometric Headache Forecast

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Four Days

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
Read full description

If you have multiple food allergies, one of the best ways to help yourself is to “rotate” your foods, or eat a rotation diet. Four days allow you to keep track of what you are eating to avoid repetition and prevent you from forming new food intolerances What is a rotation diet? A rotation diet is a system of controlling food allergies by eating biologically related foods on the same day and then waiting at least four days before eating them again. Such a diet can help those with food allergies in several ways and may help prevent the development of allergies to new foods. Why rotate your foods? 1. We are biologically designed to rotate foods. Man is meant to eat with the seasons. We are not designed to eat avocado every single day, because nature does not allow for it. In nature (or even 100-150 years ago) we ate what was local and available. 2. Rotation allows for more nutrient diversity. If we eat avocado as our main source of fat every day, we’re missing out on all of the healthy fats in olive oil, coconut, and beef tallow. Different foods come with different nutrients and we need variety for vibrancy! 3. Eating the same foods constantly can cause food intolerances and impede gut healing Any food, if eaten repetitively, can cause food allergies especially if we have gut issues. Why? Like we stated above, our bodies aren’t designed to eat the same thing over and over again. And if we have permeable intestines and are eating avocado daily, our immune system is reacting to the avocado over, and over, and over again. Eventually it becomes too much. Surely, the goal is to heal the gut. However, an important piece of gut healing is to remove inflammation, and stopping new intolerances from forming. Thus, a rotation diet can be an amazing strategy within a gut healing template.

About

Barometric Headache Forecast

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
Read full description

For people concerned about pressure headaches and weather-related headaches. Pressure Headache Forecast is a simple headache forecast app that lets you check barometric pressure changes and headache risk at a glance. On low-pressure days, before the weather changes, or during hours when barometric pressure drops sharply, the app shows “when to be careful today” in an easy-to-read graph. Just use your current location or select a city to check the pressure graph, weather, temperature, and headache forecast in one place. No account registration or complicated setup is required. ■ What you can do with Pressure Headache Forecast 【Headache forecast】 Based on barometric pressure changes, the app shows headache risk as “Normal,” “Caution,” or “Alert.” You can check the risk intuitively with colors and markers, not just numbers. 【Barometric pressure graph】 The app displays barometric pressure changes in a graph. You can quickly see when pressure is dropping or when changes are large. 【Check caution times】 The app clearly shows time periods when headache risk may increase. Use it as a simple guide on low-pressure days or when weather-related headaches are a concern. 【Weather and temperature】 In addition to pressure, you can also check the weather and temperature. Use it as a reference for managing your condition throughout the day. 【Current location and city selection】 You can display the forecast for your current location. You can also check the forecast by selecting a city without using location services. 【Share】 You can share the pressure graph and headache forecast as an image. This is useful when you want to tell family or friends about pressure changes or caution times. ■ Recommended for people who want to ・Check headache risk on low-pressure days ・Use a simple guide for weather-related headaches or pressure headaches ・See barometric pressure changes in a graph ・Know when headache risk may be higher ・Use a simple headache forecast app ・Check pressure, weather, and temperature together ・Use an app easily without creating an account ・Use a view-only app instead of a complicated health tracking app ■ Features of Pressure Headache Forecast ・Simple screen centered on a pressure graph ・Headache risk shown as “Normal,” “Caution,” or “Alert” ・Check forecasts using your current location or selected city ・Weather, temperature, and pressure shown together ・No account registration required ・No tracking log ・No notifications ・No complicated settings ・No full-screen ads ・Lightweight design for quick checking ■ For checking pressure headaches and weather-related headaches Changes in barometric pressure can be an important reference for people who are concerned about headaches or changes in their condition. Pressure Headache Forecast displays pressure changes in a graph and clearly shows time periods when headache risk may increase. “Is the pressure going to drop today?” “Will low pressure affect me?” “When should I be careful about weather-related headaches?” When you want to know, just open the app and check the pressure and headache forecast. ■ Notes The headache forecast in this app is reference information based on weather data. It is not intended for diagnosis, treatment, or prevention. If you have concerns about your health, severe headaches, or symptoms that continue for a long time, please consult a medical professional.

Screenshots

Four Days4 screens
Barometric Headache Forecast2 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Four Days versus Barometric Headache Forecast: the parameters behind the verdict, then further details
ParameterFour DaysBarometric Headache Forecast
Price$1.99Free — better
Rating2.6 (8 ratings)4.3 (3 ratings) — better
Positive reviews44.4% of reviews100.0% of reviews — better
Number of ratings8 — better3
Update frequencyEvery 4 monthsEvery 4 weeks — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaidAd-supported — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.4 — better15.0
Further details — not scored
Size23 MB26 MB
Age rating4+12+
DeveloperSergio Gutierrez MotaK-Works (Apps)

Customer experience

Four Days

All ratings8 ratings
Positive37.5%
Neutral12.5%
Negative50.0%
Written reviews9 reviews
Positive44.4%
Neutral22.2%
Negative33.3%

Barometric Headache Forecast

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Four Days

No in-app purchases

None

Barometric Headache Forecast

No in-app purchases

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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