Comparison

Four Days vs Yin Timer

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

Yin Timer

A discreet timer designed for calm activities like yoga or meditation. Set your desired duration, and the analog face completes one turn, providing a peaceful timekeeping experience without distracting ticking.

Highlights
  • Calm and discreet timer
  • Ideal for yoga and meditation
  • Analog face timekeeping
  • Customizable duration
  • No distracting ticking
Features
Read full description

A calm and discreet timer. This is perfect for yoga or meditation where a clock with ticking seconds will be distracting and stressful. Just choose how many minutes you want your timer to be, and it will go one turn of the analog face in that time. Slow and calm.

Screenshots

Four Days4 screens
Yin Timer1 screens

Verdict

The call

The clearest difference is price: Yin Timer at Free against Four Days's $1.99. Yin Timer also leads on rating (5.0 vs 2.6). Four Days's advantage is ratings volume (8 vs 1). On update cadence, ads, 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

Yin Timer 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

Yin Timer holds the better App Store score, 5.0 against 2.6. That said, the two scores are not equally well evidenced: Four Days has 8 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 1, 2026 and October 6, 2026 respectively.

Scorecard4 real differences · 6 level
Four Days versus Yin Timer: the parameters behind the verdict, then further details
ParameterFour DaysYin Timer
Price$1.99Free — better
Rating2.6 (8 ratings)5.0 (1 ratings) — better
Positive reviews44.4% of reviews—
Number of ratings8 — better1
Update frequencyEvery 4 monthsEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, iPod
Requires iOS13.4 — better14.0
Further details — not scored
Size23 MB4 MB
Age rating4+4+
DeveloperSergio Gutierrez MotaKodare

Customer experience

Four Days

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

Yin Timer

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Four Days

No in-app purchases

None

Yin Timer

No in-app purchases

Questions

Is Four Days free?
Four Days costs $1.99, with no in-app purchases.
Is Yin Timer free?
Yin Timer is free to download, with no in-app purchases.
Which has better reviews, Four Days or Yin Timer?
Yin Timer is rated higher. Four Days averages 2.6 out of 5 from 8 ratings, while Yin Timer averages 5.0 from 1 ratings.
Do Four Days or Yin Timer have ads?
Neither Four Days nor Yin Timer shows ads.
Which is updated more often, Four Days or Yin Timer?
Four Days ships an update every 4 months, and Yin Timer every 4 months. Most recently, Four Days was updated on October 1, 2026 and Yin Timer on October 6, 2026.

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