Four Days vs Yin Timer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Rotation diet tracking
- Avoid food repetition
- Prevent new intolerances
- Enhance nutrient diversity
- Support gut healing
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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.
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.
- Calm and discreet timer
- Ideal for yoga and meditation
- Analog face timekeeping
- Customizable duration
- No distracting ticking
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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
Verdict
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
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.
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.
Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 1, 2026 and October 6, 2026 respectively.
| Parameter | Four Days | Yin Timer |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 2.6 (8 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 44.4% of reviews | — |
| Number of ratings | 8 — better | 1 |
| Update frequency | Every 4 months | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 13.4 — better | 14.0 |
| Further details — not scored | ||
| Size | 23 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Sergio Gutierrez Mota | Kodare |
Customer experience
Four Days
Yin Timer
In-app purchases
Four Days
No in-app purchases
Yin Timer
No in-app purchases
Questions
Is Four Days free?
Is Yin Timer free?
Which has better reviews, Four Days or Yin Timer?
Do Four Days or Yin Timer have ads?
Which is updated more often, Four Days or Yin Timer?
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