# Biorhythms and Critical Days vs Arhatic Trinity

The clearest difference is ads: Arhatic Trinity at none against Biorhythms and Critical Days's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Biorhythms and Critical Days ships an update every 3 weeks, Arhatic Trinity fortnightly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Biorhythms and Critical Days | Arhatic Trinity |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (326 ratings)](https://appshunter.io/ios/app/biorhythms-and-critical-days/id1486142952/reviews)** | — |
| Number of ratings | **326** | — |
| Positive reviews | 89.1% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Ad-supported | — |
| Size | 26 MB | 53 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sensortronic](https://appshunter.io/developer/1486142951) | [Satheesh Kumar Mahalingam](https://appshunter.io/developer/6783188266) |

## What reviewers say

### Biorhythms and Critical Days

[App page](https://appshunter.io/ios/app/biorhythms-and-critical-days/id1486142952)

This app calculates your personal biorhythms, critical days, and birth date compatibility. It supports multiple user profiles with customizable themes and reminders, offering daily insights and advice for physical, emotional, and intellectual cycles.

**Highlights:** Biorhythm calculation, Critical day identification, Birth date compatibility, Multiple user profiles, Daily highlights and advice, Customizable themes and reminders

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

**In-app purchases:** none

**What reviewers like**

- 👍 Accurate and helpful
- 👍 Easy to use
- 👍 Detailed information
- 👍 Useful for planning
- 👍 Reliable

**What reviewers complain about**

- 🐛 Inconsistent data
- 🐛 Buggy critical days feature
- 🐛 Unclear instructions
- 🐛 Poor translations
- 🔍 Cluttered UI with ads

**Reported bugs**

- Login screen freezes
- Incompatible with older devices
- Incorrect biorhythm calculations
- Overlapping text on mobile screens

**Requested features**

- Add note-taking functionality
- Expand future/past date range
- Improve color contrast and readability
- Provide more detailed compatibility analysis
- Offer paid ad-free version


### Arhatic Trinity

[App page](https://appshunter.io/ios/app/arhatic-trinity/id6784079308)

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

**In-app purchases:** none


## Frequently asked questions

### Is Biorhythms and Critical Days free?

Biorhythms and Critical Days is free to download, with no in-app purchases.

### Is Arhatic Trinity free?

Arhatic Trinity is free to download, with no in-app purchases.

### Do Biorhythms and Critical Days or Arhatic Trinity have ads?

Biorhythms and Critical Days shows ads; Arhatic Trinity does not.

### Which is updated more often, Biorhythms and Critical Days or Arhatic Trinity?

Biorhythms and Critical Days ships an update every 3 weeks, and Arhatic Trinity fortnightly. Most recently, Biorhythms and Critical Days was updated on November 3, 2026 and Arhatic Trinity on October 31, 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.*