Biorhythms and Critical Days vs Arhatic Trinity
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Biorhythms and Critical Days
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.
- Biorhythm calculation
- Critical day identification
- Birth date compatibility
- Multiple user profiles
- Daily highlights and advice
- Customizable themes and reminders
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Calculate your biorhythms and critical days, and check your birth date compatibility with anyone! Biorhythms is a personal biorhythm calculator and chart covering 8 cycles: physical, emotional, intellectual, intuition, fortune, aesthetic, awareness and spiritual, plus an overall daily rating. Create up to 10 user profiles, each with its own color theme and daily reminder. The clean, easy to use interface makes your daily biorhythm check quick and effortless. No account and no sign up: your personal data stays on your device. Features • Elegant, easy to use interface; • 8 biorhythm cycles plus an overall daily rating; • Calculates biorhythms from 2 weeks in the past to 2 months ahead; • Shows each cycle's daily value for the selected period; • Shows each cycle's daily trend (rising / declining); • Daily highlights: a short description and advice for each day; • Birth date compatibility for any two people; • Calculates critical days; • Short, useful advice for each critical day; • 18 color themes to choose from; • Personalized color theme for every user profile; • Personalized daily reminder for every user profile; • Up to 10 user profiles; • Available in 8 languages. Biorhythm theory Biorhythm theory states that our lives move in predictable undulations, driven by cycles that start at birth and run at a fixed pace. The three classic cycles are: • Physical, 23 days; • Emotional, 28 days; • Intellectual, 33 days. Beyond the classic three, the app also charts five extended cycles: intuition (38 days), fortune (21 days), aesthetic (43 days), awareness (48 days) and spiritual (53 days). Critical days A critical day comes when a cycle crosses the zero line, switching from its high phase to its low phase or back. Such days have been described as days of flux and instability. They are not days when an accident will happen, but days when you may be more accident prone. Simply knowing it is a critical day helps you stay on guard and plan around it. Privacy notes • Your personal data (e.g. name and date of birth) is stored locally within your instance of the Biorhythms app only; • If you uninstall the app, your personal data is deleted completely from your device; • We do NOT store your personal data on our premises.
Arhatic Trinity
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A sacred home for Arhatic Yoga practitioners — and a free breath for everyone. BREATHE — FREE FOR EVERYONE A calm breathing pacer with gentle tone, wave, or pulse guidance and soft opening and closing music. Shape your own patterns and pace. No account tier required — the breath is a gift, always. EMOTIONS — YOUR PRIVATE JOURNAL Log how you feel and review it by day, week, or month. Navigate to any day and back-fill an entry. Private to you — never counted, never shared. FOR VERIFIED ARHATIC YOGA PRACTITIONERS Completed a GMCKS Arhatic Yoga workshop? Share your certificate in the app (or by email) — verification is by hand and always free. Your practice tabs then open: • Dashboard — where you stand today: current virtue, mandala, streak, and this week's meditations • Daily Log — tick the lineage practices you completed, day by day • Character building and mandala cycles with your own start dates and lengths • Tithing log — private to you, always KRIYASHAKTI For practitioners with the Kriyashakti workshop: wishes and tithing side by side — decree, materialize, and log. OUR PROMISE Free forever. No ads. No analytics. No paywall — verification is never payment. Tithing and Kriyashakti records are never aggregated or shared, not even anonymously. Aspire Higher · Radiate Brighter arhatictrinity.com · support@kirusai.com
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Biorhythms and Critical Days | Arhatic Trinity |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (326 ratings) — better | — |
| Positive reviews | 89.1% of reviews | — |
| Number of ratings | 326 — better | — |
| Update frequency | Every 3 weeks | Fortnightly — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 26 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | Sensortronic | Satheesh Kumar Mahalingam |
Bugs and requests
Biorhythms and Critical Days
Reported bugs
4 issues- Login screen freezes
- Incompatible with older devices
- Incorrect biorhythm calculations
- Overlapping text on mobile screens
Requested features
5 requests- 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
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Biorhythms and Critical Days
No in-app purchases
Arhatic Trinity
No in-app purchases
Questions
Is Biorhythms and Critical Days free?
Is Arhatic Trinity free?
Do Biorhythms and Critical Days or Arhatic Trinity have ads?
Which is updated more often, Biorhythms and Critical Days or Arhatic Trinity?
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