Biorhythms and Critical Days 4+

Biorhythms Calculator


Designed for iPad

    • 4.7 • 235 Ratings
    • Free



Calculate your biorhythms and critical days! Check out your birth date compatibility with anyone!

Biorhythms app calculates your personal biorhythms, critical days and birth date compatibility. It allows you to create up to 10 user profiles with personalized color theme and daily reminder. The comprehensive and easy to use interface allows quick and efficient biorhythms check on daily basis.

- Elegant, easy to use interface;
- Calculates biorhythms from 2 weeks in the past to the next two months;
- Shows each biorhythm's cycle daily value for the specified period;
- Shows each biorhythm's cycle daily trend (raising / declining) for the specified period;
- Shows daily highlights - short description and advises for each day;
- Shows birth date compatibility;
- Calculates critical days;
- Provides short yet useful advice for each critical day;
- 18 different color themes to choose from;
- Personalized color theme for every user profile;
- Personalized daily reminder for every user profile;
- Up to 10 different user profiles;
- Additional cycles - Fortune and Intuition.

Biorhythms theory
The Biorhythms Theory states that human lives move in predictable, undulations involving three separate cycles:
- Physical - 23 days
- Emotional - 28 days
- Intellectual - 33 days
These cycles start at your day of birth and affect your daily life.

Critical days
Critical days have been described as full of danger and difficulty. They are days of flux and high instability. These are not days to fear, but to perhaps be on guard. Critical days are not days when an accident will occur, but are a time when you will be more accident prone. Just knowing that this is the case can prevent the accident or error.

What’s New

Version 4.4.0

Updated to comply iOS 14.0+ transparency policy

Ratings and Reviews

4.7 out of 5
235 Ratings

235 Ratings

Shannonw183 ,

By Far The Best for Biorhythms!!

Gives you daily or monthly breakdown of each measured trait! You can store multiple profiles, and can check up to two months ahead it’s an amazing app for Free!!
This one everyone should have!!
It helps me understand my loved ones when they seem to be a little off or super on point!
It also lets you know when your in a critical day (multiple traits on similar waves or intersecting)!! Like days of bad fortune mixed with negative emotions or bad physicality.
My only wish is, I would love for the opposite, super positive days like when your in great mood and should play the lottery !!! This is one to share to any and all who follow or pay attention to biorhythms!! I don’t recommend reading daily especially if it’s possibly negative because of obvious reasons, might contribute to negativeness

Krtyr ,


Biorhythms are the real deal! This app shows me what I need to know about my self, my partner, and my son. No wonder we barely get along (my son, that is)!! This helps me know how and when to communicate with him. I found that my partner and I are so great together because we are completely in sync! On days my chart suggests I stay home, i do! On days it suggest I can’t think straight, it’s right! Just WOW! To the developers.... Thank you! This app must have taken a great deal of time, research, and work. I applaud you, and Thank You again!!!!

nick777333 ,

Uh… wow.

It’s actually been accurate for me since I first got it. It’s so in depth and explains everything in detail. It has different settings where you can add as many people as you want: celebrities, friends, family, even yourself, & etc…

Not to mention, it shows critical days for you for the selected person to be aware of what’s to come and be cautious that day.
I was really skeptical at first, but it seemed to make me somewhat of a believer in it.

Still trying to figure out the whole biorhythms currently, but very intriguing and fascinating. Good job to whoever made this!! Totally recommend to all who need some more details on their future ahead or any other date they want info on. 😁👍

App Privacy

The developer, Sensortronic, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Identifiers
  • Usage Data

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Identifiers
  • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

More By This Developer

You Might Also Like

Numerology & Biorhythm
Biorhythm Calculator Simple
Numerology & Biorhythms