Biorhythm vs Rytha
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Biorhythm
Understand your daily physical, emotional, and intellectual cycles. This app provides insights into your biorhythms, helping you make informed decisions and avoid potential risks by analyzing your daily, weekly, and monthly patterns.
- Daily biorhythm tracking
- Physical, emotional, and intellectual cycles
- Graph and value display
- Future biorhythm preview
- Share biorhythm data
- Accurate algorithmic calculations
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◉ Protect yourself by checking biorhythm daily. Stamina, judgment, emotion, etc. If you are not feeling well about the following measures, how about checking your biorhythm? If your biorhythm does not function appropriately, it is recommended to avoid unreasonable activities. Something might you don't want to happen. Biorhythm can be referenced in all areas of your life such as learning, sports and sales. ◉ It will advise your future. Suddenly, some of the celebrities faced traumas The cases showed that their biorhythms weren't good. Was it a coincidence? ◉ What is biorhythm? Biorhythm is the physiological cycle of a physical, emotional, and Intellectual. These three cycles are repeated in a uniform pattern based on your birthdays, and there is a difference in activity efficiency or ability depending on the combination of these patterns. The four rhythm cycles and calculations are as follows. d = number of days of living Physical rhythm: sin (2π d / 23) Emotional rhythm: sin (2π d / 28) Intellectual rhythm: sin (2π d / 33) Intuitive rhythm: sin (2π d / 38) Each rhythm has a value from -100 to +100, and this value indicates the status. Low stage: -100 to -1 High stage: +1 to +100 Dangerous Days: 0 (at the time of transition from + value to - value or from - value to + value) ◉ Explanation of Application function [Biorhythm] • Display the four rhythms of a user as values and graphs • Change dates easily to view biorhythms [Share] • Send biorhythm using messages or email [Information] • Summary of usage • Help • Contact the developer ◉ It is not a simple graph. • Accurate data using formal algorithms • Sophisticated and easy-to-see graphs • Send biorhythm using messages or email • Easy to use at anywhere, at anytime • Preview of future biorhythms ◉ Notification • If you have any questions, please use the email function on the app. mic apps • This is a completely free app, so no payment or subscription is required.
Rytha
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Rytha accompanies your everyday life – quietly, on your own device. Follow your personal biorhythm for body, soul and mind, note what matters in your diary, and see how sun and moon shape your day. On your own, or together with a partner. WHAT RYTHA GIVES YOU • Biorhythm cards for body, soul and mind, with the trend compared to yesterday • A personal diary: a thought, a mood, a photo – ‚ as much or as little as you like • History and calendar, so you can see how your days connect • Sky calendar for your location: sunrise and sunset, moon phase and illumination, zodiac sign • Name days from the German calendar • Profiles for several people, and an optional link between two profiles to view their rhythms side by side • A personal review as a PDF you can keep or share • Home Screen widget for a glance at today • App lock with Face ID, Touch ID or your device passcode • Backup and restore, as a file you control YOUR DATA STAYS YOURS Rytha keeps your profiles, diary entries and attachments only on this device. There is no account, no cloud sync, and none of your data is sent to external servers. A backup is a local file – you decide where it goes and who sees it. Your location is used solely to calculate sun and moon times, and only after you allow it. PREMIUM, WITHOUT A SUBSCRIPTION The personal PDF review and linked partner profiles are Premium features. Buy once, keep it forever. No subscription, no recurring charges. A NOTE ON BIORHYTHM Biorhythm curves are calculated from your date of birth using fixed cycles. They are an aid for reflection, not a scientific measure. Rytha is not a medical app and does not give health advice.
Screenshots
Verdict
The clearest difference is in-app purchases: Biorhythm at none against Rytha's 1. Rytha's advantage is ads (none vs shown) and update cadence (every 4 days vs monthly). On price, device support and iOS requirement 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. Rytha sells 1 one-off in-app purchase. Biorhythm asks for nothing beyond the download.
Biorhythm ships an update monthly, Rytha every 4 days. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.
| Parameter | Biorhythm | Rytha |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (3.9K ratings) — better | — |
| Positive reviews | 84.3% of reviews | — |
| Number of ratings | 3.9K — better | — |
| Update frequency | Monthly | Every 4 days — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 7 MB | 3 MB |
| Age rating | +4 | 4+ |
| Developer | Jeonghwan Kim | Thomas Stahmer |
Bugs and requests
Biorhythm
Reported bugs
2 issues- Birthday icon does not always function as expected
- App freezes or crashes on some devices
Requested features
4 requests- Add ability to track multiple user profiles
- Implement date/month scrolling for easier navigation
- Provide more detailed information and explanations
- Include option to remove ads without paid upgrade
Rytha
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Biorhythm
No in-app purchases
Rytha
- Rytha Premium$5.99









