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biorhythm cycles

biorhythm cycles

By Petro Riznyk

Biorhythm Cycles is a health-tracking utility for iOS that calculates and graphs personal energy cycles based on birth dates.

The App DNA

What makes this app unique?

It removes the connectivity dependency and data-privacy friction inherent in cloud-based health trackers by performing all calculations locally on the device.

For Individuals interested in tracking personal energy, mood, and focus cycles based on biorhythm theory.

What does it look like?

Key features

Biorhythm Calculationstandard

Calculates physical, emotional, and intellectual cycles based on birth date using classic or improved models.

Interactive Graphingstandard

Visualizes cycle highs and lows on a scrollable timeline.

On-Device Processingedge

Calculates all data locally without external server transmission, reducing privacy friction.

How much does it cost?

freemiumFree with ad-supported accessOne-time purchase to remove ads

The freemium model relies on ad-supported engagement, but the current implementation of audio ads is a primary churn driver.

Velocity

Maintenance developmentUX improvementsperformanceShow more...

Biorhythm Cycles maintains a maintenance-tier cadence, shipping only one release in the last 70 days. The latest update introduced a redesigned settings interface, a new welcome screen, and updated privacy controls. Development appears focused on modernizing the user experience and platform compatibility rather than frequent feature iteration. Given the current release frequency, the app is not currently operating on a high-velocity or live-ops model.

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Who built it?

Petro Riznyk

1 app tracked · Health & Fitness

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User Sentiment

What do users think recently?

Recent user voice shows a frustrated sentiment. Users appreciate long-term users find the core functionality highly useful for tracking their personal cycles over many years.

How are ratings & reviews evolving?

App Store
4.31 · 223

What users say, by theme

What Users Love
  • Long-term users find the core functionality highly useful for tracking their personal cycles over many years
What Frustrates Users
  • Inconsistent cycle calculations across different devices lead users to question the scientific validity of the app
+ 2 more themes
What Users Want 1 request inside

9 of 9 recent reviews analyzed · limited sample · Frustrated overall

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Unlock 2 more frustration themes and 1 user request, each backed by review evidence.

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Competition

Competitive landscape for biorhythm cycles

How's the Health & Fitness market?

Biorhythm Cycles maintains a 4.31-star rating across 223 total ratings. The app's reliance on local processing positions it as a privacy-first alternative in the Health & Fitness category, though its maintenance-mode release cadence limits its ability to address calculation bugs.

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The rivals identified

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The Analyst's Read

Key takeaways for biorhythm cycles

Where is it heading?

The health-tracking market is consolidating around apps with high-frequency live-ops and data-sync capabilities. Biorhythm Cycles remains exposed due to its maintenance-mode cadence and unresolved calculation errors, which will continue to compress the user base until the core utility is stabilized.

  • Inconsistent calculation results across devices erode user trust in the core utility, leading to negative sentiment and churn.
  • Forced audio advertisements at launch create a disruptive experience that directly conflicts with the app's simplicity-focused brand promise.

The SWOT

Core Strengths
  • On-device processing removes connectivity dependencies
Critical Frictions 2 weaknesses inside
Growth Levers
  • Manual time-zone offset controls resolve accuracy complaints
Market Threats 1 threat identified

Next best moves

1 Invest · 1 Pivot

Ship manual time-zone offset controls because calculation inaccuracy is the #1 user complaint → improve retention.

+ 1 more prioritized move

The counter-intuitive read

The app's maintenance-mode status is a feature, not a bug: its privacy-first…

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Bottom line

Biorhythm Cycles must resolve the time-zone detection logic to stabilize the core utility, as calculation inaccuracy is the primary driver of negative sentiment. Addressing this technical debt would unlock higher retention for the long-term user base that currently values the app's privacy-first design.

Unlock 2 critical frictions, 1 market threat, 1 more prioritized move and the analyst’s take.

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Sources

  1. [1] App Store listing, source

Report last updated

Disclosure: Independent intel to help mobile builders succeed.

AI-powered analysis with automated quality gates, built from publicly available sources. Marlvel.ai is not affiliated with, endorsed by, or sponsored by biorhythm cycles, its developer, the app publisher, Apple, or Google Play. All trademarks, logos, and screenshots referenced remain the property of their respective owners.

Cite this report

Marlvel.ai. “biorhythm cycles Intelligence Report.” Updated Sep 15, 2026. https://marlvel.ai/apps/biorhythm-cycles

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