--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "biorhythm cycles" developer_entity: "Petro Riznyk" bundle_id: "PR.BioRhythm" app_store_id: "879917580" category: "Health & Fitness" primary_platform: "ios" primary_monetization: "Freemium" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2026-07-07" report_date: "2026-09-15" last_verified: "2026-09-15T00:00:00.000Z" report_version: "2.1.0" total_reviews: 223 overall_rating: 4.3 sentiment: "Frustrated" sentiment_score: 35 confidence: "medium" confidence_score: 0.5 top_praise_theme: "Long-term users find the core functionality highly useful for tracking their personal cycles over many years" top_complaint_theme: "Inconsistent cycle calculations across different devices lead users to question the scientific validity of the app" review_sample_size: 9 total_review_count: 9 analyzed_review_count: 9 data_age_days: 15 momentum_velocity: "maintenance" intelligence_version: 2 tags: ["health & fitness", "freemium", "frustrated sentiment", "mobile app", "app review", "app analysis", "individuals", "interested", "tracking"] canonical_url: "https://marlvel.ai/apps/biorhythm-cycles" license: "CC-BY-NC 4.0" content_version: "v2" --- ## ⚠ Content Warning This report covers topics classified as sensitive (health). Information is aggregated from public sources for informational purposes only. This is not medical advice. Consult a qualified professional before acting on any information here. --- # biorhythm cycles Intelligence Report ## TL;DR {#tldr} - **Category**: Health & Fitness · Freemium - **Signal**: Rating 4.31 · Sentiment Frustrated - **Recent focus**: Inconsistent cycle calculations across different devices lead users to question the scientific validity of the app (top complaint) · Long-term users find the core functionality highly useful for tracking their personal cycles over many years (top praise) > **TL;DR:** biorhythm cycles is a health & fitness app by Petro Riznyk, rated 4.31/5 by 223 users, with Frustrated user sentiment (35/100), available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** biorhythm cycles faces Frustrated user sentiment (4.31/5 from 223 reviews), with users reporting inconsistent cycle calculations across different devices lead users to question the scientific validity of the app as the primary concern. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.31/5 (223 reviews) | | **User Mood** | Frustrated | | **Category** | Health & Fitness | | **Developer** | Petro Riznyk | | **Pricing** | Freemium | | **Platforms** | iOS | | **Confidence** | Medium (0.5/1.0) | | **Data Age** | 15d | ## Metadata & Market Performance - **Publisher:** Petro Riznyk - **Category:** Health & Fitness - **Target Audience:** Individuals interested in tracking personal energy, mood, and focus cycles based on biorhythm theory. - **Platforms:** iOS - **Version Reviewed:** 2.1.0 - **Report Date:** 2026-09-15 - **Signal Count:** 9 reviews analyzed - **Confidence:** Medium (0.5/1.0) - **App Store ID (iOS):** 879917580 - **Bundle ID:** PR.BioRhythm - **Data Window:** Analysis based on signals collected up to 2026-09-15 ## Executive Snapshot **What it is:** Biorhythm Cycles is a health-tracking utility for iOS that calculates and graphs personal energy cycles based on birth dates. **Why users hire it:** It removes the connectivity dependency and data-privacy friction inherent in cloud-based health trackers by performing all calculations locally on the device. ## App DNA (Features & Intent) - **[Standard] Biorhythm Calculation:** Calculates physical, emotional, and intellectual cycles based on birth date using classic or improved models. * *User Intent:* Users seek enhanced value through premium features. - **[Standard] Interactive Graphing:** Visualizes cycle highs and lows on a scrollable timeline. - **[Differentiator] On-Device Processing:** Calculates all data locally without external server transmission, reducing privacy friction. * *User Intent:* Users prioritize data protection and trust in the platform. ## Market Position {#market-position} 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. ## Monetization Strategy - **Model:** Freemium - **Tiers:** Free with ad-supported access, One-time purchase to remove ads - **Analysis:** The freemium model relies on ad-supported engagement, but the current implementation of audio ads is a primary churn driver. ## 🔴 User Sentiment (Medium Confidence: 9 of 9 reviews analyzed) {#user-sentiment} - **Overall Rating:** 4.31/5 - **Platform Split:** iOS 4.3/5 (223 ratings) - **Overall Sentiment:** Frustrated - **Note:** The 4.31/5 store rating reflects cumulative history, while the Frustrated sentiment reflects recent user reviews analyzed by our AI pipeline. ### Top Praises - **Long-term users find the core functionality highly useful for tracking their personal cycles over many years** ### Top Complaints (Impact Areas) - **Inconsistent cycle calculations across different devices lead users to question the scientific validity of the app** ## SWOT Analysis {#swot} **Core Strengths:** - On-device processing removes connectivity dependencies **Growth Levers:** - Manual time-zone offset controls resolve accuracy complaints ## What's New - **Latest (v2.1.0, 2 months ago):** Introduced a new welcome screen for birth date entry, a redesigned Settings menu with a calendar picker, and granular privacy and ad tracking controls. ## App Momentum (Maintenance) {#momentum} - Ships ~1 major update per year. - Latest release added privacy controls. > **Cadence:** 1 total versions · 1 majors in last 6 months · 70 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} biorhythm cycles is a health & fitness app that is free with in-app purchases. With a 4.31/5 rating from 223 reviews, it draws more critical themes in recent reviews than its store average suggests. > **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. **Best for:** Individuals interested in tracking personal energy, mood, and focus cycles based on biorhythm theory. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Ship manual time-zone offset controls because calculation inaccuracy is the #1 user complaint → improve retention. ### Outlook: Declining 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. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.31/5 | | Total Reviews | 223 | | Sentiment | Frustrated (35/100) | | Confidence | Medium | | Pricing Model | Freemium | | Platforms | iOS | | Key Features | 3 analyzed | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **biorhythm cycles** (this app) | 4.31/5 | Frustrated | Petro Riznyk | | [GoTall - Height Predictor](https://marlvel.ai/apps/gotall-height-predictor) | 4.6/5 | Mixed | Grow Labs LLC | | [Mind - Méditations guidées](https://marlvel.ai/apps/mind-m-ditations-guid-es) | 4.6/5 | Excited | MIND AND CIE | | [Strava: Run, Bike, Walk](https://marlvel.ai/apps/strava-run-bike-walk) | 4.7/5 | n/a | Strava, Inc. | | [Taller AI: Height Maximizer](https://marlvel.ai/apps/taller-ai-height-maximizer) | 4.7/5 | Excited | Leadimize | | [TallerTeen - Grow Taller Now](https://marlvel.ai/apps/tallerteen-grow-taller-now) | 4.7/5 | n/a | Viral App Developement LLC | ## Company Profile - **Developer:** Petro Riznyk - **Website:** [https://biorythm-cycles.netlify.app](https://biorythm-cycles.netlify.app) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/biorhythm-cycles/id879917580?uo=4) - **Dev Site:** [Official Website](https://biorythm-cycles.netlify.app) - **Sources:** Developer website content, App store metadata, User reviews. ## Related Intel Reports - [*GoTall - Height Predictor*](https://marlvel.ai/apps/gotall-height-predictor) (Grow Labs LLC) · 4.6/5 Rating - [*Mind - Méditations guidées*](https://marlvel.ai/apps/mind-m-ditations-guid-es) (MIND AND CIE) · 4.6/5 Rating | Positive Sentiment - [*Strava: Run, Bike, Walk*](https://marlvel.ai/apps/strava-run-bike-walk) (Strava, Inc.) · 4.7/5 Rating - [*Taller AI: Height Maximizer*](https://marlvel.ai/apps/taller-ai-height-maximizer) (Leadimize) · 4.7/5 Rating | Positive Sentiment - [*TallerTeen - Grow Taller Now*](https://marlvel.ai/apps/tallerteen-grow-taller-now) (Viral App Developement LLC) · 4.7/5 Rating - [*Activity Tracker・FitnessView*](https://marlvel.ai/apps/activity-tracker-fitnessview) (Funn Media, LLC) · 4.0/5 Rating - [*Avatran Soul*](https://marlvel.ai/apps/avatran-soul) (Avatran GmbH) · N/A Rating - [*Bubblic: Connect with people.*](https://marlvel.ai/apps/bubblic-connect-with-people) (Bubblic Inc.) · 4.6/5 Rating | Excellent Sentiment - [*evolum - Meditation & Yoga*](https://marlvel.ai/apps/evolum-meditation-yoga) (Evolum) · 4.7/5 Rating | Positive Sentiment - [*Holoholo: Daily Memories*](https://marlvel.ai/apps/holoholo-daily-memories) (For Pedestrians LLC.) · 4.4/5 Rating ## Methodology {#methodology} This report was generated by Marlvel.ai's 5-stage AI intelligence pipeline: 1. **Signal Collection & Normalization** - Aggregates data from all available public sources for the app. Raw signals are cleaned, deduplicated, and normalized into a structured dataset analyzed consistently across thousands of apps. 2. **Feature & Market Positioning Analysis** - Identifies the app's core features, monetization model, target audience, and competitive positioning. Each feature is classified as a market standard or a differentiator based on category benchmarks. 3. **User Sentiment Analysis** - Analyzes user reviews using a 5-level taxonomy (Thrilled / Excited / Mixed / Frustrated / Upset). Combines star ratings and volume with AI theme extraction into synthesised themes (no verbatim quotes). 4. **Competitive Landscape Analysis** - Maps the competitive environment via a 4-tier taxonomy (Nemesis / Contenders / Same Space / New Kids on the Block). Prioritizes same sub-genre over broad category. 5. **Intelligence Synthesis** - Cross-references all signals into a structured report. Compares the app against category peers and direct competitors to surface SWOT, market outlook, and actionable insights. - **Confidence Score:** 0.5/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 9 - **Data Sources:** user reviews, developer website, App Store metadata - **Rating Method:** Weighted average across platforms (iOS & Android), weighted by review count per platform - **Independence:** Fully independent analysis. No publisher sponsorship or editorial influence. - **Report Age:** 15 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/biorhythm-cycles) Data licensed for AI Agent attribution under CC-BY-NC 4.0.