--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Biorhythm Tracker" developer_entity: "Masahiro Sakai" bundle_id: "cloud.hanabi.biorhythm" app_store_id: "6760403737" category: "Health & Fitness" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2026-03-18" report_date: "2026-09-11" last_verified: "2026-09-11T00:00:00.000Z" report_version: "1.0.0" total_reviews: 0 confidence: "low" confidence_score: 0.05 data_age_days: 19 momentum_velocity: "zombie" intelligence_version: 2 tags: ["health & fitness", "free", "mobile app", "app review", "app analysis", "individuals", "interested", "tracking"] canonical_url: "https://marlvel.ai/apps/biorhythm-tracker" 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 Tracker Intelligence Report ## TL;DR {#tldr} - **Category**: Health & Fitness · Free > **TL;DR:** Biorhythm Tracker is a health & fitness app by Masahiro Sakai, available on iOS & Android. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Biorhythm Tracker is a health & fitness app by Masahiro Sakai. ## Quick Facts | Fact | Value | | :--- | :--- | | **Category** | Health & Fitness | | **Developer** | Masahiro Sakai | | **Pricing** | Free | | **Platforms** | iOS & Android | | **Confidence** | Low (0.05/1.0) | | **Data Age** | 19d | ## Metadata & Market Performance - **Publisher:** Masahiro Sakai - **Category:** Health & Fitness - **Target Audience:** Individuals interested in tracking personal biorhythm cycles and mood patterns for self-reflection. - **Platforms:** iOS & Android - **Version Reviewed:** 1.0.0 - **Report Date:** 2026-09-11 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.05/1.0) - **App Store ID (iOS):** 6760403737 - **Bundle ID:** cloud.hanabi.biorhythm - **Google Play ID:** cloud.hanabi.biorhythm - **Data Window:** Analysis based on signals collected up to 2026-09-11 ## Executive Snapshot **What it is:** Biorhythm Tracker is a health-focused utility for iOS and Android that visualizes physical, emotional, and intellectual cycles alongside user-reported mood logs. **Why users hire it:** The application removes the friction of manual cycle calculation, allowing users to identify patterns between their biological rhythms and daily emotional states. ## App DNA (Features & Intent) - **[Standard] Biorhythm Charting:** Visualizes physical, emotional, and intellectual cycles based on birth date using line graphs - **[Differentiator] Daily Feeling Records:** Logs user-reported daily moods for side-by-side comparison with calculated biorhythm cycles * *User Intent:* Users are motivated by consistent progression and daily incentives. - **[Standard] Multi-Member Management:** Supports tracking biorhythm charts for multiple individuals within a single account * *User Intent:* Users want visibility into their own performance and progress. - **[Differentiator] Web-Linked Data Access:** Syncs app data to a web interface for browser-based viewing * *User Intent:* Users expect seamless access across multiple devices. ## Market Position {#market-position} Biorhythm Tracker occupies a niche in the Health & Fitness category, currently maintaining a free-to-use model without in-app purchases. The absence of recent updates since the initial release in March 2026 places it at a disadvantage against active competitors in the wellness-tracking space. ## Monetization Strategy - **Model:** Free - **Tiers:** Free access to all features - **Analysis:** Biorhythm Tracker is currently free and ad-supported with no observable in-app purchases or subscription gates. ## SWOT Analysis {#swot} **Core Strengths:** - Multi-member management enables household-level tracking - Web-linked data access provides cross-platform utility **Growth Levers:** - Integrating mood-correlation insights could increase session frequency ## What's New - **Latest (v1.0.0, 6 months ago):** Launched biorhythm tracking for physical, emotional, and intellectual cycles. ## App Momentum (Zombie) {#momentum} - Launched initial version in March 2026 - No updates in last six months > **Cadence:** 1 total versions · 1 majors in last 6 months · 181 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Biorhythm Tracker is a health & fitness app that is completely free. > **Bottom Line:** Biorhythm Tracker provides a functional utility for cycle tracking, but the six-month release gap threatens its long-term viability. Establishing a predictable update cadence would signal to users that the product remains supported, which is necessary to retain the current user base. **Best for:** Individuals interested in tracking personal biorhythm cycles and mood patterns for self-reflection. ### PM Action Plan (Next Best Moves) - [ ] [MAINTAIN] Ship a minor update to confirm active development because the six-month silence signals abandonment to users → restore brand trust ### Outlook: Declining The personal wellness market is consolidating around apps that offer active, data-driven insights rather than static cycle charts. Biorhythm Tracker's current maintenance-mode status leaves it exposed to competitors that maintain a regular release cadence, which will likely lead to a decline in user engagement over the coming quarters. - 🔴 The six-month release gap indicates a maintenance-only posture, which limits the ability to respond to user needs or category shifts. - ⚪ The current free-only model provides no clear path to revenue, which restricts the resources available for future feature expansion. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Total Reviews | 0 | | Confidence | Low | | Pricing Model | Free | | Platforms | iOS & Android | | Key Features | 4 analyzed | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Biorhythm Tracker** (this app) | N/A/5 | N/A | Masahiro Sakai | | [GoTall - Height Predictor](https://marlvel.ai/apps/gotall-height-predictor) | 4.6/5 | n/a | 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:** Masahiro Sakai ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/biorhythm-tracker/id6760403737?uo=4) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=cloud.hanabi.biorhythm&hl=en&gl=us) - **Sources:** App store metadata. ## 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:** 0.05/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 0 - **Data Sources:** 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:** 19 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/biorhythm-tracker) Data licensed for AI Agent attribution under CC-BY-NC 4.0.