--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Aquarium Log - Tank Manager" developer_entity: "Ko Hyunshik" bundle_id: "com.kosick.aquadiary.ios" app_store_id: "1621042664" google_play_id: "com.lekysoft.aqlog" category: "Productivity" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2026-02-27" report_date: "2026-07-30" last_verified: "2026-07-30T00:00:00.000Z" report_version: "0.3.17" total_reviews: 259 overall_rating: 4.9 sentiment: "Thrilled" sentiment_score: 85 confidence: "high" confidence_score: 0.8 top_praise_theme: "Comprehensive aquarium management tools allow users to track water parameters and maintenance tasks across multiple tanks" top_complaint_theme: "Occasional bugs in the measurement input fields prevent data from saving correctly after backspacing" review_sample_size: 77 total_review_count: 77 analyzed_review_count: 60 data_age_days: 17 momentum_velocity: "maintenance" intelligence_version: 6 nemesis: "Aquarimate" competitor_count: 1 tags: ["productivity", "free", "thrilled sentiment", "mobile app", "app review", "app analysis", "aquarium", "hobbyists", "ranging"] canonical_url: "https://marlvel.ai/apps/aquarium-log-tank-manager" license: "CC-BY-NC 4.0" content_version: "v2" --- # Aquarium Log - Tank Manager Intelligence Report ## TL;DR {#tldr} - **Category**: Productivity · Free - **Signal**: Rating 4.86 · Sentiment Thrilled - **Recent focus**: Occasional bugs in the measurement input fields prevent data from saving correctly after backspacing (top complaint) · Comprehensive aquarium management tools allow users to track water parameters and maintenance tasks across multiple tanks (top praise) > **TL;DR:** Aquarium Log - Tank Manager is a productivity app by Ko Hyunshik, rated 4.86/5 by 259 users, with Thrilled user sentiment (85/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Aquarium Log - Tank Manager maintains Thrilled user sentiment (4.86/5 from 259 reviews), with users consistently praising comprehensive aquarium management tools allow users to track water parameters and maintenance tasks across multiple tanks. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.86/5 (259 reviews) | | **User Mood** | Thrilled | | **Category** | Productivity | | **Developer** | Ko Hyunshik | | **Pricing** | Free | | **Platforms** | iOS & Android | | **Confidence** | High (0.8/1.0) | | **Data Age** | 17d | ## Metadata & Market Performance - **Publisher:** Ko Hyunshik - **Category:** Productivity - **Target Audience:** Aquarium hobbyists ranging from beginners to professionals who need to track water parameters and maintenance schedules for multiple tanks. - **Platforms:** iOS & Android - **Version Reviewed:** 0.3.17 - **Report Date:** 2026-07-30 - **Signal Count:** 77 reviews analyzed - **Confidence:** High (0.8/1.0) - **App Store ID (iOS):** 1621042664 - **Bundle ID:** com.kosick.aquadiary.ios - **Google Play ID:** com.lekysoft.aqlog - **Performance Trend:** Declining - **Data Window:** Analysis based on signals collected up to 2026-07-30 ## Executive Snapshot **What it is:** Aquarium Log is a productivity tool for aquarium hobbyists to track water parameters, maintenance tasks, and livestock across multiple tanks on iOS and Android. **Why users hire it:** The app removes the cognitive friction of manual tank tracking by providing a centralized, calendar-based feed that replaces fragmented paper logs or spreadsheets. ## App DNA (Features & Intent) - **[Standard] Calendar View:** Visual organization of aquarium tasks and notes by date. Revenue link: Retention loop — daily task tracking increases app open frequency and habit formation. * *User Intent:* Users are motivated by consistent progression and daily incentives. - **[Differentiator] Unlimited Tank Management:** Support for tracking multiple aquariums within a single account. Revenue link: Retention — high-volume users with multiple tanks have higher switching costs. * *User Intent:* Users want visibility into their own performance and progress. - **[Differentiator] CSV Data Export:** Export of water parameter logs into CSV format for external analysis. Revenue link: Brand moat — provides utility for professional-grade hobbyists. * *User Intent:* Users seek enhanced value through premium features. ## Market Position {#market-position} Aquarium Log positions itself as the accessible, modern alternative to legacy management tools, currently holding a 4.86 rating across 259 total ratings. Its lack of monetization gates signals a focus on community growth over immediate revenue extraction. ## Monetization Strategy - **Model:** Free - **Tiers:** Free access to all features - **Analysis:** The app operates on a free model with no visible IAP or subscription gates, focusing on user acquisition and community growth. ## 🟢 User Sentiment (High Confidence: 60 of 77 reviews analyzed) {#user-sentiment} - **Overall Rating:** 4.86/5 - **Platform Split:** iOS 4.9/5 (259 ratings) - **Overall Sentiment:** Thrilled ### Top Praises - **Comprehensive aquarium management tools allow users to track water parameters and maintenance tasks across multiple tanks** - **The intuitive interface and simple design make complex aquarium maintenance feel less daunting for new hobbyists** - **The community social section provides a friendly space for users to share tank progress and exchange advice** ### Top Complaints (Impact Areas) - **Occasional bugs in the measurement input fields prevent data from saving correctly after backspacing** ## SWOT Analysis {#swot} **Core Strengths:** - Intuitive calendar-based UI reduces cognitive load for casual hobbyists - CSV export provides utility for professional-grade data manipulation **Growth Levers:** - Implement live data synchronization for household tank management - Expand livestock database to include amphibians and specific fish varieties ## Recent Changes (v5 → v6) {#recent-changes} Development velocity has stalled, shifting from a 24-day update cadence to a 5-month maintenance cycle, while technical save-failures in measurement fields have emerged as a new, high-impact retention risk. **Overall trend**: Declining **Compared at**: 2026-07-30 ### High-impact changes - **[Declined] Emergence of Technical Bugs** (sentiment) ### Medium-impact changes - **[Shifted] Feature Positioning Update** (features) - **[Declined] Social Section Friction** (sentiment) - **[Added] Notification Limitations** (swot) ## Rivals Landscape {#rivals} > Competitive positioning identified by AI analysis of app features, category, and market signals. ### Aquarium Log - Tank Manager vs Aquarimate - **[Aquarimate](https://marlvel.ai/apps/wiselogic-aquarimate)** by WiseLogic Inc: With over a decade of market presence and a significantly larger user base, Aquarimate serves as the primary benchmark for comprehensive aquarium management. - **Key differences:** - Offers a long-standing, established ecosystem for tracking complex aquarium parameters over many years of data. - Provides a more mature feature set for professional aquarists compared to this app's generalist approach. - Maintains a deep historical data repository that creates high switching costs for long-term hobbyists. ## What's New - **Latest (v1.3, 5 months ago):** Expanded data entry capabilities by adding pH and silicate values. ## App Momentum (Maintenance) {#momentum} - Ships bug fixes at 5-month cadence. - Added pH and silicate tracking. > **Cadence:** 2 total versions · 1 majors in last 6 months · 152 days since last update · 24 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Aquarium Log - Tank Manager is a market-leading productivity app that is completely free. With a 4.86/5 rating from 259 reviews, it delivers strong user satisfaction. > **Bottom Line:** Fixing the measurement save-failure would stabilize the core retention loop, which is currently threatened by data-entry frustration. Addressing this technical debt is the prerequisite for any future expansion into community or sync features. **Best for:** Aquarium hobbyists ranging from beginners to professionals who need to track water parameters and maintenance schedules for multiple tanks. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Ship fix for measurement input save-failures because users report data loss during daily logging → improve retention ### Feature Gaps vs Competitors - Live data synchronization (available in Aquarimate but absent here) ### Outlook: Stable The aquarium management market is consolidating around tools that offer both deep data tracking and social utility. Aquarium Log's current maintenance-mode cadence leaves it exposed to rivals that can iterate faster on user requests like live sync, which will erode its lead in the casual segment if not addressed. - 🔴 Maintenance-only update cadence (5 months since last release) leaves the app vulnerable to rivals with active live-ops and feature expansion. - 🟢 High user satisfaction (4.86 rating) provides a stable base for future monetization or community-building experiments once technical bugs are resolved. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.86/5 | | Total Reviews | 259 | | Sentiment | Thrilled (85/100) | | Confidence | High | | Pricing Model | Free | | Platforms | iOS & Android | | Key Features | 3 analyzed | | Trend | Declining | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Aquarium Log - Tank Manager** (this app) | 4.86/5 | Thrilled | Ko Hyunshik | | [Aquarimate](https://marlvel.ai/apps/wiselogic-aquarimate) | 4.4/5 | N/A | WiseLogic Inc | | [Mitsu: AI Life Coach](https://marlvel.ai/apps/mitsu-ai-life-coach) | N/A/5 | N/A | C2 Insights | | [ChatGPT](https://marlvel.ai/apps/chatgpt) | 4.8/5 | n/a | OpenAI OpCo, LLC | | [Pattrn - Discipline Tracker](https://marlvel.ai/apps/pattrn-discipline-tracker) | 4.8/5 | Thrilled | Pedro Schott | | [한음달-한국인에게 꼭 맞는 음력달력, 캘린더](https://marlvel.ai/apps/app--103) | 4.6/5 | N/A | YunaSoft Inc. | ## Company Profile - **Developer:** Ko Hyunshik - **Website:** [https://aquariumlog.app](https://aquariumlog.app) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/aquarium-log-tank-manager/id1621042664?uo=4) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=com.lekysoft.aqlog&hl=en&gl=us) - **Dev Site:** [Official Website](https://aquariumlog.app) - **Sources:** Developer website content, About us / company information, App store metadata, User reviews. ## Related Intel Reports - [*Aquarimate*](https://marlvel.ai/apps/wiselogic-aquarimate) (WiseLogic Inc) · 4.4/5 Rating - [*Mitsu: AI Life Coach*](https://marlvel.ai/apps/mitsu-ai-life-coach) (C2 Insights) · N/A Rating - [*ChatGPT*](https://marlvel.ai/apps/chatgpt) (OpenAI OpCo, LLC) · 4.8/5 Rating - [*Pattrn - Discipline Tracker*](https://marlvel.ai/apps/pattrn-discipline-tracker) (Pedro Schott) · 4.8/5 Rating | Excellent Sentiment - [*한음달-한국인에게 꼭 맞는 음력달력, 캘린더*](https://marlvel.ai/apps/app--103) (YunaSoft Inc.) · 4.6/5 Rating - [*바로메모 - 매일 바로 작성하는 메모장*](https://marlvel.ai/apps/cswpd-memo) (SuWon Choi) · N/A Rating - [*근로장려금 알리미 - 신청, 기준, 금액계산 가이드*](https://marlvel.ai/apps/com-swing2app-v3-d83e9bb95c05347f59ad81dea3b925ebf) (SY Company) · 3.8/5 Rating - [*통화관리솔루션 (부평구청용)*](https://marlvel.ai/apps/byto-bupyeong) (BYTO) · N/A Rating - [*시외버스터미널 예매가이드 - 시간표*](https://marlvel.ai/apps/com-rewd-metopcrent) (Multisoft app) · 4.1/5 Rating - [*スマホやめるにゃ*](https://marlvel.ai/apps/hiroto-nosnszone-nosnszone) (HIROTO TSUTSUSHIMA) · N/A Rating ## Frequently Asked Questions {#faq} ### Is Aquarium Log suitable for professional aquarists? While the app provides CSV export and graphing for water parameters, professional users may find the feature set limited compared to established rivals like Aquarimate, which offer deeper historical data tracking. ### How does Aquarium Log compare to Aquarimate? Aquarium Log offers a more modern, intuitive calendar-based interface for casual users, whereas Aquarimate provides a more mature, data-heavy architecture suited for long-term, professional-grade tank maintenance. ### Does the app have intrusive ads or hidden costs? No, the app is currently free with no visible IAP or subscription gates, focusing on user acquisition rather than monetization. ### What are some alternatives to Aquarium Log? Users seeking more advanced historical data tracking or professional-grade features should consider Aquarimate, which is the primary benchmark in the aquarium management category. ## 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:** 0.8/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 77 - **Data Sources:** user reviews, developer website, company about page, 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:** 17 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/aquarium-log-tank-manager) Data licensed for AI Agent attribution under CC-BY-NC 4.0.