--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Time Duration Calculator" developer_entity: "俊华 罗" bundle_id: "com.ljh.timecalc" app_store_id: "1339023361" google_play_id: "com.ptolemay.calculatorio.miscellaneous.time_duration" category: "Education" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2023-08-19" report_date: "2026-08-13" last_verified: "2026-08-13T00:00:00.000Z" report_version: "1.0.0" total_reviews: 16 overall_rating: 2.8 sentiment: "Mixed" sentiment_score: 52 confidence: "low" confidence_score: 0.35 review_sample_size: 15 data_age_days: 3 momentum_velocity: "zombie" intelligence_version: 7 nemesis: "Calculator +" competitor_count: 11 tags: ["education", "free", "mixed sentiment", "mobile app", "app review", "app analysis", "professionals,", "students,", "project"] canonical_url: "https://marlvel.ai/apps/time-duration-calculator" license: "CC-BY-NC 4.0" content_version: "v2" --- # Time Duration Calculator Intelligence Report ## TL;DR {#tldr} - **Category**: Education · Free - **Signal**: Rating 2.75 · Sentiment Mixed > **TL;DR:** Time Duration Calculator is a education app by 俊华 罗, rated 2.75/5 by 16 users, with Mixed user sentiment (52/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Time Duration Calculator has Mixed user sentiment with a 2.75/5 rating from 16 reviews. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 2.75/5 (16 reviews) | | **User Mood** | Mixed | | **Category** | Education | | **Developer** | 俊华 罗 | | **Pricing** | Free | | **Platforms** | iOS & Android | | **Confidence** | Low (0.35/1.0) | | **Data Age** | 3d | ## Metadata & Market Performance - **Publisher:** 俊华 罗 - **Category:** Education - **Target Audience:** Professionals, students, and project managers requiring precise time interval tracking. - **Platforms:** iOS & Android - **Version Reviewed:** 1.0 - **Report Date:** 2026-08-13 - **Signal Count:** 16 reviews analyzed - **Confidence:** Low (0.35/1.0) - **App Store ID (iOS):** 1339023361 - **Bundle ID:** com.ljh.timecalc - **Google Play ID:** com.ptolemay.calculatorio.miscellaneous.time_duration - **Performance Trend:** Mixed - **Data Window:** Analysis based on signals collected up to 2026-08-13 ## Executive Snapshot **What it is:** Time Duration Calculator is an education-category utility for calculating time intervals between two moments on iOS and Android. **Why users hire it:** Users hire the app to solve specific date-math problems, like calculating age or duration, without the clutter of a full scientific calculator. ## App DNA (Features & Intent) - **[Standard] Time Interval Calculation:** Calculates duration in years, months, days, hours, minutes, and seconds. - **[Standard] History Log:** Saves and retrieves past duration calculations. - **[Differentiator] Multi-Time Zone Support:** Computes intervals across different time zones. ## Market Position {#market-position} The app maintains a 2.6-star rating on Android with 15 reviews, reflecting its status as a legacy utility in the Education space. ## Monetization Strategy - **Model:** Free - **Tiers:** Free with ad support - **Analysis:** Monetization relies on ad-inventory generated by free-tier usage, as no paid tiers are present. ## 🟡 User Sentiment (Low Confidence: 16 reviews) {#user-sentiment} - **Overall Rating:** 2.75/5 - **Platform Split:** iOS 5.0/5 (1 ratings) | Android 2.6/5 (15 ratings) - **Overall Sentiment:** Mixed ## SWOT Analysis {#swot} **Core Strengths:** - Specialized focus on time-math provides a cleaner interface than generalist calculators **Growth Levers:** - Integration of result exporting would attract professional users currently using physics-based calculators ## Recent Changes (v6 → v7) {#recent-changes} The developer has moved from a maintenance-only stance to an active development plan focused on adding professional-grade features to compete with technical rivals. **Overall trend**: Mixed **Compared at**: 2026-08-13 ### High-impact changes - **[Shifted] PM Action Item Strategy** (positioning) ### Medium-impact changes - **[] Threat and Opportunity Refinement** (swot) ## Rivals Landscape {#rivals} > Competitive positioning identified by AI analysis of app features, category, and market signals. ### Time Duration Calculator vs Calculator + - **[Calculator +](https://marlvel.ai/apps/calculator-16)** by xNeat.com: This app competes by offering a comprehensive suite of mathematical tools that overlap with this app's time-calculation utility, capturing users who prefer an all-in-one calculator solution. - **Key differences:** - Offers advanced scientific and graphing capabilities that far exceed this app's simple duration-focused feature set - Maintains a massive user base and high-frequency update cadence, creating a significant barrier to entry - Provides a multi-functional utility ecosystem that encourages users to keep one app for all math needs ### Contenders (Strong Challengers) - **[Ratio & Text Calculator](https://marlvel.ai/apps/ratio-text-calculator)** by hideko ogawa: This app competes by combining ratio and text-based calculations, offering a unique utility set that overlaps with this app's math-centric audience. - Integrates text-based calculation features that allow for unique workflows not supported by this app's interface - Includes a dedicated ratio calculator, providing a specialized tool for users with specific mathematical requirements - **[Fluid Mechanics Calculator](https://marlvel.ai/apps/fluid-mechanics-calculator)** by V PUGAZHENTHI: This app competes by offering a deep, domain-specific library of parameters that targets the same technical demographic as this app's utility tools. - Provides a comprehensive parameter library for hydraulic infrastructure, offering deeper utility for specialized engineering tasks - Supports complex unit system conversions, which provides more robust functionality than this app's simple duration math - **[Electric Motors Speed Calc](https://marlvel.ai/apps/electric-motors-speed-calc)** by Nitrio: This app serves as a contender by providing specialized, physics-based calculation engines that attract professional and technical users. - Integrates a dedicated physics calculation engine that provides higher value for technical and engineering-focused users - Supports result exporting, a professional feature missing from this app's current basic calculation interface - **[Dash Calc: Simple Fast Math](https://marlvel.ai/apps/dash-calc-simple-fast-math)** by Enbright LLC: This app competes by prioritizing speed and efficiency in general calculations, appealing to the same utility-focused user base as this app. - Features a live results engine that provides instant feedback, outperforming this app's standard input-output workflow - Includes specialized modes for currency and percentages, broadening its utility beyond simple time-based arithmetic ### Peers (What They Do Better) - **[The Math Keyboard](https://marlvel.ai/apps/the-math-keyboard)** by Daniel Soffer: This app competes by providing system-wide integration for mathematical symbols, serving users who need advanced input tools. - Offers system-wide integration, allowing users to input complex mathematical symbols into any other mobile application - Includes a specialized library of scientific characters that this app does not currently support - **[CNVRT: SI Unit Conversion Tool](https://marlvel.ai/apps/cnvrt-si-unit-conversion-tool)** by Pascal Andraos: This app competes by offering a streamlined, color-coded interface for SI unit conversions, appealing to users who prioritize UX. - Utilizes a color-coded interface to improve readability and speed for users performing multiple unit conversions - Optimized for multi-platform use, providing a consistent experience across different device types and screen sizes - **[Units Converters.](https://marlvel.ai/apps/units-converters)** by V PUGAZHENTHI: This app competes by focusing on high-volume data sets and specialized scientific categories within the utility sector. - Features a high-volume data set for conversions that covers more scientific categories than this app - Targets a more technical audience with specialized scientific conversion categories not present in this app - **[Unit Converter and Calculator.](https://marlvel.ai/apps/unit-converter-and-calculator)** by Kemal Bakacak: This app occupies the same utility space by providing a broad library of unit conversions alongside standard calculation tools. - Offers extensive offline functionality, ensuring reliability for users without consistent internet access during calculations - Provides deeper personalization tools that allow users to tailor the interface to their specific workflow needs ### New Kids on the Block (What's Innovative) - **[Ponle TAX: Calculator IVA IVU](https://marlvel.ai/apps/ponle-tax-iva-ivu-discounts)** by Armando Jimenez: This app enters the space by providing specialized financial calculation tools, including tax and bill splitting, for a similar utility audience. - Includes practical financial tools like bill splitting and receipt management, which add significant value for daily users - **[Age Calculator – Date Counter](https://marlvel.ai/apps/age-calculator-date-counter)** by Mustafa Kulac: This newcomer directly challenges this app's core functionality by focusing on date-based tracking and age calculation. - Provides live time tracking and historical context features that offer more engagement than this app's static calculator ## What's New - **Latest (v1.0, 8 years ago):** General functionality improvements; no new features included. ## App Momentum (Zombie) {#momentum} - No updates since August 2023 - Stagnant feature development cycle > **Cadence:** 2 total versions · 0 majors in last 6 months · 999 days since last update · 2033 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Time Duration Calculator is an education app that is completely free. It holds a 2.75/5 rating from 16 reviews. > **Bottom Line:** The app provides a clean, lightweight utility for specific date-math tasks, but its 32-month update drought makes it a churn risk against modern, faster alternatives, so the developer must prioritize a feature refresh or risk total abandonment by the target audience. **Best for:** Professionals, students, and project managers requiring precise time interval tracking. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Ship result exporting because it is a missing professional feature → increase utility for technical users ### Feature Gaps vs Competitors - Result exporting (available in Electric Motors Speed Calc but missing here) ### Outlook: Declining The Education utility market is consolidating around apps that provide live, fast results and frequent updates. This app's lack of activity since 2023 leaves it exposed to newer, more responsive competitors, so the developer must pivot to a regular update cadence to avoid further sentiment decline. - 🔴 The 32-month release drought indicates the app is in maintenance mode, which signals to users that the tool is no longer supported. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 2.75/5 | | Total Reviews | 16 | | Sentiment | Mixed (52/100) | | Confidence | Low | | Pricing Model | Free | | Platforms | iOS & Android | | Key Features | 3 analyzed | | Trend | Mixed | | Outlook | Declining | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Time Duration Calculator** (this app) | 2.75/5 | Mixed | 俊华 罗 | | [Dash Calc: Simple Fast Math](https://marlvel.ai/apps/dash-calc-simple-fast-math) | 5.0/5 | Thrilled | Enbright LLC | | [Electric Motors Speed Calc](https://marlvel.ai/apps/electric-motors-speed-calc) | 4.0/5 | Thrilled | Nitrio | | [The Math Keyboard](https://marlvel.ai/apps/the-math-keyboard) | 3.4/5 | N/A | Daniel Soffer | | [Unit Converter and Calculator.](https://marlvel.ai/apps/unit-converter-and-calculator) | 4.2/5 | N/A | Kemal Bakacak | | [Fluid Mechanics Calculator](https://marlvel.ai/apps/fluid-mechanics-calculator) | 4.5/5 | N/A | V PUGAZHENTHI | ## Company Profile - **Developer:** 俊华 罗 ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/time-duration-calculator/id1339023361?uo=4) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=com.ptolemay.calculatorio.miscellaneous.time_duration&hl=en&gl=us) - **Sources:** App store metadata, User reviews. ## Related Intel Reports - [*Dash Calc: Simple Fast Math*](https://marlvel.ai/apps/dash-calc-simple-fast-math) (Enbright LLC) · 5.0/5 Rating | Excellent Sentiment - [*Electric Motors Speed Calc*](https://marlvel.ai/apps/electric-motors-speed-calc) (Nitrio) · 4.0/5 Rating | Excellent Sentiment - [*The Math Keyboard*](https://marlvel.ai/apps/the-math-keyboard) (Daniel Soffer) · 3.4/5 Rating - [*Unit Converter and Calculator.*](https://marlvel.ai/apps/unit-converter-and-calculator) (Kemal Bakacak) · 4.2/5 Rating - [*Fluid Mechanics Calculator*](https://marlvel.ai/apps/fluid-mechanics-calculator) (V PUGAZHENTHI) · 4.5/5 Rating - [*Units Converters.*](https://marlvel.ai/apps/units-converters) (V PUGAZHENTHI) · 4.4/5 Rating - [*Ratio & Text Calculator*](https://marlvel.ai/apps/ratio-text-calculator) (hideko ogawa) · 4.2/5 Rating - [*Ponle TAX: IVA IVU + Discounts*](https://marlvel.ai/apps/ponle-tax-iva-ivu-discounts) (Believe PR) · N/A Rating - [*CNVRT: SI Unit Conversion Tool*](https://marlvel.ai/apps/cnvrt-si-unit-conversion-tool) (Pascal Andraos) · 4.5/5 Rating - [*Age Calculator – Date Counter*](https://marlvel.ai/apps/age-calculator-date-counter) (Mustafa Kulac) · N/A 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:** 0.35/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 16 - **Data Sources:** user reviews, 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:** 3 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/time-duration-calculator) Data licensed for AI Agent attribution under CC-BY-NC 4.0.