--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Time : Calculator++" developer_entity: "YUTAKA KENJO" bundle_id: "com.kdevelop.TimeCalc" app_store_id: "1554799802" category: "Productivity" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS & Android" app_last_updated: "2026-05-26" report_date: "2026-09-16" last_verified: "2026-09-16T00:00:00.000Z" report_version: "1.25" total_reviews: 1853 overall_rating: 4.7 sentiment: "Excited" sentiment_score: 75 confidence: "high" confidence_score: 0.8 top_praise_theme: "Time calculation convenience allows users to avoid manual arithmetic when managing fluctuating work schedules" top_complaint_theme: "Privacy settings fail to persist user choices, leading to concerns about data handling and vendor tracking" review_sample_size: 50 total_review_count: 50 analyzed_review_count: 50 data_age_days: 14 momentum_velocity: "maintenance" intelligence_version: 2 tags: ["productivity", "free", "excited sentiment", "mobile app", "app review", "app analysis", "professionals", "individuals", "tracking"] canonical_url: "https://marlvel.ai/apps/time-calculator-2" license: "CC-BY-NC 4.0" content_version: "v2" --- # Time : Calculator++ Intelligence Report ## TL;DR {#tldr} - **Category**: Productivity · Free - **Signal**: Rating 4.67 · Sentiment Excited - **Recent focus**: Privacy settings fail to persist user choices, leading to concerns about data handling and vendor tracking (top complaint) · Time calculation convenience allows users to avoid manual arithmetic when managing fluctuating work schedules (top praise) > **TL;DR:** Time : Calculator++ is a productivity app by YUTAKA KENJO, rated 4.67/5 by 1.9K users, with Excited user sentiment (75/100), available on iOS & Android. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Time : Calculator++ maintains Excited user sentiment (4.67/5 from 1.9K reviews), with users consistently praising time calculation convenience allows users to avoid manual arithmetic when managing fluctuating work schedules. ## Quick Facts | Fact | Value | | :--- | :--- | | **Rating** | 4.67/5 (1.9K reviews) | | **User Mood** | Excited | | **Category** | Productivity | | **Developer** | YUTAKA KENJO | | **Pricing** | Free | | **Platforms** | iOS & Android | | **Confidence** | High (0.8/1.0) | | **Data Age** | 14d | ## Metadata & Market Performance - **Publisher:** YUTAKA KENJO - **Category:** Productivity - **Target Audience:** Professionals and individuals tracking work hours, travel time, or daily errands who require specialized time-based arithmetic. - **Platforms:** iOS & Android - **Version Reviewed:** 1.1.5 - **Report Date:** 2026-09-16 - **Signal Count:** 50 reviews analyzed - **Confidence:** High (0.8/1.0) - **App Store ID (iOS):** 1554799802 - **Bundle ID:** com.kdevelop.TimeCalc - **Google Play ID:** com.kdevelop.TimeCalc - **Data Window:** Analysis based on signals collected up to 2026-09-16 ## Executive Snapshot **What it is:** Time : Calculator++ is a productivity utility for iOS and Android that performs arithmetic on time durations. **Why users hire it:** Users need to calculate irregular work hours and travel times without the manual conversion errors inherent in standard decimal-based calculators. ## App DNA (Features & Intent) - **[Standard] Time-specific Calculator:** Arithmetic operations for hours and minutes with automatic colon insertion. - **[Differentiator] Preset Keys:** User-defined buttons for one-touch addition of frequently used time intervals. - **[Differentiator] 24-Hour Toggle:** Dedicated button for cross-midnight calculations. ## Market Position {#market-position} Time : Calculator++ maintains a 4.6-star rating across 1,853 total ratings, signaling high satisfaction with its core utility. The lack of updates for 113 days suggests a mature product lifecycle focused on ad-revenue maintenance rather than market-share expansion. ## Monetization Strategy - **Model:** Free - **Tiers:** Free with ad support - **Analysis:** Ad-supported model with no IAP or subscription gates, monetizing 500,000+ Android installs via ad inventory. ## 🟢 User Sentiment (High Confidence: 50 of 50 reviews analyzed) {#user-sentiment} - **Overall Rating:** 4.67/5 - **Platform Split:** iOS 4.6/5 (25 ratings) | Android 4.7/5 (1.8K ratings) - **Overall Sentiment:** Excited ### Top Praises - **Time calculation convenience allows users to avoid manual arithmetic when managing fluctuating work schedules** - **Simple and intuitive interface design makes time math accessible for users across various professional roles** - **Versatile support for both twelve and twenty-four hour time formats accommodates diverse scheduling needs** ### Top Complaints (Impact Areas) - **Privacy settings fail to persist user choices, leading to concerns about data handling and vendor tracking** ## SWOT Analysis {#swot} **Core Strengths:** - Preset keys create functional switching costs **Growth Levers:** - 12/24-hour display toggle captures broader audience ## What's New - **Latest (v1.25, 3 months ago):** Routine maintenance update focused on stability. ## App Momentum (Maintenance) {#momentum} - Ships routine maintenance updates. - Last major release 3 months ago. > **Cadence:** 2 total versions · 0 majors in last 6 months · 113 days since last update · 0 days avg between updates ## The "So What?" (Strategic Takeaway) {#so-what} Time : Calculator++ is a market-leading productivity app that is completely free. With a 4.67/5 rating from 1.9K reviews, it delivers strong user satisfaction. > **Bottom Line:** Fixing the privacy-setting persistence would address the primary friction point driving user hesitation, securing the app's position as a reliable utility for its core professional audience. **Best for:** Professionals and individuals tracking work hours, travel time, or daily errands who require specialized time-based arithmetic. ### PM Action Plan (Next Best Moves) - [ ] [INVEST] Fix privacy-setting persistence because users report settings reset after saving → increase user trust ### Outlook: Stable Time : Calculator++ remains a stable utility for time-tracking, but the lack of feature expansion leaves it vulnerable to rivals that offer more flexible time-format displays. The PM should prioritize stability and privacy-setting fixes to maintain the current user base, as the app is not currently positioned for aggressive growth. - 🔴 Privacy settings failing to persist after saving creates a recurring trust barrier that limits potential conversion to paid-ad engagement. - ⚪ The 113-day update gap confirms a maintenance-only lifecycle, which is sufficient for a static utility but prevents competitive differentiation. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Overall Rating | 4.67/5 | | Total Reviews | 1.9K | | Sentiment | Excited (75/100) | | Confidence | High | | Pricing Model | Free | | Platforms | iOS & Android | | Key Features | 3 analyzed | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Time : Calculator++** (this app) | 4.67/5 | Excited | YUTAKA KENJO | | [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 | | [HitWave](https://marlvel.ai/apps/ciendor-applications-hitwave) | 2.6/5 | Mixed | Ciendor Holdings Corp. LTD | | [Paper: Sketch, Draw & Create](https://marlvel.ai/apps/paper-sketch-draw-create) | 4.6/5 | N/A | Evernote Corporation | | [Pattrn - Discipline Tracker](https://marlvel.ai/apps/pattrn-discipline-tracker) | 4.8/5 | Thrilled | Pedro Schott | ## Company Profile - **Developer:** YUTAKA KENJO - **Website:** [https://app.k-server.info/develop/](https://app.k-server.info/develop/) - **Social:** [Facebook](https://www.facebook.com/sharer/sharer.php?u=https) · [X/Twitter](https://twitter.com/intent) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/time-calculator/id1554799802?uo=4) - **Google Play:** [View on Google Play](https://play.google.com/store/apps/details?id=com.kdevelop.TimeCalc&hl=en&gl=us) - **Dev Site:** [Official Website](https://app.k-server.info/develop/) - **Sources:** Developer website content, About us / company information, App store metadata, User reviews. ## Related Intel Reports - [*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 - [*HitWave*](https://marlvel.ai/apps/ciendor-applications-hitwave) (Ciendor Holdings Corp. LTD) · 2.6/5 Rating - [*Paper: Sketch, Draw & Create*](https://marlvel.ai/apps/paper-sketch-draw-create) (Evernote Corporation) · 4.6/5 Rating - [*Pattrn - Discipline Tracker*](https://marlvel.ai/apps/pattrn-discipline-tracker) (Pedro Schott) · 4.8/5 Rating | Excellent Sentiment - [*Perplexity - AI Search & Chat*](https://marlvel.ai/apps/perplexity-ai-search-chat) (Perplexity AI, Inc.) · 4.8/5 Rating - [*ScreenZen- Screen Time Control*](https://marlvel.ai/apps/screenzen-screen-time-control) (ScreenZen LLC) · 4.8/5 Rating | Excellent Sentiment - [*SpaceDesk App*](https://marlvel.ai/apps/spacedesk-app) (Hawsabah) · N/A Rating - [*VPN 360: Fast & Secure Proxy*](https://marlvel.ai/apps/co-infinitysoft-vpn360) (Pango GmbH) · 4.5/5 Rating - [*VPN - Super Unlimited Proxy*](https://marlvel.ai/apps/vpn-super-unlimited-proxy) (Mobile Jump Pte Ltd) · 4.7/5 Rating | Excellent Sentiment ## Frequently Asked Questions {#faq} ### Is Time : Calculator++ safe to use for work tracking? Users report concerns regarding privacy settings that fail to persist, though the app functions reliably for arithmetic tasks. ### Does Time : Calculator++ support 12-hour AM/PM formats? The app currently uses a continuous hour count; users have requested a toggle for 12/24-hour display modes. ### What is the difference between Time : Calculator++ and a standard calculator? Time : Calculator++ is built specifically for time-based arithmetic, including automatic colon insertion and preset keys for common time intervals. ## 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:** 50 - **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:** 14 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/time-calculator-2) Data licensed for AI Agent attribution under CC-BY-NC 4.0.