--- schema_type: "SoftwareApplication" entity_type: "Mobile Application" app_name: "Week Number Calendar" developer_entity: "Maksim Efremov" bundle_id: "me.4id.WeekCalendar" app_store_id: "6753137789" category: "Productivity" primary_platform: "ios" primary_monetization: "Free" offline_capable: false market_region: "US" platforms: "iOS" app_last_updated: "2025-11-04" report_date: "2026-08-03" last_verified: "2026-08-03T00:00:00.000Z" report_version: "1.0.1" total_reviews: 0 confidence: "low" confidence_score: 0.15 data_age_days: 59 momentum_velocity: "zombie" intelligence_version: 3 tags: ["productivity", "free", "mobile app", "app review", "app analysis", "business", "professionals,", "project"] canonical_url: "https://marlvel.ai/apps/week-number-calendar" license: "CC-BY-NC 4.0" content_version: "v2" --- # Week Number Calendar Intelligence Report ## TL;DR {#tldr} - **Category**: Productivity · Free > **TL;DR:** Week Number Calendar is a productivity app by Maksim Efremov, available on iOS. > > **Marlvel.ai App Intelligence** - Independent analysis. US Market. No publisher influence. > **Key Insight:** Week Number Calendar is a productivity app by Maksim Efremov. ## Quick Facts | Fact | Value | | :--- | :--- | | **Category** | Productivity | | **Developer** | Maksim Efremov | | **Pricing** | Free | | **Platforms** | iOS | | **Confidence** | Low (0.15/1.0) | | **Data Age** | 59d | ## Metadata & Market Performance - **Publisher:** Maksim Efremov - **Category:** Productivity - **Target Audience:** Business professionals, project managers, and logistics planners requiring standardized ISO 8601 week references for scheduling. - **Platforms:** iOS - **Version Reviewed:** 1.0.1 - **Report Date:** 2026-08-03 - **Signal Count:** 0 reviews analyzed - **Confidence:** Low (0.15/1.0) - **App Store ID (iOS):** 6753137789 - **Bundle ID:** me.4id.WeekCalendar - **Performance Trend:** Stable - **Data Window:** Analysis based on signals collected up to 2026-08-03 ## Executive Snapshot **What it is:** Week Number Calendar is a productivity utility for iOS that displays ISO 8601 week numbers for business planning. **Why users hire it:** It removes the cognitive friction of calculating standardized week counts for project timelines, displacing manual calendar lookups. ## App DNA (Features & Intent) - **[Standard] ISO 8601 Calendar View:** Displays full-year calendars with standardized week numbering, including support for 52 or 53-week years. - **[Standard] Multi-year Navigation:** Allows users to toggle between different years to view historical or future week numbering. ## Market Position {#market-position} Week Number Calendar serves a niche productivity segment with a zero-cost, single-purpose utility. The lack of recent updates suggests a static market position that does not actively compete for chart share against multi-feature calendar rivals. ## Monetization Strategy - **Model:** Free - **Tiers:** Free - **Analysis:** The app is distributed as a free utility with no visible in-app purchases or subscription tiers. ## SWOT Analysis {#swot} **Core Strengths:** - Minimalist design reduces cognitive load for project managers requiring precise ISO 8601 week references **Growth Levers:** - Integrating export functionality for project milestones could transition the app into a workflow utility ## Recent Changes (v2 → v3) {#recent-changes} Strategic focus has transitioned from exploring growth opportunities to a defensive maintenance posture. The developer now explicitly identifies OS-level feature parity as the primary threat to the app's viability. **Overall trend**: Stable **Compared at**: 2026-08-03 ### High-impact changes - **[Shifted] Defensive Strategic Outlook** (positioning) ### Medium-impact changes - **[Removed] Feature List Pruning** (features) - **[Shifted] Threat Landscape Refinement** (swot) ## What's New - **Latest (v1.0.1, 9 months ago):** Expanded localization with the addition of Russian language support. ## App Momentum (Zombie) {#momentum} - Ships no updates for nine months. - Maintains maintenance-only status since November 2025. > **Cadence:** 1 total versions · 0 majors in last 6 months · 272 days since last update ## The "So What?" (Strategic Takeaway) {#so-what} Week Number Calendar is a productivity app that is completely free. > **Bottom Line:** Maintaining the current utility-first focus is viable only if the app remains a zero-maintenance asset, as the lack of active development prevents it from capturing higher-value workflow segments that require integration with project management platforms. **Best for:** Business professionals, project managers, and logistics planners requiring standardized ISO 8601 week references for scheduling. ### PM Action Plan (Next Best Moves) - [ ] [MAINTAIN] Audit OS-level calendar feature parity because native ISO 8601 support threatens the core utility → inform long-term viability ### Outlook: Stable The market for single-purpose productivity utilities is consolidating around OS-native features, leaving niche apps like Week Number Calendar in a stable but stagnant position. Without feature expansion, the app will likely retain its current user base but fail to grow its footprint. - ⚪ The nine-month development gap confirms the app is in maintenance mode, which limits churn but prevents new user acquisition growth. ## Key Metrics Summary | Metric | Value | | :--- | :--- | | Total Reviews | 0 | | Confidence | Low | | Pricing Model | Free | | Platforms | iOS | | Key Features | 2 analyzed | | Trend | Stable | | Outlook | Stable | ## Competitor Comparison | App | Rating | Sentiment | Developer | | :--- | :--- | :--- | :--- | | **Week Number Calendar** (this app) | N/A/5 | N/A | Maksim Efremov | | [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. | | [바로메모 - 매일 바로 작성하는 메모장](https://marlvel.ai/apps/cswpd-memo) | N/A/5 | N/A | SuWon Choi | ## Company Profile - **Developer:** Maksim Efremov - **Website:** [https://en-us.week.4id.me/](https://en-us.week.4id.me/) ## Data Sources & Links - **App Store:** [View on Apple Store](https://apps.apple.com/us/app/week-number-calendar/id6753137789?uo=4) - **Dev Site:** [Official Website](https://en-us.week.4id.me/) - **Sources:** Developer website content, App store metadata. ## 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 - [*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 - [*プレゼンテーションなど タイマー*](https://marlvel.ai/apps/app--366) (MAKOTO SASAKI) · N/A Rating ## Frequently Asked Questions {#faq} ### Is Week Number Calendar free to use? Yes, the app is distributed as a free utility with no in-app purchases or subscription tiers. ### Does this app support ISO 8601 standards? Yes, the app is specifically designed to display ISO 8601 week numbers, including support for 52 or 53-week years. ### Is this app suitable for project management? The app is designed for business planning and project management, as it provides standardized week references for international team coordination. ## 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:** 0.15/1.0 (based on review volume, data source diversity, and signal quality) - **Reviews Analyzed:** 0 - **Data Sources:** 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:** 59 days since last refresh --- © 2026 Marlvel.ai | [Canonical Report](https://marlvel.ai/apps/week-number-calendar) Data licensed for AI Agent attribution under CC-BY-NC 4.0.