Week Number Calendar is a productivity utility for iOS that displays ISO 8601 week numbers for business planning.
The App DNA
What makes this app unique?
It removes the cognitive friction of calculating standardized week counts for project timelines, displacing manual calendar lookups.
For Business professionals, project managers, and logistics planners requiring standardized ISO 8601 week references for scheduling.
Key features
Displays full-year calendars with standardized week numbering, including support for 52 or 53-week years.
Allows users to toggle between different years to view historical or future week numbering.
How much does it cost?
The app is distributed as a free utility with no visible in-app purchases or subscription tiers.
Velocity
Dormant developmentinternationalizationShow more...
Development has ceased, with no updates shipped in the last 272 days. The app remains in a zombie state, as the last recorded release was over nine months ago. There is no evidence of ongoing maintenance or feature development.
Who built it?
User Sentiment
What do users think recently?
How are ratings & reviews evolving?
Not enough recent reviews to extract reliable themes yet.
Read the full review analysisCompetition
Competitive landscape for Week Number Calendar
How's the Productivity market?
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.
Read the market outlookThe rivals identified
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Access the full report for freeThe Analyst's Read
Key takeaways for Week Number Calendar
Where is it heading?
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.
The SWOT
- Minimalist design reduces cognitive load for project managers requiring precise ISO 8601 week references
- Integrating export functionality for project milestones could transition the app into a workflow utility
Next best moves
Audit OS-level calendar feature parity because native ISO 8601 support threatens the core utility → inform long-term viability
The counter-intuitive read
The app's nine-month dormancy is a feature, not a bug…
Read the full takeSince the last report: 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.
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.
Unlock 1 critical friction, 1 market threat and the analyst’s take.
Access the full report for freeFAQ
Is Week Number Calendar free to use?
Does this app support ISO 8601 standards?
Is this app suitable for project management?
Sources
Report last updated