Report updated May 17, 2026
Week Number
For professionals and individuals who require frequent reference to ISO or Gregorian week numbers for scheduling.
Week Number is a well-regarded utilities app that is completely free. With a 4.9/5 rating from 261 reviews, it maintains solid user satisfaction.
What is Week Number?
Week Number is a utility app for macOS and Android that displays current ISO or Gregorian week numbers via widgets and menu bar items.
Users hire this app to eliminate the manual calculation of week numbers during scheduling, providing a quick reference that standard calendar apps often bury in settings.
Current Momentum
v1.3 · 2mo ago
Active- Ships macOS 26 compatibility update.
- Improved Android widget contrast.
What makes this app unique?
What Does It Look Like?
What Are The Key Features?
Displays the current week number directly in the macOS menu bar
Displays week number on Android home screens with adjustable size, background color, and transparency
How much does it cost?
- Free
The app is distributed as a free utility without IAP or subscription gates.
Who Built It?
Sindre Sorhus
Equipping macOS power users and developers with lightweight, single-purpose utilities to refine their digital workflow.
Portfolio
13
Apps
What other apps does Sindre Sorhus make?
Any Text · Widgets
Aiko
Favorites Widget
Quick Launch
Shareful
Actions
Explore the full Sindre Sorhus report
Portfolio breakdown, audience, momentum, and every app published by Sindre Sorhus.
What do users think recently?
High confidence · Latest 100 of 261 total reviews analyzed
What is the recent mood?
Recent user voice shows a excited sentiment.
View the full user-sentiment analysis
Mood gauge, ratings & review-volume history, every praise / complaint / request, and sentiment over time.
What is the competitive landscape for Week Number?
How's The Utilities Market?
Market outlook for this category
Available very soon
The rivals identified
Nemeses(1)
While functionally distinct, both apps compete for prime real estate on the user's home screen via utility-focused widgets that provide essential, at-a-glance information.
Contenders(4)
Both apps aim to improve device utility through quick-access controls and information displays on the home screen or notification bar.
Competes for the user's attention by providing time-critical information and status updates, albeit within a specialized business workflow.
This app directly competes for the same home screen real estate by offering multi-functional widgets that include calendar data alongside other metrics.
Both apps provide time-sensitive data visualization, though this contender focuses on professional fleet logistics rather than personal calendar management.
Same space(3)
Shares the 'utility' category by providing users with tools to automate and manage specific device functions through external triggers.
Competes for the same visual space on the lock screen and home screen, focusing on quick access and information glanceability.
Targets the same power-user demographic interested in customizing their device experience through advanced widget and shortcut actions.
Compare Week Number against every rival
All rivals in one side-by-side table — identity, store metrics, ratings & sentiment, and strategic intel — plus a head-to-head page for each.
The outtake for Week Number
Strengths to defend, gaps to attack
Core Strengths
- Minimalist design reduces cognitive load for quick date lookups
- Cross-platform widget availability ensures consistent utility access
Critical Frictions
- Zero revenue model limits reinvestment capacity
- Lack of advanced scheduling features restricts user base
Growth Levers
- Integration with third-party calendar APIs could transition the app into an active scheduling tool
Market Threats
- OS-level native calendar updates frequently render single-purpose utilities obsolete
What are the next best moves?
Integrate third-party calendar sync because users require active scheduling, not just passive viewing → increase daily utility frequency.
The app is currently a secondary utility; calendar integration would make it a primary productivity tool.
Trade-off: Deprioritize visual customization updates for the Android widget.
A counter-intuitive read
The app's lack of monetization is its primary risk, as it prevents the development of the advanced features needed to defend against native OS calendar updates.
Feature Gaps vs Competitors
- Natural language event creation (available in Fantastical Calendar but absent here)
- Cross-platform synchronization engine (available in Fantastical Calendar but absent here)
Key Takeaways
Week Number succeeds as a minimalist utility, but its lack of advanced features limits its growth, so the PM should pivot toward calendar integration to increase user retention.
Where Is It Heading?
Stable
The market for single-purpose date utilities is consolidating as OS-level calendar widgets become more capable. Week Number remains stable due to its simplicity, but it must add active scheduling features to avoid being replaced by native system tools.
Recent updates focused on macOS compatibility and widget contrast, indicating the app remains in a maintenance-focused utility lifecycle.