# World Timezone Calendar vs Stratum 9

The clearest difference is in-app purchases: Stratum 9 at none against World Timezone Calendar's 1. Stratum 9 also leads on ads (none vs shown) and update cadence (every 5 weeks vs every 4 months). World Timezone Calendar's advantage is ratings volume (314 vs 2) and device support (4 vs 2). On price and rating there is nothing between them.

Both are free to download. World Timezone Calendar sells 1 one-off in-app purchase. Stratum 9 asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for World Timezone Calendar against 5.0 for Stratum 9. That said, the two scores are not equally well evidenced: World Timezone Calendar has 314 ratings behind it against 2, so its average is the more settled of the two.

World Timezone Calendar ships an update every 4 months, Stratum 9 every 5 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | World Timezone Calendar | Stratum 9 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (314 ratings)](https://appshunter.io/ios/app/world-timezone-calendar/id792552743/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/stratum-9/id6478380143/reviews)** |
| Number of ratings | **314** | 2 |
| Positive reviews | 76.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 19 MB | 35 MB |
| Requires iOS | 16.6 | **13.4** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Geospike Pty Ltd](https://appshunter.io/developer/500622151) | [9th Stratum Publishing LLC](https://appshunter.io/developer/1732644918) |

## What reviewers say

### World Timezone Calendar

[App page](https://appshunter.io/ios/app/world-timezone-calendar/id792552743)

Easily schedule meetings and events across different time zones. This app helps you find the perfect time for global coordination by comparing multiple time zones and integrating with your existing calendar. Plan ahead with future time views and share events that automatically adjust to recipients' local times.

**Highlights:** Cross-timezone scheduling, View calendar in multiple timezones, Time travel to plan ahead, Add unlimited timezones, Day/night indicators, Home screen widget, Global event sharing

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Advertising | $19.95 | one-time |

**What reviewers like**

- 👍 Easy to use
- 🌍 Great for multiple time zones
- 💡 Simple and efficient
- ✅ Clear display
- 🤝 Helpful for international scheduling

**What reviewers complain about**

- 💰 Expensive ad-free version
- 🔞 Inappropriate ads in free version
- 💸 High price for functionality

**Reported bugs**

- 🐛 Inappropriate ads in free version
- 🐛 Widget settings not saved
- 🐛 Cannot add new events with double tap
- 🐛 Timezone abbreviations not displayed
- 🐛 Search feature doesn't work

**Requested features**

- Add more cities
- Option to freeze time zones for comparison
- Switch between 24-hour and AM/PM clock
- Cleaner design with better calendar event integration
- Ability to pick a specific date to view


### Stratum 9

[App page](https://appshunter.io/ios/app/stratum-9/id6478380143)

This app provides a science-backed framework for achieving and sustaining elite performance. It offers self-assessment tools, personalized development plans, practical strategies, and goal-setting tools to help users improve across all areas of life.

**Highlights:** Self-Assessment Tools, Customized Skill Development Plans, Performance Library (TacApps), DOIT Goal Strategy, Daily Challenges & Progress Tracking, Community and Peer Support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is World Timezone Calendar free?

World Timezone Calendar is free to download, with in-app purchases available.

### Is Stratum 9 free?

Stratum 9 is free to download, with no in-app purchases.

### Which has better reviews, World Timezone Calendar or Stratum 9?

Stratum 9 is rated higher. World Timezone Calendar averages 4.9 out of 5 from 314 ratings, while Stratum 9 averages 5.0 from 2 ratings.

### Do World Timezone Calendar or Stratum 9 have ads?

World Timezone Calendar shows ads; Stratum 9 does not.

### Which is updated more often, World Timezone Calendar or Stratum 9?

World Timezone Calendar ships an update every 4 months, and Stratum 9 every 5 weeks. Most recently, World Timezone Calendar was updated on October 24, 2026 and Stratum 9 on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*