# World Clock Time Zones Pro vs Onetime.

The clearest difference is price: Onetime. at Free against World Clock Time Zones Pro's $3.99. Onetime. also leads on iOS requirement (13.0 vs 18.0). World Clock Time Zones Pro's advantage is review sentiment (94% vs 51%) and rating (4.7 vs 3.5). On ads, in-app purchases, monetization model and device support there is nothing between them.

Onetime. is free to download; World Clock Time Zones Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

World Clock Time Zones Pro holds the better App Store score, 4.7 against 3.5. Both are backed by a comparable volume of ratings — 151 and 39 respectively. Written reviews point the same way: 94% of World Clock Time Zones Pro's written reviews are positive against 51% of Onetime.'s.

World Clock Time Zones Pro ships an update every 3 weeks, Onetime. every 11 months. The most recent releases landed on September 19, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | World Clock Time Zones Pro | Onetime. |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.7 (151 ratings)](https://appshunter.io/ios/app/world-clock-time-zones-pro/id866437742/reviews)** | [3.5 (39 ratings)](https://appshunter.io/ios/app/onetime/id921569664/reviews) |
| Number of ratings | **151** | 39 |
| Positive reviews | **94.1% of reviews** | 51.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 11 months |
| Monetization | Free | Free |
| Size | 19 MB | 2 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [David Richmond](https://appshunter.io/developer/329944573) | [FLUID Design GmbH](https://appshunter.io/developer/921569663) |

## What reviewers say

### World Clock Time Zones Pro

[App page](https://appshunter.io/ios/app/world-clock-time-zones-pro/id866437742)

This intuitive world clock helps you coordinate with people across different time zones. Easily plan meetings, stay connected with loved ones, and manage global teams. It offers a unique visual display and time shifting capabilities for effortless time management.

**Highlights:** Unique intuitive display, Time shifting for time changes, Meeting scheduling, Global team management, Travel time forecasting, Event reminders and notifications

**Features:** macOS Compatibility

**In-app purchases:** none


### Onetime.

[App page](https://appshunter.io/ios/app/onetime/id921569664)

Visualize multiple world time zones on a single, intuitive dial. This app simplifies international scheduling and communication by displaying cities as they move through day and night, automatically handling daylight saving changes. Effortlessly find the perfect time for calls or to connect with loved ones globally.

**Highlights:** Single, easy-to-read time zone dial, Visualizes cities moving through day and night, Automatic daylight saving time adjustments, Timetravel™ feature for scheduling, Shareable time invites

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- ✨ Beautiful and elegant design
- 👍 Intuitive and easy to use interface
- 🌍 Great for visualizing time differences
- 💡 Unique and innovative visualization
- ✅ Works well for scheduling

**What reviewers complain about**

- 🐛 Data quality issues (incorrect times)
- 🐛 Inability to add cities
- 🐛 App crashes or freezes
- 🐛 City search not working
- 🐛 Some cities not recognized

**Reported bugs**

- Incorrect time zone data for some cities (e.g., Taipei, São Paulo)
- App freezes when trying to add cities
- City search function not working ('No cities found')
- App crashes on launch after updates
- Time travel feature stops working with certain cities

**Requested features**

- Ability to add descriptive labels for cities
- Ability to add GMT/UTC time
- Ability to add time zones manually
- Homescreen widgets
- Ability to toggle cities instead of removing


## Frequently asked questions

### Is World Clock Time Zones Pro free?

World Clock Time Zones Pro costs $3.99, with no in-app purchases.

### Is Onetime. free?

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

### Which has better reviews, World Clock Time Zones Pro or Onetime.?

World Clock Time Zones Pro is rated higher. World Clock Time Zones Pro averages 4.7 out of 5 from 151 ratings, while Onetime. averages 3.5 from 39 ratings.

### Do World Clock Time Zones Pro or Onetime. have ads?

Neither World Clock Time Zones Pro nor Onetime. shows ads.

### Which is updated more often, World Clock Time Zones Pro or Onetime.?

World Clock Time Zones Pro ships an update every 3 weeks, and Onetime. every 11 months. Most recently, World Clock Time Zones Pro was updated on September 19, 2026 and Onetime. on September 17, 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.*