# Onetime. vs World Time Clock Master

The clearest difference is rating: World Time Clock Master at 4.6 against Onetime.'s 3.5. World Time Clock Master also leads on update cadence (fortnightly vs every 11 months) and ratings volume (816 vs 39). Onetime.'s advantage is in-app purchases (none vs 13) and iOS requirement (13.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. World Time Clock Master sells 10 in-app purchases, starting at $2.99 per month. Onetime. asks for nothing beyond the download.

World Time Clock Master holds the better App Store score, 4.6 against 3.5. That said, the two scores are not equally well evidenced: World Time Clock Master has 816 ratings behind it against 39, so its average is the more settled of the two. Written reviews point the same way: 51% of Onetime.'s written reviews are positive against 66% of World Time Clock Master's.

Onetime. ships an update every 11 months, World Time Clock Master fortnightly. The most recent releases landed on September 17, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Onetime. | World Time Clock Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (39 ratings)](https://appshunter.io/ios/app/onetime/id921569664/reviews) | **[4.6 (816 ratings)](https://appshunter.io/ios/app/world-time-clock-master/id6448859727/reviews)** |
| Number of ratings | 39 | **816** |
| Positive reviews | 51.5% of reviews | **65.8% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Fortnightly** |
| Monetization | **Free** | Subscription |
| Size | 2 MB | 236 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [FLUID Design GmbH](https://appshunter.io/developer/921569663) | [Alex Komarov Inc.](https://appshunter.io/developer/364741805) |

## What reviewers say

### 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


### World Time Clock Master

[App page](https://appshunter.io/ios/app/world-time-clock-master/id6448859727)

Effortlessly manage multiple time zones with this app. Convert times instantly, schedule events, and view global clocks at a glance with interactive widgets. Features atomic accuracy and a vast database of locations.

**Highlights:** Multiple time zone display, Interactive time conversion, Event scheduling, Atomic time accuracy, Dynamic home screen widgets, List mode for text view, Real moon phases and sunrise/sunset

**Features:** Family Sharing

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month | $2.99 | per month |
| 3 months | $3.99 | per 3 months |
| 1 year | $11.99 | per year |
| 1 year | $11.99 | per year |
| 1 year | $11.99 | per year |
| 1 year | $19.99 | per year |
| Lifetime | $29.99 | one-time |
| Lifetime | $49.99 | one-time |
| Lifetime | $79.99 | one-time |
| Lifetime | $99.99 | one-time |

**What reviewers like**

- 🚀 Delightful scheduling assistance
- 👍 Feature improvement
- 👍 The best Timezone helper
- 👍 One of the best clocks around
- 👍 The Widget is so damn cool!

**What reviewers complain about**

- 🐛 Problemas al actualizar
- 🐛 Sticky signup interface
- 🐛 Demo not enough
- 🔒 NOT A FREE APP
- 💰 Terrible monetisation model compared to previous app

**Reported bugs**

- Lose all the registered locations after updating the app
- Sticky signup interface
- Widget doesn't work
- GMT and London currently have a 1 hour time difference between the two locations, but the app shows them the same time

**Requested features**

- Add the time difference in hours between the default location and other locations in both the widget and the app
- See my calendar events on the dial
- Make a paid tier that doesn't collect my data
- Add new event to a Calendar


## Frequently asked questions

### Is Onetime. free?

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

### Is World Time Clock Master free?

World Time Clock Master is free to download, with in-app purchases available.

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

World Time Clock Master is rated higher. Onetime. averages 3.5 out of 5 from 39 ratings, while World Time Clock Master averages 4.6 from 816 ratings.

### Do Onetime. or World Time Clock Master have ads?

Neither Onetime. nor World Time Clock Master shows ads.

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

Onetime. ships an update every 11 months, and World Time Clock Master fortnightly. Most recently, Onetime. was updated on September 17, 2026 and World Time Clock Master on September 25, 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.*