# Onetime. vs Zen World Time Converter

The clearest difference is rating: Zen World Time Converter at 4.6 against Onetime.'s 3.3. Zen World Time Converter also leads on review sentiment (88% vs 51%) and update cadence (every 2 months vs every 11 months). Onetime.'s advantage is in-app purchases (none vs 1). On price, ads and device support there is nothing between them.

Both are free to download. Zen World Time Converter sells 1 one-off in-app purchase. Onetime. asks for nothing beyond the download.

Zen World Time Converter holds the better App Store score, 4.6 against 3.3. Both are backed by a comparable volume of ratings — 42 and 189 respectively. Written reviews point the same way: 51% of Onetime.'s written reviews are positive against 88% of Zen World Time Converter's.

Onetime. ships an update every 11 months, Zen World Time Converter every 2 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Onetime. | Zen World Time Converter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (42 ratings)](https://appshunter.io/ios/app/onetime/id921569664/reviews) | **[4.6 (189 ratings)](https://appshunter.io/ios/app/zen-world-time-converter/id1467876592/reviews)** |
| Number of ratings | 42 | **189** |
| Positive reviews | 51.5% of reviews | **88.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 2 months** |
| Monetization | **Free** | Freemium |
| Size | 2 MB | 18 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FLUID Design GmbH](https://appshunter.io/developer/921569663) | [Vlad Paraschiv](https://appshunter.io/developer/1397312861) |

## 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


### Zen World Time Converter

[App page](https://appshunter.io/ios/app/zen-world-time-converter/id1467876592)

Easily find the current time in any location worldwide. This app simplifies scheduling calls across different time zones with an intuitive slider for quick time adjustments. It offers extensive location data and clear visual differentiation of day and night hours.

**Highlights:** Global time zone conversion, Over 22,000 locations, Customizable daylight hours, Intuitive time slider, Clear day/night differentiation, Ad-free experience

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zen World Time Pro Features | $5.99 | one-time |

**What reviewers like**

- 👍 Simple and intuitive user interface
- 🎨 Clean, elegant, and visually appealing design
- ⚡ Easy to use for quick time zone comparisons
- 🌍 Supports multiple cities simultaneously
- 🔄 Smooth slider functionality for time adjustments

**What reviewers complain about**

- 🐛 Incorrect time zone data for some locations
- 📱 Not optimized for iPad (iPhone-only formatting)
- 🔒 Limited free version (only 2 cities)
- 📊 Limited time range (only 7 days ahead)
- 🎚️ Excessive scrolling needed to view all cities

**Reported bugs**

- Time doesn't auto-update after app launch
- Red button to snap back to current time shows outdated time
- Incorrect time zone placement (St. Barthélemy in French Alps instead of Caribbean)
- Calendar functionality not working as expected
- Sunrise/sunset can only be set in 30-minute increments

**Requested features**

- 24-hour time format option
- Ability to rearrange cities by drag-and-drop
- Alphabetical or custom sorting of city list
- Customizable font colors per city
- Custom city names (e.g., 'Grandma', 'Corporate')


## Frequently asked questions

### Is Onetime. free?

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

### Is Zen World Time Converter free?

Zen World Time Converter is free to download, with in-app purchases available.

### Which has better reviews, Onetime. or Zen World Time Converter?

Zen World Time Converter is rated higher. Onetime. averages 3.3 out of 5 from 42 ratings, while Zen World Time Converter averages 4.6 from 189 ratings.

### Do Onetime. or Zen World Time Converter have ads?

Neither Onetime. nor Zen World Time Converter shows ads.

### Which is updated more often, Onetime. or Zen World Time Converter?

Onetime. ships an update every 11 months, and Zen World Time Converter every 2 months. Most recently, Onetime. was updated on October 24, 2026 and Zen World Time Converter on October 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.*