# Time Zone Difference Planner vs ONE WATCH

The clearest difference is update cadence: ONE WATCH at every 3 days against Time Zone Difference Planner's every 4 months. ONE WATCH also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Time Zone Difference Planner sells 3 in-app purchases, starting at $2.99 per 7 days and ONE WATCH sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

Time Zone Difference Planner ships an update every 4 months, ONE WATCH every 3 days. The most recent releases landed on October 31, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Time Zone Difference Planner | ONE WATCH |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 days** |
| Size | 5 MB | 52 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [LEAN ASIA CO., LTD](https://appshunter.io/developer/1815050814) | [Johann Szebeni](https://appshunter.io/developer/1880746405) |

## What reviewers say

### Time Zone Difference Planner

[App page](https://appshunter.io/ios/app/time-zone-difference-planner/id6772262657)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| World Clock Weekly | $2.99 | per 7 days |
| Remote Work Yearly | $14.99 | per year |
| UTC Converter Lifetime | $29.99 | one-time |


### ONE WATCH

[App page](https://appshunter.io/ios/app/one-watch-timezone-clock/id6777670673)

**Features:** Family Sharing, Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $2.99 | per month |
| Premium Yearly | $24.99 | per year |
| Premium Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is Time Zone Difference Planner free?

Time Zone Difference Planner is free to download, with in-app purchases available.

### Is ONE WATCH free?

ONE WATCH is free to download, with in-app purchases available.

### Do Time Zone Difference Planner or ONE WATCH have ads?

Neither Time Zone Difference Planner nor ONE WATCH shows ads.

### Which is updated more often, Time Zone Difference Planner or ONE WATCH?

Time Zone Difference Planner ships an update every 4 months, and ONE WATCH every 3 days. Most recently, Time Zone Difference Planner was updated on October 31, 2026 and ONE WATCH on November 10, 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.*