# ZoneSync Pro vs DeltaClock

The clearest difference is in-app purchases: ZoneSync Pro at none against DeltaClock's 3. ZoneSync Pro also leads on iOS requirement (15.1 vs 18.0). DeltaClock's advantage is update cadence (every 4 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. DeltaClock sells 3 in-app purchases, starting at $1.99 per month. ZoneSync Pro asks for nothing beyond the download.

ZoneSync Pro ships an update every 3 weeks, DeltaClock every 4 days. The most recent releases landed on September 9, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | ZoneSync Pro | DeltaClock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Size | 45 MB | 24 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [INVOLUTION CONSULTING PTY LTD](https://appshunter.io/developer/1546377205) | [Ameliia Shekikhacheva](https://appshunter.io/developer/1833150935) |

## What reviewers say

### ZoneSync Pro

[App page](https://appshunter.io/ios/app/zonesync-pro/id6747392976)

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

**In-app purchases:** none


### DeltaClock

[App page](https://appshunter.io/ios/app/deltaclock-time-zone-planner/id6751021160)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Subscription Monthly | $1.99 | per month |
| Pro Subscription Annual | $9.99 | per year |
| Lifetime purchase | $24.99 | one-time |


## Frequently asked questions

### Is ZoneSync Pro free?

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

### Is DeltaClock free?

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

### Do ZoneSync Pro or DeltaClock have ads?

Neither ZoneSync Pro nor DeltaClock shows ads.

### Which is updated more often, ZoneSync Pro or DeltaClock?

ZoneSync Pro ships an update every 3 weeks, and DeltaClock every 4 days. Most recently, ZoneSync Pro was updated on September 9, 2026 and DeltaClock on September 8, 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.*