# Sleep When I Sleep vs Time Zone Pro

The clearest difference is review sentiment: Time Zone Pro at 77% against Sleep When I Sleep's 0%. Time Zone Pro also leads on rating (4.9 vs 1.0) and in-app purchases (none vs 1). Sleep When I Sleep's advantage is price (Free vs $2.99) and iOS requirement (11.1 vs 14.0). On update cadence, ads and device support there is nothing between them.

Sleep When I Sleep is free to download; Time Zone Pro costs $2.99 up front. Sleep When I Sleep sells 1 in-app purchase, starting at $5.49 per year. Time Zone Pro asks for nothing beyond the download.

Time Zone Pro holds the better App Store score, 4.9 against 1.0. That said, the two scores are not equally well evidenced: Time Zone Pro has 29 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 0% of Sleep When I Sleep's written reviews are positive against 77% of Time Zone Pro's.

Sleep When I Sleep ships an update every 4 months, Time Zone Pro every 3 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Sleep When I Sleep | Time Zone Pro |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/sleep-when-i-sleep/id1473060489/reviews) | **[4.9 (29 ratings)](https://appshunter.io/ios/app/time-zone-pro/id1557558517/reviews)** |
| Number of ratings | 2 | **29** |
| Positive reviews | 0.0% of reviews | **77.3% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 35 MB | 14 MB |
| Requires iOS | **11.1** | 14.0 |
| Devices | iPhone, iPod, Apple Watch | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [SWIS APP LTD](https://appshunter.io/developer/1473060488) | [Friendly Studio](https://appshunter.io/developer/1557558519) |

## What reviewers say

### Sleep When I Sleep

[App page](https://appshunter.io/ios/app/sleep-when-i-sleep/id1473060489)

This app alerts you when you're falling asleep while listening to audiobooks or podcasts. It pauses playback to help you easily find your place again. It utilizes Apple Watch health data to detect sleep and offers a reset function for continued use.

**Highlights:** Sleep detection alerts, Automatic audio playback pause, Apple Watch integration, Adjustable sensitivity, Easy start/stop functionality

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7 Day Free Trial | $5.49 | per year |


### Time Zone Pro

[App page](https://appshunter.io/ios/app/time-zone-pro/id1557558517)

Easily track the time zones of your contacts worldwide. Avoid scheduling conflicts by seeing when your friends, family, or colleagues are awake and available. Organize contacts into groups and sync across your Apple devices.

**Highlights:** Time scrubbing, Contact groups, Cross-device sync (iOS/macOS), Automatic time zone detection, Home screen widgets, Night time indicator, Time zone map

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sleep When I Sleep free?

Sleep When I Sleep is free to download, with in-app purchases available.

### Is Time Zone Pro free?

Time Zone Pro costs $2.99, with no in-app purchases.

### Which has better reviews, Sleep When I Sleep or Time Zone Pro?

Time Zone Pro is rated higher. Sleep When I Sleep averages 1.0 out of 5 from 2 ratings, while Time Zone Pro averages 4.9 from 29 ratings.

### Do Sleep When I Sleep or Time Zone Pro have ads?

Neither Sleep When I Sleep nor Time Zone Pro shows ads.

### Which is updated more often, Sleep When I Sleep or Time Zone Pro?

Sleep When I Sleep ships an update every 4 months, and Time Zone Pro every 3 months. Most recently, Sleep When I Sleep was updated on November 3, 2026 and Time Zone Pro on November 3, 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.*