# Book'u Timer vs ZoneFlow

The clearest difference is in-app purchases: Book'u Timer at none against ZoneFlow's 2. Book'u Timer also leads on ads (none vs shown) and device support (3 vs 1). ZoneFlow's advantage is update cadence (every 3 days vs every 2 months). On price there is nothing between them.

Both are free to download. ZoneFlow sells 2 in-app purchases, starting at $2.99 per month. Book'u Timer asks for nothing beyond the download.

Book'u Timer ships an update every 2 months, ZoneFlow every 3 days. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Book'u Timer | ZoneFlow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 3 days** |
| Size | 51 MB | 19 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Smalltalk bvba](https://appshunter.io/developer/1367949944) | [Benji Mandel](https://appshunter.io/developer/1520446400) |

## What reviewers say

### Book'u Timer

[App page](https://appshunter.io/ios/app/booku-timer/id1457036284)

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

**In-app purchases:** none


### ZoneFlow

[App page](https://appshunter.io/ios/app/zoneflow-auto-timezone/id6777122376)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ZoneFlow Pro Monthly | $2.99 | per month |
| ZoneFlow Pro Yearly | $14.99 | per year |


## Frequently asked questions

### Is Book'u Timer free?

Book'u Timer is free to download, with no in-app purchases.

### Is ZoneFlow free?

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

### Do Book'u Timer or ZoneFlow have ads?

ZoneFlow shows ads; Book'u Timer does not.

### Which is updated more often, Book'u Timer or ZoneFlow?

Book'u Timer ships an update every 2 months, and ZoneFlow every 3 days. Most recently, Book'u Timer was updated on November 2, 2026 and ZoneFlow on November 5, 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.*