What features does the Pro version contain?

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Cloud sync
Excel- & CSV export
Unlimited amount of tasks
Start/stop/pause notifications
Workplace arrival & departure detection (Android & iOS)
+ more! (e.g. overlay window on Windows, widget on Android)

After installing the app, there will be a 7-day trial period in which you can test all Pro features before they are being disabled unless you purchase the Pro version.

Is the Pro version a subscription?

No, the standard Pro version is a durable one-time purchase - no subscription. WorkingHours on Windows and Android also offer an option of a 30 day Pro version for a smaller fee. On Android, this is has been implemented as a subscription (that you can cancel any time). On Windows, the 30 day Pro version does not renew automatically.

Do I need to buy the Pro version for each device separately?

The Pro version license is bound to the respective App Store account (e.g. on Windows: your Microsoft account). That allows you to use the same license on multiple devices of the same platform (e.g. Windows) - given you use the same account on all those devices. Because different platforms are using different App Stores (Windows: Windows Store, Android: Google Play Store), you need to buy the Pro version separately for each platform if you want to use the cross-platform Cloud sync. This also applies to the iOS & macOS versions, even though they can be both downloaded with the same Apple account. That means that the macOS Pro version can only be used on macOS (Desktop) and the iOS Pro version can only be used on iOS (iPhone & iPad).

Why do I need to buy the Pro version for each platform separately?
In order for one license to work for all platforms, I would have to implement my own licensing system, instead of using the licensing system provided by Microsoft, Google & Apple. This not only takes up time that I would rather use to improve the app and build new features, it would also cause additional costs which in turn could impact the price of the app - even for those who only want to use the app on one single device. Also, users would need to create a WorkingHours account that the licenses can be synced with, which is something I would want to avoid: WorkingHours should be as easy to use as possible, without having to worry about accounts, logins or signups. All these reasons brought me to the conclusion that a unified license (pay once, use on all platforms) would not have enough benefits to outweigh the drawbacks. I am always open to discuss alternatives, so if you think there's something to improve, please reach out to me.

How to restore the Pro version on a new device?

As described above, the Pro version needs to be purchased only once per platform. In case the Pro version does not automatically activate after switching the device and using the same App Store account, then re-initiating the purchasing process can trigger the download of the license (no worries - it is not possible to buy the Pro version twice with the same account). Additionally, in the iOS & macOS versions, there is a "Restore purchases" button on the "Pro version" page.
If this doesn't work, it is also recommended to reset the App Store Cache (Windows / Android).

[Android] Restoring the Pro version with multiple Google accounts
On Android it is possible to have multiple active Google accounts on the device. In this case it is important that WorkingHours was downloaded with the correct Google account when restoring the Pro version. To ensure this is the case, you can create a database backup in the app settings. Then uninstall WorkingHours and before reinstalling it, make sure the correct Google account is selected as primary account (button on the top right in the Play Store app).

[Android] I bought the Pro version before, why is it gone again?
If you previously bought the Pro version on Android but the app falls back to the free version, this might be due to the Play Store (perhaps mistakenly) reporting to WorkingHours that no Pro version license is present in the currently active Google account. Please make sure you are logged in to the Play Store app with the same Google account that you bought the app previously. You can also try to restart the purchasing process - it is not possible to get charged for the Pro version twice on the same Google account. So if you are logged in with the correct account, this will result in Google Play recognizing the Pro version has already been bought and WorkingHours will enable it again.

[Windows] I can't purchase the Pro version

If you are having problems while purchasing the Pro version and Windows asks you to add a profile/address of another country than the one you are living in, please make sure the region and language of your PC are correctly set in the system settings.
In some cases you may also need to reset the Microsoft Store Cache as described here.
You can also purchase the Pro version outside the Microsoft Store and without the need of a Microsoft account here.