Help when you need it.

No, not for normal use of the full version. After activation, Celestium works without an internet connection. You only need a connection to activate your license, to fetch an upgrade, to deactivate a computer, and for the OpenStreetMap map in Astrocartography and Local Space. Celestium tries to contact our server now and then to renew your license; if that fails, the program keeps working.

The trial checks the date online when it starts. On the tenth start in a row without an internet connection it closes; start it again with a connection and it works again.

After fourteen days the trial stops working. Your data and settings are kept. If you want to keep using Celestium, you can buy a license afterwards.

Yes, on your own devices, for example a desktop and a laptop. How many devices, and what counts as a device, is explained below. If you reach the maximum, Celestium shows this hint when you activate: "To free a slot, open Celestium on one of those devices and deactivate it there, or contact support."

A license is personal and may not be shared by several people.

You activate Celestium online on each device, in the license window. The first time you start Celestium, it opens that window itself; later you find it through File → License... in the menu. You need an internet connection when you activate. A license covers up to three devices. Every user account on a computer counts as a device: if two accounts on the same computer use Celestium, those are two devices. A mobile device also counts as a device. If you reinstall Windows, the computer gets a new identifier and counts as a new device.

After activation, Celestium tries to contact our server now and then to renew your license. If you do not want to wait for that contact, choose "Refresh license" in the license window. If the contact fails, Celestium keeps working, also without an internet connection; the program only sees a revocation at its next contact.

You can free up a device in Celestium on that device itself, with "Deactivate this computer" in the license window. The slot is then free right away, unless devices of the license were already signed off at least two times as often as the maximum number of devices of the license in the last 30 days; the program then says so, and support can help. You can also ask us by email. The slot then becomes free as soon as that device itself next contacts our server, or right away if we link the license to another customer number. If the license is revoked, the device stays until we clean up the devices of the license. If the device is lost or broken, we can free the slot directly: without a separate decision on our part, at most one time per license per 365 days. If we revoke a license, for example after a chargeback, the program only notices at its next contact with our server.

At the top of the license window it says: "Enter the license key (CELE-...) or license code (CELL-...) from your purchase email. A license key is activated online and requires an internet connection; a license code also works offline." After a purchase, enter the license key from your purchase email there; it starts with CELE- and you activate it online. You do not receive a code starting with CELL- with a purchase.

If you activate Celestium on a device while the maximum has already been reached, the window "Celestium: License" shows a list of your devices. If a sign-off by email has been requested for one of those devices and it has not yet contacted our server, it shows "deactivation pending" next to it. Below the list it then says: "The slot becomes available as soon as that device goes online. Open Celestium on that device and choose Refresh license."

Yes. You may use Celestium in lessons, demonstrations and presentations. The license stays personal: everyone using Celestium independently needs a license of their own.

Teaching a larger group and need several licenses? Get in touch with us.

Yes. Celestium Exchange transfers charts from several astrology programs and file formats to Celestium. For data from Astroscoop there is also Celestium Import.

The Discover Celestium page lists the supported formats and programs.

Celestium stores your charts locally on your own computer. You can make backups yourself and keep them somewhere else, for example on an external drive or in your own cloud storage.

Install the full version over the trial. Your existing charts, folders and settings are preserved. The first time you start Celestium, it opens the license window itself; enter the license key from your purchase email there. Later you find the license window through File → License... in the menu.

Yes. You can upgrade to Celestium Pro at any time. You pay only the price difference, and your existing charts, folders and settings are preserved.

Celestium is available in Dutch, English, German and French. You can switch language in the program at any time.