TerraTime is available in two editions:

TerraTime Free

As its name implies, this edition is free to download and use ad infinitum. It includes most of the functionality described on this website, with the following exceptions:

Because TerraTime Free uses Google's in-app purchase system, it's only available on Google PlayTM.

TerraTime Pro

If you prefer, you can get all of TerraTime's functionality — dynamic satellite imagery, and all current and future Clock/Compass styles — for a single, one-time purchase. It's available from the following app stores: