The main Silhouette Studio is free and can be downloaded as well as used in-browser. Upgrades for machines and the software are free. There is a Silhouette subscription service, similar to Cricut Access, that offers more designs and projects.
Silhouette has also recently released software for mobiles with Silhouette Go and Silhouette Mint is the bespoke app for the stamp machine. Silhouette Connect is a new plug-in that enables connectivity to CorelDraw and Adobe Illustrator, and its free.