Ravelgurumi does not collect or store any user information in the app, or pass on to third parties. Anonymous usage data is collected to help fix crashes and bugs and to determine which screens are most popular, so that we can make the app better in future versions.
The app allows you to access patterns on Ravelry via the Ravelry API, authorizing using their Ravelry account, via standard Oauth 2.0 mechanism. Ravelry’s privacy policy can be found here
We have no affiliation with Ravelry. We do like their site however 🙂