There are hundreds of Tumblr-compatible applications and websites. Some of them require extra permission to create posts or access features like your Dashboard, your likes, and who you’re following. Should this be the case, you'll be prompted to "Grant this application access” when you connect it to your Tumblr account.
Permission will either be for read and write or read access. Read and write access permits the application or website to create and edit posts for you.
You can revoke access at any time from your apps settings. Since we didn't build (and don't have access to) these applications, we cannot provide support for them, and you should only grant permission to apps you trust. Please contact their creators with any support inquiries.