Gemnasium vs Tidelift: What are the differences?
Developers describe Gemnasium as "Parses your project's dependencies and notifies you when new versions are released or they need to be updated". Gemnasium keeps track of projects dependencies. Ruby, Node.js, PHP composer, Bower and Python projects dependencies are automatically parsed, and notifications sent when new versions are released or security advisories are published. On the other hand, Tidelift is detailed as "Managed open source—backed by maintainers". Automatic compliance testing for all of the dependencies in your application.
Gemnasium and Tidelift can be primarily classified as "Dependency Monitoring" tools.